Q.

Where can I purchase Asymod products?

A.

On this site which is the Asymod home and official site dedicated to wideband AM and eSSB, on www.bxc.mobi and on eBay by eBay member "Myspin". 

Q.

To what PayPal address can I send payment to?

A.

sales@bargainxchange.com

Q.

How can I contact Asymod support if I have any questions?

A.

asyadvice@gmail.com

Q. 

What radios does Asymod IIIs work the best in? 

A.

Few things to consider. The Asymod IIIs works on all solid state high level modulation AM transceivers. The choice is really up to the radio operator. Once the Asymod IIIs is in place most of the transceiver’s factory transmit functions, such as the microphone preamp, transmit audio control, limiters, and modulator sections are disabled and replaced by the Asymod IIIs. Receive functions remain as per factory specs unless the unit is upgraded for Hi-Fi receive.

From the modes of operation point of view, typically an AM only transceiver is best. Multimode transceivers (SSB/AM/FM) require a bit more work but work just as well.

A Galaxy DX-29HP is a great choice as it has dual finals, therefore, only the RF driver transistor is modulated and the dual finals are configured to function as a linear amplifier, this allows for the Asymod IIIs to run much cooler.

Q.

Can you give me a discount?

A.

All prices are lower here at www.asymod.am on all Asymod products, www.asymod.am is the Asymod home and official site dedicated to wideband AM and eSSB. When buying from asymod.am you are buying directly from the manufacturer and is easy. Simply select the item you want and check out via PayPal. All major credit cards are accepted.

Q. 

What type of microphones are you using?

A.

The Asymod equipped transceivers are mostly used in conjunction with some type of audio processing scheme, whether computer based or rack gear... Your choice. The processed audio is fed to the Line-In ¼” TS connector. The recommended microphone is a high quality studio cardioid dynamic microphone. First choice is the Electro Voice RE20, following the lower cost Sure SM7B, SM58 or similar. In the case where audio processing is not possible, and as a last resort, a hand microphone can be used. A dynamic microphone with tone controls, such as the Astatic 575-M6 or similar is recommended, but this somewhat defeats the purpose of the Hi-Fi functionality of the Asymod IIIs. KEEP IN MIND PROCESSED AUDIO GIVES YOU THE PUNCH, DEPTH, QUALITY AND BANDWIDTH THAT MAKE IT STAND OUT FROM THE REST.

To achieve optimum results and to make the most of the Asymod IIIs, an adequate AM audio process chain catered to emphasize on your natural voice is necessary.

Audio processing and a high quality microphone is REQUIRED for optimum performance. Audio processing for mobile operation is possible with the use of the iRig PRE or iRig PRO interface using its companion IK Multimedia's VocalLive Vocal Processor and Recording Studio app on your iOS device. More elaborate and sophisticated detailed third party apps are available that provide more intricate adjustments. Audio processing for base station operation is possible with the use of rack pro-audio processing gear or computer based processing such as ProTools for PC or Mac along with its companion interface such as the Mbox 2 Mini or newer.

Q.

Can you explain modulation percentage in relation to headroom and do you have any Hi-Fi radios that have a variable dead key?

A.

The dead key (carrier level) is adjustable via the Asymod IIIs onboard CAR control. The modulation (LEVEL) and Asymmetry (ASY) controls require readjustment whenever the carrier level (CAR) is changed to maintain the correct modulation envelope pattern. It is possible, upon request to mount these controls externally.

Due to headroom restrictions, the maximum dead key setting is limited by the percentage of modulation desired for a given transceiver. For example, for a single final transceiver such as a stock Cobra 29 (no MOSFET upgrade) which is rated a 16 watts PEP, to achieve 300% modulation the dead key can be no more than 1 watt. Being that the multiplication factor for 300% modulation is 15 (15 times the carrier power), we can say that 15 x 1W = 15W PEP, this leaves us with 1 watt of remaining headroom. The higher the dead key the less room available for the modulation envelope excursion to fully expand itself within the headroom barriers. Any peaks looking to go above 16W PEP will be distortion.

If a higher dead key is needed, say 2 watts, then the maximum modulation percentage is limited and will max out at about 200% on the positive peaks, let’s take a look:

We now know the multiplication factor for 300% modulation is 15 (15 times the carrier power), so we can say that 15 x 2W = 30W PEP, we can see that to achieve 300% modulation with a 2 watt carrier we need a transceiver capable of producing a minimum of 30 watts PEP and clearly a stock Cobra 29 can only produce 16W PEP.

To accommodate the 2 watt carrier, we have to reduce the modulation percentage to be well within the 16W PEP range of the Cobra 29. To do this we look at the Carrier to Peak-Envelope-Power Modulation Percentage Index Chart below where we can see that 200% modulation is 8 times the carrier power. So, 8 x 2W = 16W PEP. We can now see that to accommodate the 2 watt dead key and to stay within the 16 watt range and the headroom limits of the Cobra 29 the modulation had to decrease to 200%.

The level of dead key is inversely proportional as the modulation percentage (AM depth) increases in relation to headroom; the higher the dead key the less headroom is left for the modulation envelope. Refer to the Carrier to Peak-Envelope-Power Modulation Percentage Index Chart (Fig.1) below for more details.

Dual final transceivers such as the Galaxy DX-29HP which is rated at about 40 watts PEP can produce upwards of 200% modulation (8 times the carrier power) even at a 4 watt dead key and still have plenty of headroom left. A 4 watt dead key at 200% modulation can be expressed as 8 x 4W = 32W PEP, this leaves us with a remaining 8 watts of headroom. Remember, every time the dead key (carrier/CAR) level is changed, the modulation (LEVEL) and Asymmetry (ASY) controls have to be readjusted to maintain the correct modulation envelope pattern.

