[arm-allstar] Kenwood TH-D74 DTMF troubles

[Rick Wilson]

The other variable may be the length.  It may send the entire time you hold the button down or, it may only send for a prescribed length of time.

Most decoders can handle down to 50ms but, the original BellCore standard was 100ms minimum.  Check if there is a tone length setting in the radio.

Rick, wd5etd



> On May 17, 2018, at 11:25 AM, wb9rsq--- via arm-allstar <arm-allstar at hamvoip.org> wrote:
> 
> I use a THD74 and all 16 tones decode perfectly and consistently.
> In fact I use it as my primary back up control since my Icom radios don't
> always work as well.
> I have loaded several command sequences in to tone memory on the HT and they
> fire and decode correctly.
> The audio on the HT is certainly higher then that from the THF6A as far as
> microphone audio but the tones sound about the same.
> I'm not sure if the internal mic gain on the 74 would also change the tone
> level, I didn't test.
> However there are three levels for internal mic gain.
> There are settings for duration and tone spacing for firing the command
> sequences from memory.
> However if manual entry is failing that's not going to matter.
> Maybe narrow FM would decode better.
> It does sound louder on some receivers so maybe your node would hear the
> difference.
> I swapped out a Motorola radio for a DR1x and noticed no difference in tone
> decode performance.
> My interface is a URI.
> 
> 
> 
> -----Original Message-----
> From: arm-allstar <arm-allstar-bounces at hamvoip.org> On Behalf Of "Lloyd Duck
> via arm-allstar"
> Sent: Thursday, May 17, 2018 11:07 AM
> To: 'ARM Allstar' <arm-allstar at hamvoip.org>
> Cc: Lloyd Duck <lduck at me.com>; 'Doug Crompton' <wa3dsp at gmail.com>
> Subject: Re: [arm-allstar] Kenwood TH-D74 DTMF troubles
> 
> Doug,
> 
> I've moved the RX levels all around to try and get it to decode. Best I get
> is a decode of *, 4, 7 and 8 no other dtmf numbers or letters will decode
> from the Kenwood TH-D74. 
> 
> I did check the level compared to the Icom ID51 and Yaesu FT2D and the
> Kenwood is a little lower but not by much.
> 
> Fob's I'm using RB-USB RIM RIM-RC21-/RLC on the Arcom 210 controller on one
> node and RIM-Maxtrac on a CDM-1250 for the other node I've tested.
> 
> I get the same results for the TH-D74 dtmf on both.
> 
> Mike,
> I double checked the setting in the Kenwood and mine are matching yours. 
> 
> I'm just trying to send dtmf *82 to say the time. 
> 
> -----Original Message-----
> From: arm-allstar <arm-allstar-bounces at hamvoip.org> On Behalf Of "Doug
> Crompton via arm-allstar"
> Sent: Thursday, May 17, 2018 10:24 AM
> To: ARM Allstar <arm-allstar at hamvoip.org>
> Cc: Doug Crompton <wa3dsp at gmail.com>
> Subject: Re: [arm-allstar] Kenwood TH-D74 DTMF troubles
> 
> LLoyd,
> 
>   did you check levels on the D74 vs. the other radios? It is possible the
> DTMF levels are significantly different. The pre/deemphasis setting is based
> on your node radio's requirements. What is your node radio? FOB?
> 
> 
> *73 Doug*
> 
> *WA3DSP*
> 
> *http://www.crompton.com/hamradio <http://www.crompton.com/hamradio>*
> 
> 
> 
> On Thu, May 17, 2018 at 10:46 AM, "Lloyd Duck via arm-allstar" <
> arm-allstar at hamvoip.org> wrote:
> 
>> Has anyone else had trouble decoding dtmf from the Kenwood TH-D74?
>> 
>> 
>> 
>> I've tried it on two different nodes and neither one will decode very
> well.
>> 
>> Icom, Yaesu and Kenwood mobile and HT's work on both nodes, just not 
>> the TH-D74.
>> 
>> 
>> 
>> It will decode *, 8's just nothing else. I've even tried multiple 
>> TH-D74's with the same outcome.
>> 
>> 
>> 
>> I do have TX/RX EQ turned off on the TH-D74 and on both nodes I've 
>> tried toggling the PRE and DE emphasis with no luck.
>> 
>> 
>> 
>> Anybody have a suggestion?
>> 
>> 
>> 
>> Lloyd Duck, W5LND
>> 
>> 
>> 
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