[TenTec] Omni 6 Plus: No RX or TX on 10 meters (Intermittent)

[k8mp at aol.com]

 I'm surprised by having to re-solder these boards also Jim. I would have thought that a bad connection would show up much sooner.


The first time I ran into it was on this same Omni 6 Plus which was already 11 years old at the time. The PLL board went wacko and one of the guys on the reflector insisted that hitting all the connections with an iron would fix it. I'm glad I listened to him cuz it turned out he was right.
If you're interested in the details, you can search on my call in the reflector archives.






-----Original Message-----
From: Jim Allen <jim.allen at longhornband.net>
To: Discussion of Ten-Tec Equipment <tentec at contesting.com>
Sent: Mon, Jul 6, 2015 8:47 am
Subject: Re: [TenTec] Omni 6 Plus: No RX or TX on 10 meters (Intermittent)

 
 
 
I'm glad you found the fix. 
 
Why is it there are so many re-solder fixes these days.  I don't recall ever  
hearing about resoldering on the old gear.  Anybody ever have to fix a 75A4 or  
SX101, etc. by resoldering some connections? 
 
73 de W6OGC Jim Allen  
 
Sent from my iPad 
 
> On Jul 6, 2015, at 7:39 AM, Joe Papworth via TenTec <tentec at contesting.com>  
wrote: 
>  
> It appears to be fixed and in repairing it, I fixed another annoying problem,  
which was spurs and floaters on ten meters only. Those had been plaguing me for  
several years. 
>  
>  
> First, thanks to Paul at Ten Tec for pointing me in the right direction and to  
Mark, K8VF, and others for their suggestions. 
>  
>  
> Paul was right. The problem was on the Xtal Osc/LO board. The repair process  
went like this: 
>  
>  
> 1) I looked at the schematic of the board and saw there are 4 separate xtal 
> ? ? oscillators for ten meters (I assume one for each 500 Khz band segment) 
> ? ? Since I was losing the entire band, I knew it wasn't one of those  
circuits.? 
> ? ? That eliminated a lot of circuitry as a possible cause. 
>  
>  
> 2) After reading the theory of operation, I pretty much narrowed things down ?  
? to the L9, L10, and L11 circuits, plus the Q4 and Q5 circuits. 
>  
>  
> 3) I resoldered every component in those areas and voila, no more spurs or 
> ? ? floaters and so far, RX and TX are fine. (I'm fairly certain the rig would 
> ? ? have failed?by?now) 
>  
>  
> Later, Joe 
>  
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