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8-pin Speaker Mic Microphone for Motorola GM300 …
https://www.amazon.com/Speaker-Microphone-Motorola-MAXTRAC-CDM750/dp/B00IA9MCUO
8-pin Speaker Mic Microphone for Motorola GM300 GM338 GM950 MAXTRAC CDM750 Radio TITAN BRAND - TITAN TESTED - TITAN APPROVED 1 YEAR WARRANTY CUSTOMER SUPPORT - SHIPS IN 24 HOURS - ALL PRODUCT FRESH - WORLDWIDE SHIPPING Titan is a registered trademark with the United States Patent and Trademark Office.
Amazon.com: Speaker Mic for Motorola GM300 SM120 …
https://www.amazon.com/Speaker-Motorola-GM300-CDM1250-Mobile/dp/B005WZNQ22
Speaker Mic for Motorola GM300 SM120 M1225 CDM1250 Mobile Radio Can work as replacement for model HMN3596A, HMN1035, HMN1036 or HMN3413 Mic clip hanger and 2 screws are included
Bogen MBS1000A Microphone Motorola GM300 | QRZ …
https://forums.qrz.com/index.php?threads/bogen-mbs1000a-microphone-motorola-gm300.400942/
The GM300 takes a mic with a built in preamp, IOW the level needs to be pretty high, around a volt P to P of audio. The Bogen is a low impedance non-amplified mic.
Motorola MaxTrac, Radius and GM300 Series Introductory ...
https://www.repeater-builder.com/motorola/maxtrac/maxtrac-intro-stuff.html
All are covered in the Motorola Touch-Code Encoder Microphone instruction manual 6881114E07, which as of this writing (mid 2009) is still available from Motorola Parts for about US$3. The model tables in the manual mention fifteen different DTMF mikes, including the HMN3013A used on the trunked MaxTrac/Radius/GM300, and the HMN1037A used on the ...
Motorola GM300 Information Page - QRZCQ
https://qrzcq.com/pub/RADIO_MANUALS/MOTOROLA/MOTOROLA--GM-300%20Information%20Page.pdf
The M120 radio is just about the same as a GM300 but has "less features" - this would be the 2-channel version, equivalent to a MaxTrac 50. Here's a front view photo of a 16-channel MaxTrac, a 16-channel GM300, and a 2-channel MaxTrac: Maxtrac Index Motorola index Home page Motorola GM300 Information Page By Robert W. Meister WA1MIK
GM300 Information Page - Repeater Builder
https://www.repeater-builder.com/motorola/maxtrac/gm300-info.html
The audio power amplifier is one single IC rather than discrete transistors. The heat-sink is considerably different and mounts only to the bottom of the chassis - no more T8 flat-head screws through the side of the chassis. There are far fewer components on the board too. All GM300 logic boards have a 16-pin accessory connector.
GM300/M120 - BatLabs
http://batlabs.com/gm300.html
9600 Baud Packet Modifications. 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).. For TX audio, you will have to run a jumper to the junction of R223, C228, R222 on the RF board to inject the data …
Two-Way Radio Mobile Microphones - Motorola Solutions
https://www.motorolasolutions.com/en_us/products/two-way-radio-accessories/audio-accessories/mobile-microphones.html
Transmit clear audio with our portfolio of mobile microphones. From lightweight to durable, these microphones allow you to communicate effortlessly while driving. When paired with a footswitch push-to-talk button, visor microphones provide completely hands-free communication.
Motorola Two-WayPortableandMobileRadio
https://www.motorolasolutions.com/content/dam/msi/docs/business/products/two-way_radios/portable_radios/small_business_portable_radios/cp125/_documents/static_files/discontinued_radio_accessories_-_business_and_commercial_radios.pdf
GM300 Motorola Two-WayPortableandMobileRadio Accessory and Battery Catalog For Discontinued Two-Way Radio Models. exceptionaldependability ... PMMN4013A Remote Speaker Microphone with 3.5mm audio jack PMMN4029A Remote Speaker Microphone, IP57 Submersible HKN9094A Replacement Coiled Cord for legacy HMN9030A.
eHam.net
https://www.eham.net/reviews/view-product?id=1756
I use the GM300's as link radios and as repeaters. They work great. The have great transmitt audio and receive audio. The 16 pin plug in the back is ideal for tapping into COR, squelch, mic audio and speaker audio as well as "flat" audio and discriminator audio and a host of other features and be able to connect that to a repeater controller.
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