From ras at isquare.com  Fri Jun 26 14:12:42 2026
From: ras at isquare.com (Robert A Sullivan)
Date: Fri, 26 Jun 2026 14:12:42 -0400
Subject: [SignalOne] CX-11A Issue
Message-ID: <5B8BC924-350F-40B4-B72C-12066C686DAA@isquare.com>

I?ve been working a CX-11A whose symptom was it would function perfectly for a few minutes (it would vary) then go ?dead.? After considerable troubleshooting the issue was isolated to the synthesizer board thanks to the extensive use of cold spray and a heat gun. It was impossible to identify the culprit although I could duplicate the symptom by using heat and cool in one area of the PCB. Replaced numerous components (including IC?s) to no avail.

Investigating the bottom of the board (with magnification) I saw tiny cracks on a couple of lands near one of the IC?s that ran quite hot (normal for the chip). Reflowing the solder in and around the IC solved the problem. (So far, so good). If the photo attaches you can see the long term of heat at one end of the board.

Put this in your ?it might happen to me? drawer.

73, Bob
W?YVA
Personal site: isquare.com <http://isquare.com/> 

?

From jerry at tr2.com  Fri Jun 26 17:40:50 2026
From: jerry at tr2.com (jerry)
Date: Fri, 26 Jun 2026 14:40:50 -0700
Subject: [SignalOne] CX-11A Issue
In-Reply-To: <5B8BC924-350F-40B4-B72C-12066C686DAA@isquare.com>
References: <5B8BC924-350F-40B4-B72C-12066C686DAA@isquare.com>
Message-ID: <bb81307739caa3a85f7007cf874ce3b5@tr2.com>

On 2026-06-26 11:12, Robert A Sullivan via SignalOne 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.
> 
*** hamanuals.com is alas gone.  But it was archived by W5OG.  You can
access it at www.signalone.org.

                 - Jerry, KF6VB