[SignalOne] Color Me Stupid...

[parinc1]

Congrats Jerry,
Another CX-7 made operational. I would think the keyer may be the simplest of all the issues you have found. Hope I am not jinxing you.
Dale W4OP
________________________________
From: signalone-bounces at mailman.qth.net <signalone-bounces at mailman.qth.net> on behalf of jerry <jerry at tr2.com>
Sent: Wednesday, November 20, 2024 2:39 PM
To: Signalone <signalone at mailman.qth.net>; Signal One <signal-one at groups.io>
Subject: [SignalOne] Color Me Stupid...



This list is for discussions regarding collecting, repair, use and sale of Signal/One radios and accessories.

Documentation on Signal/One radios can be found at http://www.hamanuals.com and several other sites on the Web.

.
Having gotten SSB transmit working, I turned my attention to CW.  By
voltage measurements, I had found a bad
NPN bipolar transistor that tells the MOSFET audio switch to pass the
sidetone.

That transistor turned out to be Q7 in....

...can you guess it? ....

...THE RF DRIVER BOARD...

Which I had just reinstalled :).

I *knew* which transistor it was, and I *knew* which board it was on

...But I had forgotten.

OK, let's schlep that board out yet again.

Replaced the transistor with a 2N3904.

Now CW works fine with a hand key.  The keyer is for some reason INOP.
Even though it used to work.

Well, as I always used to say "Everything works until it stops working".
  There's a story behind that.
Maybe some other time.

                  - Jerry, KF6VB


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