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General Description
The Asymod 7 is the complete Hi-Fi solution to make your presence shine on the air! No doubt is the
right choice to sound pro & 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.
In addition to its predecessor’s functions, the Asymod 7 includes all the necessary options to control
your transceiver function signals and modes. It’s rugged SMD design provides auto divert for the RF
final’s VCC (Voltage Common Collector) and modulation feed path for easy installation in HF multi-band,
multi-mode transceivers. The built-in amp keyer with TX indicator allows keying RF amplifiers directly.
The SSB mute, automatically diverts audio from flowing into the Balanced Modulator when on AM. New
on-board remote power switch eliminates the need for an externally mounted transistor requiring heat
sinking. To allow for full potentiometer range for given transceivers preselect controls for carrier inject
and level have been implemented. JST connectors provide easy external connections and the new
auxiliary input provides simple connectivity for record / playback devices.
The Asymod 7 compact design makes it ideal for mobile or base operation and allows for internal
mounting and simple installation in the transceiver with the included hardware and only requires a 12
volt supply.
Improvements in the Asymod 7 include increased RF suppression, active audio filters, carrier
stabilization, zero crossover distortion, supply conditioning, auto mode switching, VCC/MOD divert and
on-board JST connectors for easy connection to external controls and connections.
The Asymod 7 is compatible with most transceivers and it is fully adjustable externally via the JST
connections or the onboard controls. It accepts line level input that can be configured to microphone
level to use a microphone directly if necessary. The auxiliary input accepts low level audio and its ideal
for recorder/playback devices or external audio source.
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. Low Level Modulation transceivers will require some modification. Instructions
for specific multiband HF transceivers is available upon request.
The Asymod 7 not only provides the Hi-Fi wide audio bandwidth but also allows for amplitudes in excess
of positive 300% modulation while not exceeding the negative peaks at negative 100%. The Asymod 7
produces positive modulation levels well above the norm and broadcast levels without distortion,
allowing for your station to sound loud and clean. With the Asymod 7 connected to your audio process
gear and a transceiver of your choice, your mobile or base station will sound just as or better than
commercial broadcast stations.
This manual is partially based on a Asymod 7 installed in a Stryker SR-955 HPC transceiver. These
instructions can be applied to most makes and models by following the general guidelines implied
