Problems solved!! Thanks guys for all your help. The problem was exactly that Eric wrote. I had a broken cap on the input to 8870 resulting with about 3 V DC. I changed the capacitor and then i worked perfect. I am going to hook the controller to a low level LF instead also :)
Thanks again, Merry Christman!! 73 de SM6URQ --- In Repeater-Builder@yahoogroups.com, "Eric Lemmon" <[EMAIL PROTECTED]> wrote: > > Christopher, > > I suspect that you are overloading the DTMF decoder by sending it speaker > audio; it is intended to work with very low-level audio. Try to find a > low-level audio source that is upstream of the volume control. It may be > necessary to de-emphasize the audio in order to keep the high and low tones > at equal values. > > There's another precaution to take, and that is to ensure that there is a DC > blocking capacitor in the audio feed to the decoder. Any DC bias from an > op-amp or similar circuit can upset the decoder's operation. > > 73, Eric Lemmon WB6FLY > > > -----Original Message----- > From: Repeater-Builder@yahoogroups.com > <mailto:Repeater-Builder%40yahoogroups.com> > [mailto:Repeater-Builder@yahoogroups.com > <mailto:Repeater-Builder%40yahoogroups.com> ] On Behalf Of Christofer Lind > Sent: Thursday, December 21, 2006 6:40 AM > To: Repeater-Builder@yahoogroups.com > <mailto:Repeater-Builder%40yahoogroups.com> > Subject: [Repeater-Builder] NHRC-2 DTMF Problems > > Hello to you all! > I bought the NHRC-2 controller Kit (Rev-E). My plan was to hook it up with > an ICOM IC-F410S. > Everything works fine, but i can not get the DTMF-decode to work. The audio > comes from Speaker-jack and i use NO deemphasis on the controller. > The MT8870 decodes some tones, mostly 0 and # (3 never works). I have tried > different levels from the radio with no success. The Audio output is very > good from the repeater, no distortion whatsoever. > Anyone has any ideas? > > Merry Christmas from Sweden > > de Christofer, SM6URQ >
