[TenTec] Corsair II tuning

[Carlos]

Hi Paul,

It might be that somebody repaired the radio fitting a different Xtal to
the heterodyne oscillator (maybe the original one could not be sourced?),
as there are two combinations of VFO ranges that would convert the 40m band
into the 9 MHz IF. However, if they are using the other combination then
the IF spectrum would appear reversed and then the SSB BFO switch should be
placed in "SB-R" instead of "SB-N" (unless they have wired it accordingly
to the change). Or perhaps the band switch wafer that drives the heterodyne
VFO is broken and selects a different Xtal, or it was wired wrongly at some
point.

These are just theories. In any case, it reminds me of someone here in
Canberra who remembers having seen an Argosy with the same "feature" (the
PTO tuning knob direction was reversed)

Do you have a scope or a frequency counter, so you can identify which Xtal
is being used in the heterodyne VFO as you switch bands ?


73,
Carlos VK1EA



On Sunday, August 26, 2018, Paul DeWitte <k9ot at yousq.net> wrote:
> I am not sure how to explain my problem.
>
> I have 3 corsair IIs. recently I got one out to give it some air time. It
> had been a while since it had been used.
>
> When tuning in a signal on 40M I found that instead of turning the VFO
> CLOCKWISE to zero beat on a low pitch signal, I have to go down (counter
> clockwise) to get on frequencey. The offset tuning works the same way. I
> have to tune down to bring the signal up in pitch.
> That is exactly backwards of how TT radios work on 1.8 to 10 MHZ.
>
> Everything else seems to be correct. The frequency readout seems  to be
> correct as you tune up the band.It has good rcv audio, and this is the
only
> thing that I find wrong.
>
> Is there  a wiring problem here? In looking at one of the others, I do not
> see any difference in wire routing.
> Can it be the PTO?
>
> Thanks for any replies,
> 73 Paul K9OT
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