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MOTOROLA GM300 AUDIO PROBLEM | RadioReference.com …
https://forums.radioreference.com/threads/motorola-gm300-audio-problem.394888/
MOTOROLA GM300 AUDIO PROBLEM. Thread starter TA5FW; Start date Sep 22, 2019; Status Not open for further replies. TA5FW Member. Joined Mar 10, 2008 Messages 9 Location TURKIYE. Sep 22, 2019 #1 Hello, Using the RICK from the Motorola GM300 UHF devices, I did the repeater. I've detected that the RX receiver radio has a sound problem.
GM300 repair with 2 more defects|Gm300 no audio - …
https://www.youtube.com/watch?v=VO5E5rNU22Y
Repairing GM300 with 2 more defectsNo displayNo Receive audioMalfunction Volume Ctrl.Troubleshooting with step by step tutorial#GM300 Repair#Motorola GM300#R...
GM300/M120 - BatLabs
http://batlabs.com/gm300.html
The GM300 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).
Motorola GM300 Information Page - QRZCQ
https://qrzcq.com/pub/RADIO_MANUALS/MOTOROLA/MOTOROLA--GM-300%20Information%20Page.pdf
The GM300 audio amplifier drives both sides of the loudspeaker. Therefore you must NOT ground either pin 1 or pin 16 of the accessory connector. You must run two wires to an external speaker. The same circuit design and components are used on the Spectra radios and they suffer from the same restriction.
GM300 Information Page - Repeater Builder
https://www.repeater-builder.com/motorola/maxtrac/gm300-info.html
For comparison, here's the inside view of a MaxTrac. Notice the lack of shielding and no filter board between the logic board and control head. The GM300 logic board is significantly different from the MaxTrac logic board. It can control the RF board's local/DX circuit. The audio power amplifier is one single IC rather than discrete transistors.
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