The Asymod 7 comes with downloadable:

7 User Manual

Downloadable PC Oscilloscope Manual (For those who don't have oscilloscopes)

The Asymod 7 compact design makes it ideal for mobile and base operation and allows for internal mounting and simple installation in the transceiver with the included hardware and only requires a 12 Volt supply. The Asymod 7 expands the transmitter’s audio bandwidth from the stock 3 kHz to well over 10 kHz. On board preset active and passive low pass filters can be set to 6, 8 or 10 kHz roll offs. This allows for the entire selected audio bandwidth to be transmitted.

The asymmetrical functionality controls the audio loudness level and provides for amplitudes in excess of +300% modulation while not exceeding the negative peaks at -100% without the use of negative peak limiting or clipping methods which produce squaring of the modulation envelope and provides for increased spectral density. The Asymod 7 is compatible with most transceivers and it is fully adjustable via the onboard controls and accepts microphone and line level inputs. It offers the flexibility to use a stock hand mic to a high end processing audio chain using a broadcast microphone. This unit will work with all High Level Modulation transceivers by direct coupling to the driver and final’s collectors via the existing transceiver's onboard RF chokes without the need for a heavy, costly and large modulation transformer.

The Asymod 7 produces modulation levels well above the norm and broadcast levels without distortion, allowing for your station to sound loud and clean. With the Asymod 6 connected to your audio processing chain you will sound just as or better than commercial broadcast stations.

To achieve optimum results and to make the most of the Asymod 7, adequate audio processing catered to emphasize on your natural voice is necessary.

NOTE: IMPORTANT

The transceiver/radio is only the exciter and should not be expected to generate high levels of RF power, it should be expected, however, to generate a clean, perfectly modulated wide-band Hi-Fi audio RF signal well within the limits of the headroom available without pinching or clipping at the crest or troughs of the modulation envelope which can be later amplified with a class AB, RF power amplifier and is best heard or monitored on a good quality receiver equipped with a 6 kHz AM wideband filter and monitored on an oscilloscope.

The Asymod 7 is not an audio processor, but it does allow for full bandwidth control with the use of Pro Tools, a combination of rack gear, or a broadcast multi band compressor / limiter.

Audio processing and a high quality microphone is necessary for optimum performance.

Audio processing for mobile or base operation is possible with the use of the iRig PRE or iRig PRO interface using the companion IK Multimedia's VocalLive Vocal Processor app (not the free version) 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 Pro Tools for PC or Mac along with its companion interface such as the Mbox 2 Mini or newer. Pro Tools is the best choice and is highly recommended. Pro Tools sessions are free and available for download.

The Asymod 7 is NOT designed to give transceivers more RF power, more swing, or loud distorted modulation. It is however, to be used in conjunction with a properly set audio processing scheme to produce the loudness, punch, depth, and audio bandwidth with enhanced performance in tone, smoothness and dynamic range of a broadcast quality transmission which is what makes it stand out from the rest.

Features of the Asymod 7

Recently added features to the new and improved design of the Asymod 6 include on board passive and active selectable low pass filters which provide preset roll off points, remote control operation via the on board Solid State switch which provides mode switching for ease of installation in multimode transceivers. Enhanced RF suppression circuits have been added and board layout design has been optimized to eliminate and avoid any stray running currents due to RF interference. Single supply operation provides for a very low noise and quieter operation. New onboard unbalanced audio preamplifier with independent input and output to be used in any installation where audio levels need to be matched as it applies to the SSB Balanced Modulator input levels for eSSB operation or as a microphone preamp.

The Asymod 7 compact design allows for easy mounting inside your transceiver and offers all the combined features comparable to high end, very expensive broadcast gear and other available Hi-Fi mods upwards of $1000 and makes for the most important part of a Hi-Fi AM station. Hi-Fi Audio is very thought after by many radio operators nowadays and the Asymod 6 delivers all the necessary functionality and stands as the backbone of the station.

-Mobile or base operation, ease of use and simple installation; only a 12 Volt, 5 Amp power supply is required.

 

-Rugged design built on a tough PCB to provide years of continuous use.
 
-Audio gain control allowing for proper drive from the microphone and line level input.

 

-Modulation Level control allows for final audio control and is set in combination with the Carrier and Asymmetry controls to achieve the level on modulation desired.
 
-Carrier controls sets the reference carrier level (dead key) to set the modulation and asymmetry levels.

 

-The Asymmetry control maintains the negative peaks at -100% modulation while allowing for positive peaks of excess of 300% without pinching or clipping.

 

-Preamplifier gain control to allow matching of audio levels.

 

-Remote ON/OFF control.
 
-Power status LEDs for the 12V and onboard 24V supply.

 

-Input voltage polarity protected.

 

-Modulation peak indicator.

 

-Convenient mount holes.

 

-Heavy duty screw terminal block connectors for the line in, power in, modulator output, pre-in and pre-out connections.

 

-TO-220 and TO-247 onboard compatibility for mounting single or dual modulating stage transistors.

Asymod 7 absolute maximum ratings:

Audio input:

+4 dBu, 1.74 VPK  or  1.23 VRMS

Power supply:

 +15 volt supply @ 5A

Remote control sensitivity:

+8V ~ +12 V 

Asymod 7 Specifications: 

Audio Input Range:

Audio input: -30 dBu to +4 dBu
 
Frequency response:
Input: 20 Hz – 11 kHz.       Expandable to 20 kHz.
Output: 20 Hz – 11 kHz.    Expandable to 20 kHz.

Total System Distortion (@ 300% modulation):
<0.01% THD 20 Hz – 1 kHz
<0.02% THD 1 kHz – 5 kHz
<0.03% THD 5 kHz – 14 kHz
<0.05% THD 14 kHz – 24 kHz

Input & Output Passive Low Pass Filter:
Selectable: 5 kHz, 8 kHz, 11 kHz or 20 kHz

 

Preamplifier Active Low Pass Filter:
Selectable: 8 kHz, 16 kHz