Gm300 Discriminator Audio

Maxtrac/GM300 Digital audio | RadioReference.com Forums

https://forums.radioreference.com/threads/maxtrac-gm300-digital-audio.230443/

Yes I have. You can use flat discriminator audio dumped to a flat transmitter input. A simple COS will turn the transmitter on for any signal present at the receiver. Dstar audio will work this way. Also any PL or DPL present on the receive signal will be passed on to the transmitter. Be aware that this works well with full quieting signals.

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.

Motorola MaxTrac, Radius and GM300 Series …

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

Delta168: Connection to Motorola GM300

https://delta168.blogspot.com/2011/01/connection-to-motorola-gm300-8-channel.html

Discriminator Audio Output 12. Programmable I/O 13. Switch A + Sense 0.5A Max 14. Programmable I/O 15. Internal Speaker Positive 16. External Speaker Positive Above are the Pin-outs of Motorola GM300 Accessory connector. This connector can be ordered through Motorola dealers. Hardware Kit that includes 16 connector pins, and housing - Kit #HLN9457

Motorola GM300 Information Page - QRZCQ

https://qrzcq.com/pub/RADIO_MANUALS/MOTOROLA/MOTOROLA--GM-300%20Information%20Page.pdf

GM300 mobile radios cover the VHF (136-174 MHz in two ranges) and UHF (403-520 MHz in four ranges) bands, with 8 or 16 channels, 12.5 or 20/25/30 kHz channel spacing, and 10, 25, and 35-45 watt power levels. They use the same accessories (loudspeakers, microphones, accessory plugs, power cords, mounting brackets, etc.) as the MaxTracs.

delta99: Accesories pin out motorola gm 300/338 - Blogger

https://delta2199.blogspot.com/2014/06/accesories-pin-out-motorola-gm-300338.html

Discriminator Audio Output 12. Programmable I/O 13. Switch A + Sense 0.5A Max 14. Programmable I/O 15. Internal Speaker Positive 16. External Speaker Positive Above are the Pin-outs of Motorola GM300 Accessory connector. This connector can be ordered through Motorola dealers. Hardware Kit that includes 16 connector pins, and housing - Kit #HLN9457

[email protected] | GM300 on a MMDVM Board

https://radios.groups.io/g/RadioDoctor/topic/gm300_on_a_mmdvm_board/43272498?p=,,,20,0,0,0::recentpostdate%2Fsticky,,,20,2,20,43272498

[email protected]> wrote: I setup a GM300 for use with an MMDVM board on Brandmeister DMR service. He apparently likes to listen in on one of the popular talk groups (TAC310) and left that talk group active for a few days. The radio was probably. transmitting at a 80% duty cycle for most of that time.

Interfacing Repeater Builder STM32-DVM with Motorola …

https://forum.pistar.uk/viewtopic.php?t=2404