[SignalOne] CX-7 speaker F.S.

[parinc1]

Just saw this on QTH.COM:
https://swap.qth.com/view_photo.php?counter=1710233

Dale W4OP

________________________________
From: jerry <jerry at tr2.com>
Sent: Thursday, November 21, 2024 2:03 PM
To: wes Bolin <k5apl41 at gmail.com>
Cc: parinc1 <parinc1 at frontier.com>; Signalone <signalone at mailman.qth.net>; Signal One <signal-one at groups.io>
Subject: Re: [SignalOne] Color Me Stupid...

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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