Maximum use of headroom and transmitter performance can be achieved by using the most of the headroom available without pinching at the troughs or clipping at the crests of the modulation envelope. The following Carrier to Peak-Envelope-Power Modulation Percentage Index Chart (Fig.1) provides the ratios to calculate the operating levels for a particular transmitter while staying within the headroom limitations:

Carrier to Peak-Envelope-Power Modulation Percentage Index Chart Fig.1

To solve for the maximum dead key that can be set for a given transmitter, take the Stryker SR-955 HPC which is rated at 60 watts PEP for example, and let’s say 250% modulation is desired. By looking at the chart we can see that 250% modulation is 11 times the carrier power. So, we divide 60 watts by 11, this gives us 5.5 watts of carrier/dead key. We now see that the maximum dead key that can be used to stay within the headroom of 60 watts when modulating at 250% is a 5.5 watt dead key.

In the case where amplifier drive requirements must be met, for example, take the RM Italy HLA 300V Plus. This amplifier input is rated at 2 – 15 W.

To solve for the maximum modulation percentage allowed, and not to exceed, in this case 15W input rating, and to make the most of the amplifiers available headroom useful while sustaining a perfect modulation envelope, we need to solve for allowed carrier/dead key power and maximum modulation percentage possible without pinching at the troughs or clipping at the crests of the modulation envelope. As a starting point, let’s take 200% modulation, which is 8 x the carrier power (W). Next, divide the maximum PEP that the amplifier is able to handle by 8 to arrive at our dead key: 15W PEP/ 8 = 1.87W (round off to 2W). We now see that the maximum modulation level that we can use not to exceed the 15W input rating of the amplifier is 200% modulation with a 2 watt dead key.

Q. (1 – 7 below)

I found your Asymod IIIs modulator board and I'm interested in it but I have some questions that I haven't been able to find in the documentation.

Q1.

None of the Asymod radios have SSB.Will the Asymod IIIs work in an AM/SSB CB Radio?

A1.

There are a few multimode, AM/SSB & AM/SSB/FM radios available such as the Stryker-SR-955HPC and the Galaxy DX-955 that are not only equipped to transmit and receive Hi-Fi in AM with the Asymod IIIs, but also transmit and receive Hi-Fi in SSB, also known as eSSB.

These units are Hi-Fi capable and fully functional on both AM & SSB modes. Solid state switching is used to switch between modes (no relays or switches involved).

Extended SSB Modes

Fig.2

The asymmetrical modulation functionality does not apply to SSB due to its suppressed-carrier properties and characteristics. Only the Hi-Fi audio from one of the buffer stages within the Asymod IIIs is applied directly to the balanced modulator. This method overrides factory limitations and allows for maximum bandwidth SSB transmission and provides for the Hi-Fi transmit functionality on SSB. As for SSB reception, the product detector, receive audio control sections and audio amplifier have been upgraded to pass the maximum amount of audio bandwidth (~14+ kHz). This allows to make the most of the SSB signal’s bandwidth beyond the -3dB +/-2.9 kHz stopband of the 10.695 MHz SSB filter approaching 50 Hz ~ 4.05 kHz – eSSB Medium-1 (Fig.2).

Documentation regarding installation on multimode transceivers using the Asymod IIIs solid state switching via the REM control can be found in the Asymod IIIs Installation Manual starting on page 32. Additional installation instructions regarding multimode transceivers using relays and switches starting on page 21.

Link:

Downloadable Asymod IIIs Installation Manual

Q2.

Will the Asymod IIIs work in any of the AM/FM/SSB Export Radios and in HF rigs? Examples:Galaxy DX-99V (Original model), Galaxy DX-98VHP, Stryker SR-955HPC, Yaesu, Icom, Kenwood?

A2.

Yes it will work on all AM high level modulation transceivers except for those that use vacuum tubes in the final RF amplifier stages, and that is the majority of all CB and 10 meter transceivers. Low level modulation HF multiband transceivers, such as, Yaesu, Icom, Kenwood, Ten Tec, etc. require more work, but nevertheless can be done. The Asymod IIIs has been installed in multiband HF rigs such as the Icom IC-720A and Yaesu FT-757GX with success.

Q3.

Do the finals need to be changed in any of these radios to optimize the Asymod IIIs?

A3.

The finals do not necessarily need to be changed to MOSFETs if it is a transistor final radio, although MOSFETs are more efficient and operate significantly cooler in some cases and generally provide a bit more headroom.

Q4.

Since the Asymod IIIs only works on AM, can it play well with a Top Gun CP-1 installed in the radio as well? For instance, can the Asymod IIIs be used in AM and be turned off by using an external switch and then using another switch to turn on the Top Gun CP-1? Perhaps a SPST On/Off/On switch configured as such:Asymod IIIs (On) / All processors (Off) / Top Gun CP-1 (On).Using this type of switch may ensure that the Asymod IIIs is never turned on while say a Top Gun CP-1 is also installed in the radio?Can this configuration work?

A4.

The Top Gun CP-1, could be installed aside the Asymod IIIs with some kind of alternate switch over scheme. Once the Asymod is installed, the factory TX audio and modulator circuits are completely disabled, literately completely taken out of the circuit and the Asymod takes over. At this point the radio is only used to generate the transmitting frequency and as a receiver, in contrast, the Top Gun CP-1 is an add-on to the factory modulator. Installing both with the switch over functionality will certainly take some extra work but can be done.

Q5.

What would you charge to set up my Galaxy DX-98VHP radio with the Asymod IIIs and a Top Gun CP-1 installed in it?I'm asking because the CP-1 works in AM, FM, and SSB so this would be the best of both worlds.

A5.

The Asymod IIIs Installation on SSB transceivers is $75 (Installation on AM only radios is $50). Top Gun CP-1: $20 and installation $40.

Q6.

If finals need to be upgraded in these radios, exactly what needs to change and what would it cost for you to swap them out?

A6.

There is no need to replace the finals unless is a transistorized single final radio to increase headroom. MOSFET upgrade for Cobra 29s is $35.

Q7.

Can you provide any additional information about the Asymod IIIs in all the radios I mentioned above, please let me know.

A7.

Pertinent Asymod IIIs information and the radios it is installed in can be found in the installation manuals. Installation manuals are created as the Asymod IIIs is installed into different models of transceivers. You can find installation instructions for the Stryker SR-955HPC on page 32, 34 and 7 and for the Cobra 2000GTL on page 41 of the Asymod IIIs installation manual. Installation instructions can be requested for specific transceivers after Asymod IIIs purchases.

