[App_rpt-users] Wiring a GM300 to a RTCM

[R. Wayne]

But, but, but... it helps to know the words to google! I googled RTCM GM300 and didn’t get the links you did. But I’m here to learn!

Not sure of this line.

GM300 Pin 11 - RTCM Pin 3 - Rx Audio JU 551 inside the GM300,  in position A gives FLAT (not De-emphasised) audio out pin 11.We want to use the RTCM's internal Squelch.

So pin 11 on the GM300 already has the flat audio we seek. But Jumper 551 to the A position is the best audio? OK. Buy why the RTCM’s squelch? I know that we’ve had problems with squelch tails...

From: Sam Nabkey 
Sent: Saturday, June 20, 2015 5:06 AM
To: R. Wayne 
Cc: Allstar app_rpt-users Group 
Subject: Re: [App_rpt-users] Wiring a GM300 to a RTCM

Hello.. 

GM300 Pin 11 - RTCM Pin 3 - Rx Audio JU 551 inside the GM300,  in position A gives FLAT (not De-emphasised) audio out pin 11.We want to use the RTCM's internal Squelch.

GM300 Pin 8 - RTCM  Pin 4 - CTCSS Input
GM300 Pin 5 - RTCM Pin 2 - TX Audio
GM300 Pin 3 - RTCM Pin 7 - PTT
GM300 Pin 7 - RTCM Pin 9 - Gnd

RTCM Info - http://www.micro-node.com/thin-m1.html
GM300 Info- http://www.batlabs.com/gm300.html

Google is your friend.  

Have fun!!!  



On Sat, Jun 20, 2015 at 1:48 AM, R. Wayne <allstar at controlservers.net> wrote:

  I’ll confess that I am new to this part. It was dumped on me without warning and that’s OK. Time to learn a few things. I have a GM300 that is going to be a remote base and a cable purchased from eBay that is prewired for the GM300 side. I understand (I think) that TX goes RX, RX goes to TX, GRND to GRND – but now for PTT, COR and CTCSS. I wonder if some could push me over a cliff – I mean in the right direction. I have no documentation on the RTCM.

  Thanks, R. Wayne

  The RTCM connections are:

  DB9-Female

  1 Vin (12v)
  2 TX Audio
  3 RX Audio
  4 CTCSS
  5 GND
  6 GND
  7 PTT
  8 GND
  9 GND

  The GM300 cable (and radio) connections are:


  Pin #

  2     MIC                                          BLU
  3     PTT                                           WHI-BLU
  4     PROGRAMMABLE OUTPUT     BRO
  5     FLAT TX AUDIO                        GRN
  7     GROUND                                  WHI-GRN  
  8     PROGRAMMABLE I/O (COR ?)ONG
  11   RECEIVE AUDIO                       WHI-ONG
  14   PROGRAMMABLE I/O              WHI-BRO
  15-16  Jumpered to enable internal speaker

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