Re: Reverse Burst Comments (Com Spec RB-1)
If you add a circuit like the Com Spec RB-1 board to the typical
repeater system using a ts-32/ts-54 board... the tx ctcss is not
disabled or removed before the RB-1 delayed ptt line drops.
So you have the phase inverted ctcss present for at most up
I haven't used one of those, but I'd ask, what is it doing differently?
If you invert the phase of the tone 180 degrees (or 120 for some older
motorolas), it should mute correctly. The only issues I've ever run into
is either the transmit delay is too short (ie, TK-x05D series), and the
rx
I have changed the subject of this thread, since it now has nothing to
do with TKR repeaters.
TIA/EIA-603-B, the international standard of the Land Mobile Radio
industry, defines two STANDARD formats for CTCSS Reverse Burst: 1) A
shift of 180 degrees for 150 milliseconds; and 2) A shift of 120
Comm Spec or Selectone used to make a simple
(and cheap) reverse burst board that worked
well. PC board about the size of a postage
stamp square.
My last conversation with with the factory
said they didn't make enough money on them
to keep production going, but they were able
to supply me
skipp025 [EMAIL PROTECTED] wrote:
SNIP
to supply me with diagram for the RB-1 I
obtained second hand. Might be time to dig
that diagram out and make it available.
Be aware, about 10 years ago I did some modifications
to the RB-1 board (to meet some special needs I had
for the timing
If somebody will email me a good scan of the RB-1 paperwork,
and if John can send me the reverse-engineered schematic I'll
combine them and make a web page and add it to the Com-Spec
page on www.repeater-builder.com
Mike WA6ILQ
At 02:47 PM 12/20/03 -0600, you wrote:
skipp025 [EMAIL PROTECTED]
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