[AMRadio] Hammarlund HQ-170 Component Layout

[Kim Elmore]

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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