[App_rpt-users] RTCM falsing DTMF

[Sione Ragle]

How we go about making this change? I have been having this issue at all 
my sites.


On 6/3/2012 1:51 PM, Tim Sawyer wrote:
> 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 <mailto:adamson_alan at hotmail.com>
>> To: app_rpt-users at ohnosec.org <mailto: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 2lightswere 
>> 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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>
>
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