Q.

Can you reduce the price on one of your Asymod IIIs and Galaxy DX-29HP unit?

A.

All prices are lower at BXC.mobi on all Asymod products, www.bxc.mobi is the Asymod home and official site dedicated to wideband AM and eSSB.

Q.

I would like to buy a STRYKER SR-955HP & ASYMOD III from BXC.mobi but I have not received my registration confirmation email, how can I complete my registration?

A.

Registration is no longer required to purchase at www.bxc.mobi, however you can register if you like. Most likely the email is going to your spam or junk folder. Simply add the domain www.bargainxchange.com to your safe senders list or add it to your contacts. If you don’t see the confirmation email then, register again after you have added the domain www.bargainxchange.com to your safe senders list. You should now be able to receive the registration confirmation.

Q.

Will the Asymod IIIs work on a RCI 2950 in SSB mode??

A.

The asymmetrical modulation functionality does not apply to SSB due to its suppressed-carrier characteristics. Only the Hi-Fi audio from one of the audio buffer stages within the Asymod IIIs is applied directly to the balance modulator. This method allows for a SSB transmission with maximum bandwidth and provides for the Hi-Fi transmit functionality on SSB. As for SSB reception, the product detector, receive audio control section and audio amplifier are upgraded to pass the maximum amount of audio bandwidth (~14 kHz). This allows to make the most of the SSB signal bandwidth beyond the +/-2.9 kHz stopband of the 10.695 MHz SSB filter (approaching 50 Hz ~ 4.05 kHz – eSSB Medium-1).

Q.

What are we looking at installed turnkey if I send you my Ranger RCI-2950?I'm in Huston, Texas.

A.

Asymod IIIs Installation on SSB transceivers is $75, AM only transceivers is $50. Turnaround is about 2-3 days, excluding shipping time. Please include prepaid return USPS shipping label or add $19.50 to the total for shipping.

Once you decide to proceed, submit the settings required to asyadvice@gmail.com, then a listing will be created for you at BXC.mobi. At that point you would simply sign up and log in at BXC.mobi and purchase your installation package for your transceiver that was created for you. Once check out is completed, you will receive an email with the shipping instructions.

Alternatively, send PayPal payment to sales@bargainxchange.com and submit the settings requirements to asyadvice@gmail.com or via PayPal. Once payment is completed, you will receive an email with the shipping instructions.

Q.

Any updates on the Asymod IV?

A.

The Asymod IV is currently under development and in the prototype stages. The Asymod IIIs, however, will be here sooner.

Q.

Can you share some info yet about your Asymod IIIs? I am currently using your Cobra 29 Classic LTD with external rack gear. Can’t wait for an Asymod radio with more headroom.

A.

The Asymod IIIs will be more versatile in the sense compatibility and ease of installation on multimode as well as on AM only transceivers. It will include solid-state-switching control mainly for use on multimode transceivers, a more simplified internal voltage source design for the positive and negative rails and an onboard preamp. It will also include input and output filter networks and added RF suppression making it less susceptible to free running currents and RF interference. It will also have a better high voltage source rated at 4 amps along with a few other improvements.

Q.

Hate using a dirty class C amplifier as a driver, can I use a class AB amplifier?

A.

Absolutely, a class AB push-pull amplifier will reproduce your original signal more linearly and your audio will sound a lot cleaner. For Hi-Fi audio a class AB is a better choice and is much better than a class C that only conduces less than 50% of the input signal and the distortion at the output is high.

Q.

I would like to order a radio with the Asymod IIIs installed that you don’t have listed. How can I go about this and how much is it?

A.

You may order any transceiver you like and we will install the Asymod IIIs in it. Send the request with transceiver brand, model number, your name and email to asyadvice@gmail.com and a listing will be created for you at bxc.mobi. Once the listing with your transceiver of choice is listed in bxc.mobi, you can log in and purchase it. At that point your transceiver of choice will be ordered and the Asymod IIIs will be installed in it. Please allow about a week to prep the unit.

Q.

I would like to send my radio in to get the Asymod installed in it, how much does this cost?

A.

Asymod IIIs Installation on SSB transceivers is $75, AM only transceivers is $50. Turnaround is about 2-3 days, excluding shipping time. Please include prepaid return USPS shipping label or add $19.50 to the total for shipping.

Once you decide to proceed, submit the settings required to asyadvice@gmail.com, then a listing will be created for you at BXC.mobi. At that point you would simply sign up and log in at BXC.mobi and purchase your installation package for your transceiver that was created for you. Once check out is completed, you will receive an email with the shipping instructions.

Alternatively, send PayPal payment to sales@bargainxchange.com and submit the settings requirements to asyadvice@gmail.com or via PayPal. Once payment is completed, you will receive an email with the shipping instructions.

Q.

I see all the Asymod products here on Facebook but where can I buy them?

A.

Asymod products are available at bxc.mobi and eBay. Just use the keyword “Asymod” on your search. Be sure to look for the BLUThunder logo.

Q. Can you tell me what is it that makes the Asymod IIIs more practical over other AM modulators and its predecessor the Asymod III?

A.

The Asymod IIIs, being a self-contained compact designed unit, only requires only a 12 volt supply and very simple installation without the need for external power supplies and other external connections prone to RF interference. This allows for internal installation in the transceivers, making this unit very practical for mobile operation using audio processing, such as the iRig PRE & iRig PRO interfaces using the companion IK Multimedia's VocalLive Vocal Processor and Recording Studio app on your iOS device that allows use of iOS devices such as the iPhone, iPads and iPad Mini as audio processors.

You may review the Asymod IIIs manuals for additional information.

Asymod video demos:

https://www.youtube.com/watch?v=O0V07heSWd8

https://www.youtube.com/watch?v=oX6LufoV-uY

Q.

Quick question, does the Cobra 29 LX BT receive or only transmit in Hi-Fi? This unit will be around a lot of RF. Is there a way to shield it better?

A.

