[App_rpt-users] RTCM transmit adjustment

[Jesse Lloyd]

I set the rx up so it reads 3 Khz deviation on the RTCM's built in console meter, then set the tx level so I get 3Khz out of my transmitter. (No PL)

I then change from 1khz tone to 800hz followed by 1.8 Khz and verify that the levels dont move as tone frequency changes. Changing levels indicates a pre/de emphasis issue.

If using PL you have to account for that deviation, unless you filter if you with your IFR. 

Cheers,
Jesse

> On May 10, 2016, at 10:00 AM, James Cizek <james.m.cizek at gmail.com> wrote:
> 
> Hi all,
> 
> 
> For those of you using RTCMs on your repeaters....  I was wondering what procedure you use to set the TX level on your RTCM.  There are great tools built into the RTCM/Allstar for setting squelch and RX levels, but TX is left pretty much to your imagination.
> 
> Curious how folks are going about this.  On the hardware-only path controllers (SCOM, Arcomm, etc...)  it's very clearly documented about how they'd like you to set levels throughout the audio path. There is even reasonably good documentation for setting TX levels with a URIx. The RTCM, not so much.  
> 
> I've got a few of the RTCMs deployed now and things sound really good, but I am following my own made-up procedure based on what I think it should be.  Got to wondering how others are doing it and if I could improve my methods any.
> 
> Thanks for sharing!
> 
> James
> KI0KN
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