[Hammarlund] alignment HQ-170

Sun, 02 Mar 2003 15:54:40 -0500

I'm not certain but I believe the problem is inside T2 which is a combo 455
and 3035 IF transformer.

When I run the slug up against the top of the metal can the signal levels
jump up. This is (I hope) because the mica sandwich at the base of the can
is under more compression.

I have the can apart now on the bench.  The windings are intact and I am now
trying to calculate the value of a replacement external capacitor to replace
the mica compresssion caps sandwiched in the base of the assembly. I've
removed the mica sheets so there is no turning back now.

A grid dip meter or my MFJ-259 used as a grid dip meter come to mind for
determining the value of the external cap needed. Of course if someone
already knows this value???

Please wish me a steady hand!

There's more to do.

Pat
wa4tuk

> -----Original Message-----
> From: [email protected]
> [mailto:[email protected]]On Behalf Of Kenneth G. Gordon
> Sent: Sunday, March 02, 2003 3:54 AM
> To: Patrick A. Thompson Sr.; [email protected]
> Subject: RE: [Hammarlund] alignment HQ-170
>
>
> > You are correct. I should have noticed that; however, I still
> can't get good
> > overall gain. I tried signals on 160 meters and still have a
> deaf receiver.
>
> A couple of years ago I was given an HQ-110-C which was in pretty
> bad shape. I essentially restored it electronically. One thing I
> discovered which surprised me was that if I didn't have the antenna
> connections, or jumpers, correct, gain on 160 and 80 were WAY
> WAY down.  When I fixed that (an easy fix), gain on 160 and 80
> were back up there with all the other bands: about 1 microvolt or
> less.
>
> Ken W7EKB
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