The Cobra 29 LX BT equipped with the Asymod IIIs transmits and receives, both, in Hi-Fi. The receiver is equipped with a 6 kHz wideband AM filter and audio section has been upgraded to pass all the frequencies within the 6 kHz bandwidth. A good quality full range external speaker is recommended for best results. The COBRA 29 LX BT & ASYMOD IIIs setup is already configured to withstand harsh RF environments and include RF suppression, low pass filters at input and output and RF bypass capacitors at all Vcc junctions and audio paths. No RF interference related issues have been reported. A good rule of thumb is to make sure if you are using an RF power amplifier that is well grounded and use ferrites on all audio and USB wires.

Q.

What is the best way to measure my modulation?

A.

An oscilloscope is a real time, instantaneous RF measuring tool that can show details about a signal that a watt meter will never show. The use of an oscilloscope using an RF coupler or RF pickup device is recommended. Learn more on the NU9N site at this link: http://www.nu9n.com/scope_your_audio.html. You can make your own PC based oscilloscope by following the instructions in the following manual:

Asymod PC Oscilloscope Manual.pdf

Q.

I am new to the Hi-Fi. What else do I need to buy to get this operating? I was thinking REA AMM-SD1 Series - Amplitude Modulation Monitor / oscilloscope into my Laptop. Do you have any setups with ProTools? Is this program free? And as far as a microphone what would u suggest? I guess if u could put together a starter kit list that would be great. That way I'm ready to go.

A.

At the moment there is no complete starter kit available. A typical complete Hi-Fi setup requires the following:

1- A high quality microphone, such as, an Electro Voice RE20 or similar with shock mount and desk boom.

2- Audio processing gear, could be computer based like ProTools or the iRig PRE or iRig PRO interface using its companion IK Multimedia's VocalLive Vocal Processor app on your iOS device or studio rack mount audio processing gear.

3- An RF power PEP meter with a low scale, say, 20 ~ 50 watts to monitor the transceiver power output.

4- An oscilloscope to monitor your modulation envelope and assure you are not pinching or clipping and an RF coupler which is a device that takes a sample of the RF signal from your transmission line to supply the oscilloscope, otherwise you can simply use a RF Sampler Element for Bird 43 watt meters such as a Bird 4274-025 or a Coaxial Dynamics CDI 87005 (seen on page 3, FIG 8B in the Asymod IIIs Operation and Troubleshooting Guide. The PC based REA AMM-SD1 Series - Amplitude Modulation Monitor would be a good choice since it has negative & positive modulation percentage meters, oscilloscope and it comes with its RF pickup unit.

5- A good AM receiver with a 6 kHz bandwidth along with a good set of headphones to monitor yourself.

6- An HF, RF power amplifier (Class AB preferred, class C can be used but is not as clean as it passes less than 50% of the signal).

7- If using computer audio processing with Protools, the ProTool sessions are free and available for download at the following link:

https://www.bargainxchange.com/ProTool-Sessions

The latest ProTools and its most current interface are available and are not free. The most widely used version of ProTools for this application is ProTools LE version 8.0.5 which is an older version and it can be downloaded from the Avid website and requires the Mbox 2 Mini external interface that can be found on eBay. The microphone connects to the Mbox 2 Mini, the audio output of the Mbox 2 Mini is then connected to the transceiver’s rear Line In connector, the Mbox 2 Mini connects and is powered via a USB connector to your computer and controlled by ProTools.

Q.

Ok just so I get this correct, the Asymod IIIs will work in my Stryker SR-955HPC on SSB for 6k of bandwidth transmit and receive but not the 300 % modulation correct?

A.

Just to clarify,

Regarding SSB, only the Hi-Fi audio from one of the audio buffer stages within the Asymod IIIs is applied directly to the balance modulator. This method allows for a SSB transmission with maximum bandwidth and provides for the Hi-Fi transmit functionality on SSB. As for SSB reception, the product detector, receive audio control section and audio amplifier have been upgraded to pass the maximum amount of audio bandwidth (~14 kHz). This allows to make the most of the SSB signal bandwidth beyond the +/-2.9 kHz stopband of the 10.695 MHz SSB filter (approaching 50 Hz ~ 4.05 kHz – eSSB Medium 1). The asymmetrical modulation function does not apply to SSB due to its suppressed-carrier characteristics. Unlike AM, where AM-Depth (modulation percentage) is the carrier to peak ratio (the relationship between the amplitude of the modulating signal and the amplitude of the carrier signal) where in regards to asymmetrical modulation the negative peaks are limited and gain is applied to the positive peaks to produce the modulation percentage desired beyond +100%. In contrast, SSB is measured in terms of peak envelope power (PEP) where the signal’s actual power is dependent upon the level of the modulating signal.

Regarding AM, during transmit, the Asymod IIIs takes over the entire transmit function. The transceiver is merely used as a frequency generator that produces the TX carrier frequency. On AM receive, the factory 3 kHz AM filter has been replaced by a 6 kHz wideband filter, the AM detector, receive audio control section and audio amplifier have been upgraded to pass the maximum amount of audio bandwidth (~14 kHz).

Q.

Can I send you my radio for installation of the Asymod IIIs? How much would you charge to do it and how long will it take? Thanks.

A. 

Asymod IIIs Installation on SSB transceivers is $75, AM only transceivers is $50. Turnaround is about 2-3 days, excluding shipping time.  

Once you decide to proceed, submit the settings required and your PayPal email address to asyadvice@gmail.com and you will receive a PayPal payment request. Once payment posts, you will receive an email with the shipping instructions.

Alternatively, send a PayPal payment to sales@bargainxchange.com and submit the settings requirements to asyadvice@gmail.com or via PayPal. Once payment posts, you will receive an email with the shipping instructions.

NOTE: Please include prepaid return USPS shipping label or add $19.50 to the total for shipping.

Q.

I’m having trouble installing ProTools 8.0.1 and the update 8.0.5 on Windows 10, any suggestions?

A.

ProTools 8.0.5 runs on Windows 10 with no issues. If you have partially installed anything related to ProTools, uninstall it using the uninstaller or Revo Uninstaller and start fresh. First install version 8.0.1, when done install the 8.0.5 update and last install the plugins.

Q.

Can you please provide the link for the ProTools sessions?

