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An Analysis of the MaxTrac Audio "Click" When PTT Is Released

http://www.repeater-builder.com/motorola/maxtrac/maxtrac-click.html

Transmit Audio Circuit: Here's a portion of the MaxTrac transmit audio schematic. with the scope are flagged with a diagonal red line. Low-speed (PL/DPL) data runs through U701A and U701B. Microphone audio runs through the MIC Gate Q651, …

Variations in MaxTrac Receive Audio Level

https://www.repeater-builder.com/motorola/maxtrac/maxtrac-rx-audio-level.html

I begin with the MaxTrac's audio stages 1 through 3. Here is the same circuitry from the Radius manual. Now here's the rest of the MaxTrac's audio stages 4 through 6. And finally the rest of the Radius audio stages 4 through 6. I used the same input signal as above: 1,000 Hz tone at 3 kHz deviation. The important number is the one at the output ...

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

Maxtrac/Radius Audio Modification - BatLabs

http://batlabs.com/maxaudio.html

MAXTRAC/RADIUS AUDIO MODIFICATION This is a description of a modification to the transmit audio circuit of conventional Maxtrac/Radius radios. The purpose of this modification is to improve microphone sensitivity and make the frequency response more pleasing to the ear. This modification is intended for Amateur Radio use only.

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.

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