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BLUTHUNDER Technologies Asymod 7 User Manual

Asymmetrical hi-fi am/essb modulator
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Asymod products are available at
www.asymod.am
Customer support:
asymod@asymod.am
"Asymod" is a registered trademark and may not be reproduced or used by any means
or in any form whatsoever.
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Summary of Contents for BLUTHUNDER Technologies Asymod 7

  • Page 1 Asymod products are available at www.asymod.am Customer support: asymod@asymod.am “Asymod” is a registered trademark and may not be reproduced or used by any means or in any form whatsoever. - 1 -...

  • Page 2: General Description

    & proud. The Asymod 7 expands your radio’s TX audio bandwidth and allows you to increase your audio loudness without distortion using the asymmetrical functionality. The Asymod 7 has a 15 kHz TX bandwidth which can be adjusted in the audio process by rolling off the high frequencies to the desired bandwidth.
  • Page 3 ProTools for PC or Mac along with the companion interface such as the Mbox 2 Mini or newer. The Asymod 7 is NOT designed to give transceivers more RF power, more swing, or loud distorted modulation.
  • Page 4 Terminal, Component, and Adjustment Locations IMPORTANT: The modulator’s output transistors, Q1 or Q2, whichever used, must be mounted on a reasonable size heatsink to maintain operating temperature to a minimum. This is critical especially at low carrier levels to maintain carrier stability and to avoid fluctuations due to increasing component operating temperature.
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  • Page 6 Although in most cases it may not present an issue, sometimes the bias may need adjustment. The ideal rig to use with the Asymod 7, is a dual final, single mode, AM only transceiver. Class C bias or close to it should be employed in the RF final stages to allow for -100% modulation peaks and achieve the correct asymmetry, some exceptions are the Yaesu FTDX-1200 and the Icom IC-7300.
  • Page 7 Stryker SR-955 V1 Installation Above we can see how simple the Asymod 7 is to install. Only 6 easy steps. Connect Power, Mod Out, AM 8V, eSSB Out, Audio In and Audio Out. - 7 -...
  • Page 8 Asymod 7 Quick Settings • Turn all settings counterclockwise. • Raise carrier to desired power. For example, let’s say we want a 1 watt carrier. • Feed 800 hertz tone or steady voice tone into line in. • Raise the level control till you get 4 times the carrier in PEP, in this case, 4 watts PEP.

  • Page 9: Getting Started

    Depending on which transceiver, follow the instructions in the the following link: https://drive.google.com/file/d/1SmeKYZ1BU37dPwbD4UlPxJh2j7H9iFnd/view, which is very similar to the Asymod 7. Keep the wire runs as short as possible and use shielded wire for all audio connections. Make sure the Asymod 7 is connected to the 12 volt source, the audio input is connected using shielded audio cable, the output is connected to the final stage of the transmitter, the remote (REM) is connected to the transceiver’s +8V AM.
  • Page 10 Adjustments and Locations Asymod 7 units purchased separately are calibrated using a standard 4 Watt transceiver set to 1W carrier and peaks of about 9W-12W (about 250% modulation) when modulated with a 1 kHz tone @ line level (pro) unity gain 0 dBu, 1.095V PK, 2.19V PP. unless otherwise requested.

