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That
circuit actually should work fine. All it is doing is reversing the logic
of your COS signal. When COS is present (+5V), 0V will be present at the output,
+5V will be at the output when COS is not present.
Richard, N7TGB
I have a question about logic circuits. I
have a Yaesu FT 1500 that has the data port on the back and I want to use the
1500 as a temporary receiver in my repeater while the acutal receiver is out
for repairs. Here is my problem, the data output port has a COS pin out
(Carrier=5 volts, none = 0 volts) My contoller port says, Receive COS (pull
this input low when receiving).
So I need to turn my positive logic signal to a
negative logic signal. I found this circuit to do the the opposite of
what I need ( http://www.repeater-builder.com/pix/cosswitch.gif
) Can I and if so how can I modify this to produce the positive logic with no
signal and negative logic when a carrier is present.
Or is my line of thinking completely out of
line?
Thank you.
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