[Hammarlund] alignment HQ-170

Mon, 3 Mar 2003 02:57:21 -0500

My HQ-170 had a failure inside T1 as that winding has the B+ voltage on it.
The unmarked mica cap in the base of T1 shorted and melted some of the white
plastic, and burned out R9, 1K resistor.  I first found the burned R9 and
replaced it and it burned out again, then found the shorted cap inside of
T1.  I got a replacement transformer, and measured the cap inside of T1, but
I have not found my notes yet.  I did post my results with the cap value to
the list around july 1-3 2000 if you can find an old message, or maybe
someone has the message.

Mike Tallent W6MXV

There is very little voltage on the T2 transformer, but I guess it could
still fail.
----- Original Message -----
From: "Patrick A. Thompson Sr." <[email protected]>
To: "Kenneth G. Gordon" <[email protected]>; "Patrick A. Thompson Sr."
<[email protected]>; <[email protected]>
Sent: Sunday, March 02, 2003 3:54 PM
Subject: RE: [Hammarlund] alignment HQ-170

> 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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>
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