[App_rpt-users] RTCM falsing DTMF

[Tim Sawyer]

I am one of those that found setting RADIO_RELAX off works much better. TT falsing has been reduced to near zero and decoding is still as fast as I can push the buttons. 

One thing I found was that I had to turn on the PL filter. Before I did that TT decoding was unbearably show with RADIO_RELAX off. 
--
Tim
:wq

On Jun 3, 2012, at 12:48 PM, Jim Duuuude wrote:

> This has nothing to do with the RTCM. The DTMF receiver is the same one that is used in all the other
> channel drivers for the other types of interfaces also.
> 
> When the app_rpt stuff was first being developed (10+ years ago), the default parameters
> for the DTMF receiver seemed too "tight" for radio use. There were a number of combinations
> that were found of receivers and transmitting devices (HT's mobiles, etc) that did not seem to
> work reliably with the parameters the way they were, so we developed the "RADIO_RELAX" set
> of parameters, which are more "relaxed" then the normal ones.
> 
> As time has gone on, there have been cases where using these "relaxed" parameters have seemed
> to do more harm then good. I dont know if your case is one of those. If you wish to try, I suggest
> re-compiling Asterisk with the RADIO_RELAX compile parameter turned off, and see if you like it
> that way better. I can guarantee you that you will have less "falsing" if you do that. What I can not
> guarantee is that you will get all the "real" digits decoded reliably (if you do that).
> 
> Jim WB6NIL
> 
> From: adamson_alan at hotmail.com
> To: app_rpt-users at ohnosec.org
> Date: Sun, 3 Jun 2012 15:26:06 -0400
> Subject: [App_rpt-users] RTCM falsing DTMF
> 
> ok, so is it normal for the RTCM to get false DTMF when voice is doing over the link?  I adjusted the RX audio so that the 2 lights were off with a 3khz tone generated from a service monitor.
> I see oh between 6-8 DTMF's detected over the voter channel during use…. How do you fix that issue?
> Alan
> 
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