[AMRadio] Hammarlund HQ-170 Component Layout

[Harry Petersen sr]

just about all of us has been there and done that.

On Sat, Dec 10, 2011 at 10:48 PM, Kim Elmore <cw_de_n5op at sbcglobal.net>wrote:

> Ha!  Well, I sure feel like a darned fool... It's right there, in the
> stinkin' manual as a photograph instead of a diagram. I kept skipping
> right over it, looking for a diagram. Sheesh!
>
> Well, it's good be publicly humbled by one's own hubris now and
> then... Now, back to the shop!
>
> Kim N5OP
>
> At 07:36 PM 12/10/2011, you wrote:
> >I'm finishing up the alignment on my HQ-170 (it's not the A model).
> >The manual I have is rather vague about the RF alignment procedure,
> >which essentially sets the band spread so the dial is reasonably
> >accurate across its range. It spends a lot of time on the 50-54 MHz
> >alignment. I have an HQ-170A manual that has good component layout
> >diagrams, much better than the original HQ-170 manual. However,
> >Hammarlund apparently changed the component layout a bit when they
> >went to the A, mounting some trimmer capacitors on top and changing
> >the layout on the bottom.
> >
> >For example, I've discovered one discrepancy from the HQ-170 manual
> >in that T1 and T2 in my HQ-170 are not "top slug for 455 kHz, bottom
> >slug for 3056 kHz." Instead, it's top and bottom on T1 for 455 and
> >top and bottom on T2 for 3056. I see no signs that anything was ever
> >modified in this receiver as it was my Dad's and so I know it pretty
> >well. He had marked T1 and T2 explicitly for what IF frequencies they
> >covered, so he was aware of this oddity, too..
> >
> >So, does anyone have a diagram of which trimmer capacitor is which in
> >the bottom of HQ-170? I'll also need a diagram of the antenna coil
> >layout on top. When I started on the 15 m alignment, what the HQ-170A
> >manual shows as the 15 m antenna coil doesn't act like the 15 m
> >antenna coil when I adjust it -- it appears to be for another band.
> >
> >Kim N5OP
> >
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