[SignalOne] Color Me Stupid...

[jerry]

I'm told that the glass-encased reeds can be replaced individually.
A quick search on Ebay unearthed a bunch of them.

                   - Jerry, KF6VB

On 2024-11-21 12:17, wes Bolin wrote:
> I have my CX7A back on the air again....this was a battle for me.
> 
> Found my problem.  To restate it, when the Time Delay Relay timed in,
> the S-meter would go well over S-9 in white noise and the heatsink
> would get very hot. I have learned a lot about T/R switching, and PA
> Bias, and what would make the Noise go away.  It
> turns out I have a stuck contact, E5, inside the Reed Relay.   I have
> cobbled around it by connecting the bias control lead from the Solid
> State Driver board (377) to a 33ohm resistor to the RLY contact on
> rear chassis.  It is grounded in PTT, and the radio is transmitting
> and
> receiving like it should again.  Final fix will be a small relay added
> inside the chassis. The original relays are probably unobtanium.
> 
> Hope it is back in its cabinet soon.
> 
> On Wed, Nov 20, 2024 at 4:50 PM parinc1 <parinc1 at frontier.com>
> wrote:
> 
>> 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.
>> 
>> .
>> 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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