A.

http://asymod.am/p/sessions

Q.

I’m currently using an electret/condenser microphone and I can’t get rid of the feedback when I monitor myself on a receiver with my headphones.

A.

The first thing is to adjust the gate threshold levels in the multiband dynamics, specially targeting and attenuating those frequencies that are feeding back as seen on the spectrum analyzer and use headphones with close fitted snug muffs and are well acoustically insulated. Most electret microphones are very rich in highs and are easily prone to generating feedback. A better choice would be a dynamic cardioid microphone with a more flat response.

For help with eliminating feedback go to page 11 on the Asymod IIIs Operation & Troubleshooting Guide.

Q.

Can I use a condenser microphone with the ProTools interface?

A.

Yes, the Mbox2 Mini and other ProTools interface devices provide phantom power which is required for condenser/electret microphones.

Q.

My power supply was giving me a hum if turned on. Should I use a separate supply for just the radio?

A.

If you hear a low hum while you monitor yourself on a receiver it doesn’t necessarily mean it presents a problem. In most cases the quality of the receiver or the close proximity of transmitter/receiver causes this effect the majority of the time and is not heard by other stations at a distance. If you know for sure you have a power supply induced hum, use a linear well filtered supply just for the transceiver. If running an amplifier, use large enough ferrites where you can wind 2 or 3 turns on all audio and data/USB cables to avoid software crashes and audio hum, and of course, always use a good ground.

Q.

Looking at a video gate from a local operator of me while I was using the Cobra 29 LX BT with my two amplifiers, I noticed his S meter is only showing a swing but no carrier. Not sure if the very low carrier is supposed to be like this. But sounds great. Let me know thanks.

A.

Transmitter and amplifier matching is very important. It looks like you are not driving your amp sufficiently, or if the amp has an input attenuator (a variable control) most of the time the 1 watt dead key/carrier is mostly dissipated in the amplifier’s input attenuation network and doesn’t allow for proper drive. If you are running cascading amplifiers, or one amp driving the next, monitor the output of the first amp in line. Make sure the radio’s 1 or 1.5 watts of carrier is driving it enough to get a nominal carrier out of the amp. Start with a simple setup and work yourself up to a more complex setup once you’ve got all the right settings, this will simplify things and eliminate the guess work. To do this correctly an oscilloscope is required. Refer to the NU9N page “Scope Your SSB and AM Audio Modulation, Amplifier and System Linearity” at http://www.nu9n.com/scope_your_audio.html.

Run the radio by itself first, make sure you have 1.5 watts carrier peaking to 10 watts (about 160% modulation) and audio is right. Then, install the first amp, make sure when you dead key a 1.5 watt carrier out of your radio you are getting a proportional carrier out of the amp, modulate and check for headroom. Maxing out your amplifier will degrade modulation quality. Once this setup is perfect and it all checks out on the oscilloscope, you may move on to installing your final amplifier and repeat the same previous steps, check carrier level, modulation and make sure to maintain sufficient reserved headroom.

For best audio use class AB biased amplifiers, class C amplifiers merely pass 50% of your signal and distortion is high.

Q.

Where can I find Asymod related information?

A.

Click on the "Downloads" button on the main menu at the top of the page.

Q.

I love the Galaxy DX-959 with the Asymod III I purchased from you. Can you do a RCI-2970N2?

A.

Yes, the Asymod IIIs can be installed in the RCI-2970N2 and in any high-level modulation radio with ease. Low-level modulation radios require more work such as most HF multiband transceivers, from the oldest and lower cost such as a Yaesu FT-757GX to and Icom IC-720A to the high end such as the Yaesu FT-9000, Icom IC-7851, etc. The only true exceptions are hybrids with vacuum tube PA’s, vacuum tube transceivers where Plate, Grid, or Cathode modulation methods are employed.

Q.

Can you install the Asymod IIIs on any radio?

A.

The Asymod can be installed internally in any radio as long as it has the space, otherwise it has to be mounted externally. There are very few exceptions.

Q.

I need the Asymod IIIs installed in a radio with sub and also extra channels as I talk below channel 40 aka the basement with my local people.

A.

Currently the two most popular radios that sell and are readily available with the Asymod IIIs with sub frequencies are the Galaxy DX-29HP and the Stryker SR-955HPC, but you can choose any radio you like and it will be ordered for you and set up with the Asymod IIIs. Simply, send your request to asyadvice@gmail.com with the details and a listing will be created for you. You would  purchase your listing. At that point, the radio will be ordered and set up with the Asymod IIIs for you.

Q.

Can you put extra channels in the Cobra 29 LX BT or any radios you offer? If not can you install the Asymod on a radio I have already installed the expansion board? And how much is that cost?

A.

Yes, extra channels can be added to the Cobra 29 LX BT or any other radio of your choice. The channel expansion board and the Asymod will be installed for you.

To send in your radio, simply send your request and PayPal address to asyadvice@gmail.com with the details and a you will receive a PayPal payment request. Once payment posts you will receive an email with the shipping instructions and the Asymod will be installed for you.

If you would like to install the Asymod IIIs on a radio you have already installed the expansion board in, simply submit the request with all the details; brand, model, etc. to asyadvice@gmail.com and we will send  a PayPal payment request. At that point you may send the PayPal payment to sales@bargainxchange.com. Once payment posts, you will receive an email with the shipping instructions. Please include prepaid return USPS shipping label or add 19.50 to the the total.

Q.

Hi there, I cannot find your PayPal account email address, only your email for BargainXchange.

Can you let me know your PayPal account email address so I can send payment?

A.

sales@bargainxchange.com

Q.

I am located in Austria. Is a longer broadcast with your Stryker SR-955HPC possible (heating)?

Does it work with any HF amplifier (12/10m band) or do you recommend one?

A.

Nominal settings for the Asymod IIIs and the Stryker SR-955HPC on AM are 3.5 watts of carrier power and modulation at 250% which produces ~32 watts of peak envelope power. This unit is rated at 60 - 70 watts PEP, so that leaves plenty of headroom to operate it on longer than long winded, two way conversation typical duty cycles. 100% transmit duty cycle is possible with an external cooling fan at this setting.

