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
On 5/6/2010 10:35 AM, James wrote:
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
Many many years ago when I was finishing college
electronics, my final year project was a repeater
controller. The danged thing worked really well,
I used 567s for the DTMF decoding, but they
really drifted around with temperature. Took
about an hour to stabilize, and then still needed to
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
At 07:55 AM 5/6/2010, Stanley Stanukinos 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
Anyone got any FX-805J or MX-805J in the PDIP package?
I built a 1000 Hz decoder once based on the 567, it would swing
between 950-1070 depending on the mood it was in.
The ATV guys use these to create a video squelch, looks at the
frequency of the horizontal sync which is 15,374 Hz. Work fairly
Waste of time and effort. Very old technology that never worked well.
Chuck
WB2EDV
- Original Message -
From: James ka2...@gmail.com
To: Repeater-Builder@yahoogroups.com
Sent: Thursday, May 06, 2010 10:35 AM
Subject: [Repeater-Builder] CTCSS Encoder/Decoder
Hi Guys,
We have been
Remember the Heathkit touchtone microphone
for the 2036? Didn't it use 555s?
Sorry for the rocky walk down memory lane!
Tim
Grab an old Standard HX300 or C734 etc. off ebay for practically nothing(if you
find one) the enc/dec board is a plug in w/wire leads, very small, dip select,
and rock solid. I have one kickin around with the schematic if your interested.
I have adapted these to many old crap radios and they
At 5/6/2010 08:22, you wrote:
At 07:55 AM 5/6/2010, Stanley Stanukinos 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
I would look for something else. About 30 years ago I used some for a DTMF
decoder for an autopatch on a repeater. They were stable enough for that.
There was a problem with the input amplitude to them. Seems that very small
changes in the input voltage of the tone comming to them would
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