Ken,
Having refurbished and tuned a number of those cavities, I
would suspect it may not be getting a good low resistance
contact between the end of the coupling loop and the inside
of the cavity. I would suggest taking it apart and
thoroughly cleaning the inside of the cavity... especially
the contact surface areas where the loop meets the cavity.
Paul
On Saturday 01 May 2004 08:03 pm, Ken Arck wrote:
> Hi kids
>
> I'm tuning up a T1504A, which has the 430 - 470 cable set
> on it. Everything looks good, except for one cavity - one
> of the lowpass/hi reject ones. I can't seem to get a very
> good null on it, regardless of the loop position. As a
> matter of fact, the reject seems to be "getting better"
> when it runs up against the outside edge of the
> adjustment slot. But I never find a definate point. The
> other 3 cavities are great - a nice, sharp, deep null,
> just about centered in the slot.
>
> Anyone have any ideas what I should be looking for?
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