You can order any combination of carrier level and modulation percentage. Max recommended carrier level is 5 watts for long duty cycles, but can go as high as 10 watts (not recommended for long duty cycles). Each carrier/modulation percentage combination setting has a directly proportional PEP output. Modulation percentage factor multiplied by carrier equals peak envelope power output. The factors and ratios are listed in the item description and in Fig.1 above.

A class AB amplifier operating in the rage of 12/10m band or any broadband 1.8 to 30 MHz amplifier will do. Headroom on the amplifier is also very important to maintain clarity and avoid distortion. If you already have an amplifier, provide make and model and the best settings for the Asymod IIIs and the Stryker SR-955HPC will be recommended. Otherwise with these settings it would work well with a 600 to 1000 Watt tube amplifier. If using a solid state amplifier, the drive requirements will very important since these amplifiers are less forgiving than tube amplifiers. Levels on the Asymod IIIs must be set accordingly to stay within the amplifier’s operating limits while preserving headroom. You can always adjust the Asymod IIIs yourself to match any amplifier drive requirements.

Q.

How can I send you more information including some PDF files regarding my setup since eBay doesn't allow exchanging email addresses through their message system?

A.

You can contact us at asyadvice@gmail.com. This is the customer support email for all Asymod products and is displayed at the end of all demo video presentations.

Q.

I have a small problem. I’m running the Asymod III, not the newer Asymod IIIs. Is there a way to turn up the dead key? I'm having trouble activating my amplifier? Help!!

A.

Yes there is. The right way to do this is with an oscilloscope. If you have a good ear, you are welcome to try without one. The dead key can be raised by turning the CAR control counterclockwise on the Asymod III. Once the dead key is raised to the desired setting, the audio has to be raised accordingly to achieve 99% negative peaks. The audio can be raised by turning the Level control counterclockwise (Asymod III). If the Level control is maxed out (counter clockwise position), then you can either raise the audio level from your audio gear or you can slightly raise the Gain control on the Asymod III. Last, you set the asymmetry level to render the modulation percentage desired. The ASY control increases in the counterclockwise direction, you will notice as more counterclockwise, the higher the peaks, don't overdo it because you don't want to exceed ~250 % modulation. Whenever the carrier is raised the asymmetry has to come down. (Don't move it too far from where it is at now, take a picture of the controls in case you go too far off you'll know how to set them back.) Recommend from 200% to 250% for voice. For audio with music content 120% to 130% (MAX) is recommended.

Q.

Is there a procedure to adjust the Asymod without the use of an oscilloscope?

A.

Yes, the adjustment procedure may be done without an oscilloscope with the use of an accurate PEP meter and by following the chart seen in Fig.1 above. Note that there are differences in the direction of the controls between the Asymod III and the Asymod IIIs and you must refer to their respective Operation & Troubleshooting Guide for the correct direction to raise or lower the levels.

For the Asymod III, the Gain goes up CW, the LEVEL, CAR and ASY go up CCW.

For the Asymod IIIs, all controls go up in the CW direction.

  1. Turn all controls down, GAIN, LEVEL, CAR, and ASY refer to the Operation & Troubleshooting Guides.
  2. Set the dead key where desired by raising the CAR control.
  3. Raise the Level control while injecting a 1 kHz tone or by speaking into the microphone at a normal level until you see 4 times the power of the dead key on the meter. For example, if you set a 2 watt dead key, you should see 8 watts of PEP.
  4. Raise the Asymmetry control (ASY) to the desired modulation percentage desired according to the chart seen on Fig.1 above. For example, if you want 200% modulation, the chart says 200% modulation is 8 x the carrier power, so here you would raise the asymmetry control until you see 16 watts of PEP on the meter. Hence 8 x 2 watts of carrier = 16 watts PEP. And there. You’re done!

Q.

I’m running the Asymod IIIs, how can I turn up the dead key? I can’t seem to key my amplifier?

A.

Refer to the Asymod IIIs Operation & Troubleshooting Guide starting on page 3.

Q.

Still evaluating the Stryker SR-955HPC with the Asymod IIIs. It is all good, but I’m thinking of raising the dead key.

A.

If you raise the dead key, the audio level will have to be raised just a bit to reach very close to the negative 100% modulation peaks and the asymmetry control adjusted to reach the positive modulation peaks desired. Follow the instructions in the ASYMOD IIIs & STRYKER SR-955HPC SETTINGS manual.

Q.

What are the recommended modulation levels for playing audio content with music?

A.

Recommended settings for audio content with music is 120% to 130% modulation (MAX) is recommended. For voice 100% and up, however, 200% to 250% is a good range.

Q,

We are almost done with your Stryker SR-955HPC & Asymod IIIs. We would like for the unit to arrive with the correct settings to match your setup and amplifier drive requirements. To avoid future issues, please provide the level of carrier and modulation percentage you would like so that we can make all the final adjustments before sending it out.

A.

1.5 watt carrier and all you can get I guess 250%?

Q. (cont.)

With a 1.5 Watt carrier at 250% modulation the PEP is only going to be 15 watts. Unless the amplifier drive requirements call for 1.5 watt carrier, it is suggested to get the most out of it since the Stryker SR-955HPC is a high power radio and offers plenty of headroom. Carrier can be as high as 5.5 watts @ 250% mod / 55 watts PEP. At the moment it is set conservatively at a 4 watt carrier, 250 % mod producing about 33 watts PEP.

The reason why I ask is because operators sometimes have the need to raise the carrier after they receive their units and the Asymod requires audio and asymmetry level adjustments every time the carrier is changed that are best done with an oscilloscope. Please confirm you still want the 1.5 watt carrier.

A.

Leave it at a 4 watt carrier, 250 % mod at 33 watts PEP. I will use the amplifier’s variable attenuator to set it where is best.

Q.

To run this in a mobile how will I get my audio processing? Will I have to use a laptop and download ProTools?

A.

