I'm pretty sure all of the CAT controllers have one
pot to adjust the input level to the DTMF decoder. I'd
have to check each of the manuals to be 100% sure. It
doesn't need to be "cranked way down", but it does
need to be adjusted properly and by using a radio that
transmits DTMF at the right deviation level. RTFM;
it's in there.
Telephone networks, where DTMF was designed, are a lot
more forgiving, but the tone level is regulated a lot
better, typically 0dBm with voice levels at -20dBm.
Thus TelCo DTMF decoders can ignore soft stuff.
Amateur radio runs 3-5 kHz on voice and 3-5 kHz on
DTMF, so the decoder has a lot more work to do when
trying not to decode a valid digit with voice input.
Bob M.
======
--- skipp025 <[EMAIL PROTECTED]> wrote:
> One possible/probable fix...
>
> If there's a level pot (control) to the DTMF Decoder
> section
> within the controller... crank it way down in value.
> The
> combination of extra hot audio with other unwieldy
> events
> confuse the decoder into false detection.
>
> Like the famous political banner "it's the economy
> stupid"....
>
> In your case "it's the audio level"
>
> Now back to the economy...
>
> cheers,
> s.
>
> ps: If there's no specific audio pot/control for the
> DTMF Decoder
> you will/may need to reduce the main controller
> audio input or
> mod the controller internal audio path circuit to
> reduce the
> value sent to the decoder section to a more
> reasonable level.
> I use a simple audio leveler circuit where required.
>
>
>
> > "Tony L." <[EMAIL PROTECTED]> wrote:
> > The DTMF muting feature on one of our CAT-1000
> controllers occasionally
> > falses and sends cover tone over a user's voice.
> This happens to one
> > user more so than anyone else.
> >
> > Is there an adjustment? Why does this happen on
> only one of 3 idential
> > controllers?
> >
> > Thanks.
____________________________________________________________________________________
Be a better friend, newshound, and
know-it-all with Yahoo! Mobile. Try it now.
http://mobile.yahoo.com/;_ylt=Ahu06i62sR8HDtDypao8Wcj9tAcJ