  • Page 11: Adjustment Procedure

    It is recommended to first try and run the Asymod 7 as it arrives. If carrier or audio levels require adjustment to match your setup, it may then be adjusted using an oscilloscope. To perform a complete adjustment procedure, refer to FIG. 9 for adjustment locations. During the adjustment procedure, try to keep the transmission intervals to a minimum.
  • Page 12 10- Set the oscilloscope to 20 volts/div (may vary according to RF coupler used) and adjust the • variable voltage adjustment until you see a steady carrier of two divisions and center it to the 0v line as seen bellow on FIG. 10. FIG 10 11- Unkey the transceiver.
  • Page 13 Level control. If negative peaks are not reaching down to the 0 volt line increase the Level control. • 18- A maximum of +250% modulation can be achieved with this 1 Watt carrier setting on this standard 4 watt, single final transistor transceiver without pinching or clipping. If higher levels of modulation percentage are desired using this type of transceiver, start by bringing the unmodulated carrier to ¾W or .75W and continue to step 10.
  • Page 14 FIG 13 20- Finally, connect the output from the audio process chain to the Asymod 7 Line In. Key down • the transceiver and speak into the microphone with a normal voice. Adjust your audio levels from the audio processing chain not to exceed your set maximum positive and negative modulation peaks during the previous tuning procedure.
  • Page 15 Begin turning the Asy control clockwise and set the modulation level where desired. • A maximum of 350% modulation can be achieved with this .5 (1/2) Watt carrier without • pinching or clipping. • Disconnect the Signal Generator and connect the audio out from the audio process chain to Line •...
  • Page 16 1.5 Watt carrier / 200% Modulation max • Turn Gain fully counterclockwise. Turn Level, Car and Asy fully counterclockwise. • TX & Turn Car clockwise to 1 Watt on meter. • • Set Oscilloscope at 20 Volts per division and TX and adjust Variable Volt control to occupy 2 divisions centered at 0v.
  • Page 17 8- If using computer audio processing with Protools, the ProTool sessions are available for download for free. To achieve optimum results and to make the most of the Asymod 7, an adequate AM audio process chain catered to emphasize on your natural voice is highly recommended.
  • Page 18 Fig 14 Feedback Most operators like to monitor their audio while transmitting, and for this, a few things need to be considered to avoid fluttering feedback. Due to the Asymod’s wideband flat audio response capability, all audio frequencies from 20 Hz to 14 kHz will be passed. This creates a situation where the higher frequencies are passed at the same levels as the lower frequencies.
  • Page 19 Gates Gates affect unwanted signals below the threshold, these are either attenuated or muted. Signals above the threshold pass through unaffected, unless some attack is applied. A gate only cares whether the signal is above or below the threshold; a gate is said to be closed when the signal is below the threshold and open when the signal is above it.

  • Page 20: Troubleshooting

    Troubleshooting Reminder: Take care not to overheat components when soldering. All configurations of Q3 or Q4 are referred below as “Q”. Symptom: Transceiver with full output power when keyed. Issue: Possible bad Q or Q1. Solution: 1- Set the carrier level about half way. 2- Check the voltage at the +MOD OUT terminal, if the voltage reads anywhere close to 0 or 24 volts, remove Q.

  • Page 21: Absolute Maximum Ratings

    Solution 1: Check the power cables for continuity, make sure they are well connected and that there is 12 volts applied to the unit, check your voltage levels and make sure that the correct voltages are present at the board, refer to figure 15. If this does not fix the problem, go to Solution 2 below. Solution 2: Check for +24 volts, if not present, replace DC/DC converter.
  • Page 22 Shielded cable should be used in all audio connections and RF bypass capacitors wherever possible. The Asymod 6 comes with: Downloadable PC Oscilloscope Manual (For those who don't have oscilloscopes) • Asymod 7 Manual • Asymod FAQs • Mounting hardware •...
  • Page 23 the waveform being transmitted. That waveform may, for instance, correspond to the sounds to be reproduced by a loudspeaker, or the light intensity of television pixels. This technique contrasts with frequency modulation, in which the frequency of the carrier signal is varied, and phase modulation, in which its phase is varied. Hardware - 23 -...
  • Page 24 Additional installation related information can be located at the following links: Asymod IIIs Installation Manual.pdf https://drive.google.com/file/d/1SmeKYZ1BU37dPwbD4UlPxJh2j7H9iFnd/view Asymod IIIs Operation & Troubleshooting Guide.pdf https://drive.google.com/file/d/198IdCZiBnF0LDgD8g1AJz6-qdhhl5uHJ/view FAQ’s: https://asymod.am/p/faq - 24 -...
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  • Page 26 STRYKER SR-955 V2 INSTALLATION - 26 -...
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  • Page 44 Questions? Contact us at asymod@asymod.am Customer support: Asymod products are available at asymod@asymod.am www.asymod.am “Asymod” is a registered trademark and may not be reproduced or used by any means or in any form whatsoever. - 44 -...