Audio processing for mobile operation is possible with the use of the iRig PRE or iRig PRO interface using the companion IK Multimedia's VocalLive Vocal Processor and Recording Studio app on your iOS device. Audio processing for base operation is possible with the use of rack audio processing gear or computer based processing such as ProTools for PC or Mac along with the companion interface such as the Mbox 2 Mini or newer. ProTools may be used for mobile operation with a laptop.

Q.

Can I use a good quality microphone connected to the front mic jack with no processing?

A.

You can always just use a good microphone like an EV RE20 connected to the microphone front panel input jack and it will give you the Hi-Fi asymmetrical modulation and quality but very flat, however, not only does this defeat the purpose of a Hi-Fi setup but should only be used in this manner as a last resort and in case there is no audio process gear available at that moment. It is always best to have processed audio fed at the Line-In ¼” TS connector for this system to sound as it is meant to. This will enhance the voice, giving it depth and significant dynamics which makes it stand out and makes a very significant improvement in audio quality.

Q.

Once the Asymod IIIs is preset, can the carrier be set from inside?

A.

All Asymod ready transceivers are set to the customer’s required specs. The Asymod can be set to any carrier level required, however, the audio Level and Asymmetry controls will require readjustment whenever the carrier level is changed. This requires an oscilloscope to ensure the modulation envelope is correct. So yes, it can be done from the inside. In some cases external Asymod controls have been requested.

Q.

Where can I download the ProTools sessions?

A.

By clicking on the "Sessions" button on the main menu at the top of the page.

Q.

Where can I find the Asymod manuals?

A.

By clicking on the "Manuals" icon under the home page slider.

Q.

I would like the AM carrier on my Stryker SR-955HPC to be 15W max swinging to the maximum possible to drive my amps. I have 2 custom 6 pill, 2879 amps and 2 ICOM ham amps. 150 to 200% modulation or your best recommendation with this equipment. Wide open on SSB also please. Looking forward to this and thanks for the info. Also, what would be the best voltage for the Stryker SR-955HPC? I can run up to 15 volts. Thanks again.

A.

Let’s take 200% modulation as a starting point. 200% modulation is 8 times the carrier power. This radio is rated at 60 watts PEP max. (Although some claim it does a bit more, perhaps with higher voltage. The Stryker SR955 is designed to work on a 13.8 volt DC supply, I wouldn't recommend anything more.)

To calculate the highest carrier possible and to still be able to achieve 200% modulation within the available headroom we have to divide the maximum PEP power available (total headroom PEP watts) by 8 (multiplication factor for 200% modulation). Available headroom is 60 watts PEP.

60 divided by 8 = 7.5 watts

So this tells us the maximum carrier level that we can use to preserve the headroom needed for the 200% modulation, in this case is 7.5 watts of carrier power. At this setting you will have peaks of 60 watts with a 200% clean modulated signal. This setting will work best for you in sight of your high drive amplifiers as the Icom IC-2KL, IC-4KL, IC-PW1 which can handle ~80 – 100 watts PEP of drive and your straight 6 x 2SC2879 that can handle ~60 watts PEP of drive.

Q.

What is the most frequently and highest requested dead key settings for the Stryker SR-955HPC?

A.

1.5 watts @ 250% mod, 16.5 watts PEP is the most popular setting, and the highest carrier that has been ordered is 4 watts at 250% modulation which renders 44 watts PEP.

Q.

Hi there! I have been following your new product with interest! I had a couple of questions for you.

I have a Stryker 955 and I wanted to add the Asymod IIIs to it. Can I pay to have it installed and set up by you or would I need a third party to do this for me? Do I leave it as set up when it's installed in my radio or can I turn it down from the mic gain up front if needed? Lastly what is the warranty on your product?

A.

You can send your Stryker in and the Asymod IIIs will be installed for you.

Asymod IIIs Installation on SSB transceivers is $75, AM only transceivers is $50. Turnaround is about 2-3 days, excluding shipping time. Please include prepaid return USPS shipping label or add $19.50 to the total for shipping.

Simply submit the request with all the details; brand, model, etc. to asyadvice@gmail.com and we will respond with the total. At that point you may send the PayPal payment to sales@bargainxchange.com. Once payment is completed, you will receive an email with the shipping instructions.

All of the adjustments on the Asymod board are strictly for AM only. You can request specific dead key/carrier and modulation levels required to match your setup. Line level audio from a preamp, mixer or audio processor can be fed via the rear Line-In connector. Microphone level input using the hand mic or other mic can be fed via the front mic connector. The Mic Gain control is ONLY active when using the front mic connector. Internal adjustments to the Asymod IIIs unit can be done by you, however, it is recommended to use an oscilloscope following the instructions on the downloadable Asymod IIIs Operation & Troubleshooting Guide and Installation Manual. Here is the download link:

Asymod IIIs Operation & Troubleshooting Guide.pdf

As for SSB, you can use the Mic Gain if using a mic connected to the front mic jack, otherwise if using the Line-In there are two internal adjustments, SSB Limit and SSB Input Gain.

The Asymod IIIs is warrantied for life. Any damage or repairs directly to the Asymod board are fully covered. Shipping both ways is not covered.

Q.

Hi, curious on how much to have the Asymod IIIs installed in a CRE8900/ ALINCO DX10 (same radio) or Ranger 2950DX both new in box. Both radios are the V3 version. Any difference in price for install? Quote for both installs? Another quick question, what do you do with the variable power output knob on the radio? Would these now be obsolete or would they still be operational? Thanks Dave.

A.

Installation on multimode radios is $75, on AM only radios is $50. The variable power output knob on the radio will be functional for FM mode if applicable and depending on how the radio is factory wired which varies from model to model, but not for AM, as all the AM settings are on the Asymod board.

Q.

Where can I find and download Asymod manuals and related information?

A.

All manuals can be found and downloaded by clicking on the “Downloads” link at the footer of the www.bxc.mobi home page.

Direct link to all manuals:

https://www.bargainxchange.com/Asymod-Manuals

Q.

Can you provide a complete list of the items it would take to make your Asymod ready radios to work properly, like for instance, you say it would work well with the Electro Voice RE20, and how about the other equipment that goes in-line with that. And, if you would, let me know where I can get these items.

A.

A- For audio processing get the Mbox 2 Mini, about $50 on eBay. (This is the Audio interface Pro Tools requires).

