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

[A R]

Welcome to the lead-free world of RoHS. Your spools of 60/40 solder are NOT RoHS-compliant...but will likely improve reliability of solder connections which are subjected to the stresses of expansion/contraction of dissimilar materials due to thermal excursions. Sn-Pb is more ductile, and as a result more tolerant of the thermal excursion stresses, than the RoHS-compliant solders. 

 

73,

Allen--W7GIF


----- Original Message ----- 

From: Jim Allen<mailto:jim.allen at longhornband.net> 

To: Discussion of Ten-Tec Equipment<mailto:tentec at contesting.com> 

Sent: Monday, July 06, 2015 5:46 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<mailto: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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