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Author Topic: QYT KT8900 SQL or COS tap  (Read 956 times)
K9GRZ
Member

Posts: 11




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« on: September 26, 2017, 04:53:04 PM »

I need a SQL or COS signal and this radio doesn't provide it on either the data port or the mic.  Is there somewhere inside where I can tap in and bring out a line with this signal?  I could probably find it if I had a schematic, alas, I don't have one!

Thanks and 73
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K4JJL
Member

Posts: 797




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« Reply #1 on: September 27, 2017, 06:49:53 AM »

Does it have a busy LED?
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K9GRZ
Member

Posts: 11




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« Reply #2 on: September 27, 2017, 07:13:45 AM »

Unfortunately, no.  No busy LED.
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K9GRZ
Member

Posts: 11




Ignore
« Reply #3 on: September 27, 2017, 04:38:47 PM »

 Smiley
Well, well.  Never mind!  The manual (such as it is) is incorrect and pin 2 on the mic plug appears to be a SQL signal at +3 volts normally, drops to zero when a proper signal is received.

Using Menu 51, REP-M, one can set the "proper signal" to a simple carrier, CTDCS, Tone, or DTMF.  Or off if it's not being used (pin 2 is still at +3 volts even when this function is not being used).

It appears this gives me exactly what I was looking for.  Now to get it all wired up and see if it works.
 
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