Hi Ted and Stan, It all started with new hams and old 2-meter rigs w/o PL. I bought a couple of TD-1 Ramsey Kits to get the Hams into the local repeater. The kits were not stable so we started to experiment, thinking it would be nice to improve on the CTCSS Tone filter in the TS-32 which we have many of, and build a encoder/decoder board with the new and improved filter on it. There are several enc/dec units available, we just thought it may be fun to build a few boards and save a few bucks, but found the 567 didn't work like many articles said it should. We then started looking for JUST THE ENCODER/DECODER chips, but it appears that most chips are from the UK. Just experimenting guys.
On Thu, May 6, 2010 at 10:55 AM, Stanley Stanukinos <ka5...@swbell.net>wrote: > > > I must be missing something, there are several MFG of encoders/decoders > still around. You are correct on the stability issue. You will find it much > less frustrating to just buy off the shelf or get the one for your radio > than trying to build one that is stable. Oh there is the cost of the new > ones so that has to be figured in. > > > > Stan > > > > *From:* Repeater-Builder@yahoogroups.com [mailto: > repeater-buil...@yahoogroups.com] *On Behalf Of *James > *Sent:* Thursday, May 06, 2010 9:36 AM > > *To:* Repeater-Builder@yahoogroups.com > *Subject:* [Repeater-Builder] CTCSS Encoder/Decoder > > > > > > Hi Guys, > > We have been experimenting with building CTCSS Units using the 567 Tone > Chip and good components, i.e. Caps, multi turn pots etc. The stability is > not good in my opinion. We will set it to 107.2 and the next time you check > it is off enough to where it won't decode until it is re-tuned slightly. I > am wondering what your experiences may have been with this CTCSS Chip. Many > articles say they work well with the addition of a stable voltage regulator, > so we added a five volt regulator, no difference in stability. Any comments > and experiences with this and other chips would be appreciated. The > availability of CTCSS Chips seems limited. > > > -- Jim Cicirello 181 Stevens Street Wellsville, N.Y. 14895 (585)593-4655
