[App_rpt-users] RTCM CTCSS Output Tone

[Peter Elke]

Hi Alan,

 

The radio will need to decode the PL on an RTCM.  It has two logic inputs COS and CTCSS.  There is not software decode. There is an encoder for local repeat if the IP link dies.

 

Pete

 

 

From: app_rpt-users-bounces at ohnosec.org [mailto:app_rpt-users-bounces at ohnosec.org] On Behalf Of Alan Adamson
Sent: Monday, June 18, 2012 3:35 PM
To: 'Jim W7RY'
Cc: app_rpt-users at ohnosec.org
Subject: Re: [App_rpt-users] RTCM CTCSS Output Tone

 

I sent this direct and then realized maybe I'd get educated if I sent it to the list.

 

I didn't think the RTCM did CTCSS *decode*, the instructions suggest that it does squelch, but the setup there says to set it high so it doesn't false, to get CTCSS, you would need to get it externally and attach it to the CTCSS pin?  Or am I missing something… I can't find any settings for the voter.conf or the RTCM setup to tell it which PL to decode for example?  So I'm thinking it goes not do decode…. Allstar however does to encode if applying the audio to the modulator directly…

 

Alan

 

From: Jim W7RY [mailto:w7ry at centurytel.net] 
Sent: Monday, June 18, 2012 3:20 PM
To: Alan Adamson
Cc: app_rpt-users at ohnosec.org
Subject: Re: [App_rpt-users] RTCM CTCSS Output Tone

 

Alan... You miss understand...

 

I WANT the RTCM to generate my PL so I can use chicken burst on my non Motorola branded radios. I DON’T like squelch bursts  !

 

As for your COS issue... Don’t use COS. Let the RTCM handle it. Just put discriminator audio into the RTCM. Also let the RTCM decode your PL tone too. It it’s as good as the URI, you have no worries! 

 

My plan is to us a pair of GP-300s  (P110s) to make a repeater using the RTCM as a repeater controller. 

 

73

Jim W7RY

 

 

From: Alan Adamson <mailto:adamson_alan at hotmail.com>  

Sent: Monday, June 18, 2012 12:07 PM

To: 'Jim W7RY' <mailto:w7ry at centurytel.net>  

Subject: RE: [App_rpt-users] RTCM CTCSS Output Tone

 

Jim, when you get done, you have *got* to share :)…

 

Can't you just program the GP300 to TX with the PL tone and not worry about the PL from the RTCM?  Is the issue that you are not going into the modulator, you are going into the mic input, so the PL gets whacked or distorted?

 

I run an RTCM on my repeater, but I let the repeater TX do the PL encode,  I just put audio into it from the RTCM

 

Alan

 

From: app_rpt-users-bounces at ohnosec.org [mailto:app_rpt-users-bounces at ohnosec.org] On Behalf Of Jim W7RY
Sent: Monday, June 18, 2012 3:03 PM
To: app_rpt-users at ohnosec.org
Subject: [App_rpt-users] RTCM CTCSS Output Tone

 

Just received my RTCM!  Whoo Hoo!  Have a question though. 

 

The PL tone output is also the transmit audio output. With my USB fob, I used both channels of the TX out, one for PL and one for audio. This worked perfectly for a Motorola Mitrek. Now I will be using a GP300 or P110 for a transmitter and would really like to separate the PL tone output from the audio output. 

 

What have others done? Will a 16 pin GM300 take PL into the microphone input? 

 

Or are you running the RTCM transmit audio into the flat audio input of the radio?  Does the radio provide deviation limiting with this setup? I don’t think it does. 

 

Thanks!

73

Jim W7RY

 

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