[AMRadio] Hammarlund HQ-170 Component Layout

[Kim Elmore]

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