I have re-soldered several Paragon PLL boards and I
believe the problem is related to the way temperature
changes affects the board. I think the modules which
are soldered to the board cause stress on the joints
during temperature changes. That would also explain
why some radios have not had the problem, they could
be in a more stable environment temperature wise. Also
I haven't seen soldering problems on many other TT
boards.
Just my 2 cents worth (1&1/2 cents US).
Dave, VE1ADH
--- Michael Tope <W4EF@dellroy.com> wrote: > Yes, in
fact I was already through the PLL problem
> about
> two years ago. First it was the low frequency VCO
> that
> started phase popping (noticed it on 75 meters).
> Then
> later it started with mid range VCO (I think thats
> the one
> that covers 7 MHz and up). I pulled the Major Loop
> PLL
> board out and reflowed all the solder connections
> around
> the VCO's. Since doing the reflow, I've had no
> problems
> for the last two years (knock on wood). Didn't know
> it
> was a known problem at the factory.
>
> 73 de Mike, W4EF..........................
>
> ----- Original Message -----
> From: "Robert & Linda McGraw K4TAX"
> <RMcGraw@blomand.net>
>
>
>
> > For whatever reason, Tentec seemed to have a
> solder problem with the PLL
> > boards. I seem to recall that one of the often
> offered solutions was to
> > "touch up" each of the solder connections on the
> PLL boards.
> >
> > I suspect that the use of copper non-plated boards
> in earlier Tentec
> > products allowed oxidation to occur to the traces
> and pads while these
> > boards were in storage prior to component
> mounting. Without a very
> rigorous
> > cleaning prior to soldering, bad connections could
> exist even though the
> > outside solder looked quite acceptable and the
> boards appeared to accept
> > solder.
> >
> > 73
> > Bob, K4TAX
>
>
>
>
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