Hi Joe,
> Joe <[EMAIL PROTECTED]> wrote:
> I decided to try the method someone suggested for
> keying the repeater transmitter encode PL on and
> off with active COS.
A very popular function to have working when using
remote IRLP or Echolink link radios.
> I switched the ground connection on and off to key
> the TS-32 PL deck.
Not a good practice...
> This works, except that when the tone turns off
> I get a sound that is best described as "squeege"
> as it shuts off. I assume this is the oscillator
> loosing voltage and the tone changing frequency.
> Anybody else have this problem?
There actually are/were tone burst circuits, which
depended on the above mentioned operation. I've got
some data sheets and circuit diagrams for them in
my files.
> I'm about to just go back to switching the PL
> audio line and leaving the TS-32 on all the
> time..
> 73, Joe, K1ike
Better to just leave power applied and mute the
encoder output using a portion of low pass filter
U3 circuit. Use a small fet like the 2N7000 or
the same VN10KM (also VN10LP) (same fet, different
number) with a low on-resistance to mute the audio
output line to ground at some place like the junction
of U3A parts R35-C21 - or the input to the U3A filter
atthe junction of parts R26-R27 & C20.
Ground one of the mentioned locations when cos changes
and the encoder output should halt.
cheers,
skipp
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