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Adding Flat Transmit Audio to a 5-pin MaxTrac
https://www.repeater-builder.com/motorola/maxtrac/maxtrac-flat-tx-audio.html
MaxTrac/Radius Radios By Robert W. Meister WA1MIK The 16-pin logic boards already have a provision on the 16-pin Accessory Connector for microphone audio on pin 2 or flat TX audio on pin 5. The 5-pin logic boards have no external microphone audio input, so the only way to feed audio into these radios is to
Getting Discriminator (Flat) Audio Out of a MaxTrac 5-pin ...
https://www.repeater-builder.com/motorola/maxtrac/maxtrac-discr-audio.html
MHz MaxTrac radios will directly tune 935 MHz, however as I found out, not all MaxTracs are created equal. The computer programs that monitor and decode these signals need discriminator (or flat) audio. Only those radios with a 16-pin accessory jack can be configured to provide a discriminator audio output. Radios that have 5-pin accessory
Motorola MaxTrac / Radius / GM300 Index Page
https://www.repeater-builder.com/motorola/maxtrac/maxtrac-index.html
Getting Discriminator Audio from a 5-pin MaxTrac radio by Scott Withrow, KC9LQV MaxTrac and Radius mobiles with 5-pin accessory jacks are often overlooked because they lack signals such as discriminator (flat) receiver audio. Scott duplicated the circuitry from a 16-pin radio and added it to his 5-pin radio to get flat audio out of it.
Maxtrac connection notes - repeater-builder.com
https://www.repeater-builder.com/products/DVM_pdfs/Maxtrac_connection_notes.pdf
^ Ensure JU551 is in position "A" in Motorola Maxtrac style radios. # Only connect for RSSI on CDM series radios. STM32-DVM Signal Simplex Duplex TX Radio Duplex RX Radio 1 N/A 2 →→ TX Audio (Flat / 9600 Baud) →→ 5 5 3 ←← DVM Inhibit (Act. Low) ←← 8* …
Maxtrac and Radius Mobiles - BatLabs
http://www.batlabs.com/maxrad.html
The Maxtrac/Radius Series are 9600 baud packet capable. They do need a minor modification though. For RX, its no big deal, just take RX audio from PIN 11 of the Accessory Connector and swing JU551 to the (A) position (Flat RX Unmuted).
Maxtrac/GM300 Digital audio | RadioReference.com Forums
https://forums.radioreference.com/threads/maxtrac-gm300-digital-audio.230443/
Pin 5 is flat TX audio input. Pin 11 is RX audio output, type programmed by CPS. Pin outs are available at batlabs or repeater builder. In fact, all the answers to the questions you've been asking are already there for the reading.
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