[App_rpt-users] Wiring a GM300 to a RTCM

[Sam Nabkey]

The GM300 either presents de-emphasized squelched audio or non
de-emphasized discrimator audio at pin 11 depending on the position of the
jumper inside the radio.

The squelch circuit inside the RTCM is superior to the squelch built into
to GM300.   Properly calibrated,  there isn't any burst.

I hooked pin 8 to the CTCSS pin on the RTCM so I can use the radios
decoder.  I also don't use the RTCM for encoding CTCSS.   I let the radio
do it.

Both those links should get you rolling.

Your mileage may vary...  Caution!  Beverage in this container may be HOT!!

Go have some fun!!
On Jun 20, 2015 8:30 AM, "R. Wayne" <allstar at controlservers.net> wrote:

>   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 <sam.nabkey at gmail.com>
> *Sent:* Saturday, June 20, 2015 5:06 AM
> *To:* R. Wayne <allstar at controlservers.net>
> *Cc:* Allstar app_rpt-users Group <app_rpt-users at ohnosec.org>
> *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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>
>
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