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

[Rick - DJ0IP / NJ0IP]

I had a 961 power supply crap out on me, right in the middle of a contest.
It was nearly 10 years old.
The problem was missing solder on one of the connections in the power
supply.
It had simply never been soldered.
I soldered it and it returned to life.

We have a saying in German that describes this best, but the translation
into English is a bit rough:

"There are things which don't exist."
(think about it)

73 - Rick, DJ0IP
(Nr. Frankfurt am Main)


-----Original Message-----
From: TenTec [mailto:tentec-bounces at contesting.com] On Behalf Of Joe
Papworth via TenTec
Sent: Monday, July 06, 2015 3:53 PM
To: tentec at contesting.com
Cc: k8mp at aol.com
Subject: Re: [TenTec] Omni 6 Plus: No RX or TX on 10 meters (Intermittent)

 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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