B- Download Pro Tools 8.0.1, Pro Tools 8.0.5 Updater, plugins & Pro Tool sessions.

C- Microphone:

Option 1 - Best deal, best quality

  • Electro-Voice RE20 Microphone Kit with Shock Mount & Two-Section Broadcast Arm complete package deal. (eBay)

Option 2 – Cheap but good quality, need desk boom, etc.

  • Shure SM58-LC Dynamic Unidirectional Wired XLR Professional vocal Microphone. (eBay)

Option 3 - Good but expensive, mic only, no boom, shock mount, or cables, etc.

  • Shure SM7B (Cardioid Dynamic Vocal Mic). (eBay)

D- Headphones with close fitted snug muffs and are well acoustically insulated so they don’t feedback to monitor yourself on a receiver while you transmit.

  • PIONEER HDJ-1500-S PROFESSIONAL PRO DJ HEADPHONES. (eBay)

E- A Hi-Fi wideband receiver

  • Drake R8 Shortwave AM SSB Ham Radio Receiver eBay item number: 391535838952 (Or similar, Icom, Kenwood, etc). (eBay)

F- Oscilloscope at least 30 MHz

  • TEKTRONIX 2236A 100MHz (Will do the job, cheap and working). (eBay)

H- Coupler for oscilloscope

Option 1-

  • Variable RF Sampler Model RF-S2K or similar. (eBay)

Option 2-

Otherwise you can simply use a RF Sampler Element for Bird 43 watt meters such as a Bird 4274-025 or a Coaxial Dynamics CDI 87005.

  • Bird 43 Wattmeter Sampler Coupler Element 25-1000 MHz. (eBay)

Option 3-

Make your own as seen on page 3 on Fig 8 of the Asymod IIIs Operation and Troubleshooting guide.

Hope this helps

Q.

Do you mean I will have to have my computer inline for all of this to work properly? And what you are saying, Pro Tools controls all of this? Do you think CBers will understand all of this? Not hardly.

A.

Hello,

All radio operators doing Hi-Fi use one form of audio processing or another and knows audio processing gives you the punch, depth, quality and bandwidth that make it stand out from the rest. Whether it is computer based or a standalone unit.

If you don't want to use a computer, you can use something as simple as a Behringer Eurorack MX602A mixer console that contains the basic equalizer and level controls that goes for about $40 on eBay with the Sure SM58 microphone but this leaves you without out compression and multiband limiting, etc.

A complete standalone processor that provides Proper Balancing of Audio Amplitude Equalization is the Behringer DEQ-2496. Read about it regarding AM processing in the following link:

http://www.nu9n.com/am.html#6

Another way you can process your audio is by using the iRig PRO. Take a look how others use it in the following videos:

https://www.youtube.com/watch?v=tbbTX4Avhl4

https://www.youtube.com/watch?v=qVjD60u1dsk

https://www.youtube.com/watch?v=7X_-Mf9MzEE

All the CBers that are into Hi-Fi may not of know the details before they got into Hi-Fi radio, but they learn because they are interested in sounding good.

And, yes, Pro Tools controls your audio levels and audio processes.

Q.

Would it be possible to order the Stryker SR-955HPC with the Asymod IIIs installed in a separate enclosure so I can control the Asymod IIIs? Also I run all my processed audio thru the regular mic jack. Can you set this radio up like that? Thanks.

A.

Setting up the Asymod IIIs externally while using the front mic jack will require quite a bit of external wiring. Audio out, power out, modulator in, SSB audio in & mode control wires would have to be installed at the rear panel. As you can see the Stryker SR-955 HPC is somewhat limited in space at the rear panel. May I suggest drilling 4 small holes on the bottom cover aligned with the 4 adjustment VRs on the Asymod IIIs. This way you have access to all the controls with the use of a tuning wand without all the external connections. Another alternative would be to have only the control VRs mounted in an external enclosure.

Q.

Is the Stryker SR-955HPC the radio to go with as far as the receiver or would you recommend a different radio. I would really like to have the Asymod in the separate enclosure due to the place the radio will be mounted. I don't talk sideband so that's not an issue to me. I talk only AM. Suggestions?

A.

The best option is to mount the controls VRs in a small enclosure outside the radio. This will allow for the Asymod IIIs to be at close proximity to its working environment including heat sink mounting which is important. As far as the receiver, The Stryker 955 is super stable and better built than most other similar radios. Most SSB users use this radio because of its frequency stability. It does not drift.

Q.

Also can you put a 9 kHz filter in it?

A.

I can put a 7.5 kHz filter in it. That is the widest I have. That bandwidth is actually 7.5 kHz UP and 7.5 kHz DOWN, a total of 15 kHz. Anything wider you will be hearing the adjacent channels.

Q.

Does the Stryker SR-955HPC have a relay on the back of it to run an amplifier like an RCA jack also does this radio have the MARS/CAP frequencies thank you?

A.

Yes an internal amplifier key relay may be added for an additional $25, the jack will be a 1/8” TS connector due to the small room available in the rear panel. The MARS/CAP frequency expansion will be done at no charge. Coverage is from 24.000 MHz to 30.0150 MHz.

Q.

Hello: I would be using the ON AIR DESIGN box for my audio inputs. Can I use their PTT instead of the mouse you have? I use a very simple set-up with a Behringer 1002 and either a Heil 781 or Shure 58 and simple 1K amplifier with 2 watts DK and 12 peak RMS. Thank you for your time.

A.

Yes you can. As it applies to the Stryker SR-955HPC, simply feed the audio from the On Air Design box into the Line-In at the rear panel of the radio and key the radio by the front mic jack or the rear panel with the PTT signal coming out of the On Air Design box. You might need to split the output of the On Air Design box into audio and PTT. The rear Line-In should be used for Hi-Fi applications as the front mic jack audio passes through the transceivers audio preamp, and although it has been upgraded to pass wideband audio, it still has some factory limitations. Otherwise, you can simply connect the On Air Design box directly to the 4 pin mic jack as you do with all your other radios and see if you are happy with the results before you try using the Line-In at the rear panel.