[Hammarlund] mike mcoy shields/list

[Mike Taylor]

Hey Mike...My Hq180 developed a minor problem a couple of years ago. On =
the two upper bands, in the middle of the dial range, slightly adjusting =
the main tuning will cause the oscillator to jump up or down a few =
hundred hertz. At first I thought it might be a failing tube, but I =
wasn't able to solve the trouble. So I removed the cover from the main =
tuning assembly. I'm not sure, but I think a portion of the drive gear =
has some play due to worn teeth on the gear. In seeing how this assembly =
is put together, I decided that replacing the gear wasn't worth the =
trouble. The bandspread compensates fine. Anyway, I never replaced the =
shield and noticed no change in performance. I think the shield's main =
benefit is to keep dust and dirt out of the assembly. I have no plans to =
remove the shield from the bandspread unit. By the way, has anyone ever =
seen this minor main tuning "jump"? Still a mystery to me but but not on =
my immediate "things to deal with" list. Mike, as for discussing =
Hq180's, yes this is the place for it. I've learned more about =
Hammarlund on this site in the last several months than from anywhere =
else in the last 30 years. Duane Fischer, our excellent administrator =
and who runs the HCI net twice a week, is a Hallicrafters fan. He's =
never yelled at me for asking here where I can go to find Hallicrafters =
info (At least not yet). As for other products, check out the =
Transocianic Fanatic at Yahoo Groups. Heathkit has a great billboard, as =
does the Knight-kit page. 73's Mike Taylor


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