[TenTec] TT 238C will not tune

[Robert Mcgraw]

What's the antenna configuration?

Start with a dummy load on ANT 1, antenna switch in #1 position.  If that
doesn't work, either the input jumper is bad or someone has "monkeyed"
with the circuit.   An ohm meter check from input to output will confirm
the ANTENNA switch and HI/LO Z switches are good.

If you are using ANT 4, is there a jumper between the terminals on the
rear?  If so, that's only for balanced line.  Otherwise, without the
jumper #4 will feed a coax or unbalanced antenna.  The fixed caps at the
rear of the HI/LO Z switch will be two 220pf caps wired parallel for each
of the 4 positons. Visually confirm that the roller is actually turning
and the variable C is turning when you  turn the knobs.

I think most will agree that the tuner will match about anything hung on
the output if it is working correct.

73
Bob, K4TAX






> Hi all

> I recently purchased a used TT 238C tuner from TT and other than
> functioning correctly in the bandpass position, it will not tune my
> antenna system at all!
> I pulled the cover and can find nothing amiss

> It acts like the roller inductor is not in the system and the padding
> caps on the high z/low z switch are all not correct value.
> Visually it all looks pretty much like new on the inside.
> Will call Stan at TT early monday am and see what he says
good thing they
> warrant their equipment.
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Disclosure:
I am a Tentec Ambassador and compensated according to the Tentec
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