[arm-allstar] DTMF Recognition

[Patrick Perdue]

Oh yeah, I can tell you from experience that turning off all the filters 
tends to screw up DTMF recognition. Depending on the node radio, this 
may make it work zero percent of the time. I thought, as one of my node 
radios (baofeng) has a high pass filter anyway, and won't pass CTCSS to 
the network with filters disabled, it would be enough, but I noticed a 
lot of DC offset and other stuff when I tried that, and less reliable 
DTMF recognition.

FWIW, my Motorola Radius SM50, even with the steepest highpass filter on 
HamVoIP, definitely sounds fuller than the Baofeng, but this should 
probably not surprise you much. Flat output with no filtering feeding a 
software highpass rather than a filter stack, etc.
On 3/28/2020 4:52 PM, "Chris Smart via ARM-allstar" wrote:
> Thanks Doug.
>
> So I can't get away with PL and DCS filters off? I like the slightly 
> improved audio doing that, but maybe that's my problem?
>
> At 04:48 PM 3/28/2020, you wrote:
>> Chris,
>>
>>  Not sure why you are experiencing that but in general DTMF works 
>> fine on
>> most all radios assuming levels and equalization are correct. I use 
>> THF6's,
>> Baofengs, Yaesu mobile, etc and I never have any problems. You said 
>> levels
>> are at 500. That is a starting point and there is no reason it has to 
>> stay
>> there. Set the levels for the radios you are using trying to average
>> between highest and lowest level. All radios are a little different. Use
>> the Asterisk client to observe what is working and what is not. It 
>> displays
>> the decoded character as you key it. Make sure you have the PL or DCS
>> filter turned ON, DCS preferred and that the pre or de-emphasis is 
>> not on
>> if not needed.  Set the levels so that when you speak it peaks to 
>> 6khz or
>> so. The client will give you an idea what digits are not working.
>>
>>
>> *73 Doug*
>>
>> *WA3DSP*
>>
>> *http://www.crompton.com/hamradio <http://www.crompton.com/hamradio>*
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>
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