[Hammarlund] HQ-150 Question

[Richard Knoppow]

    Just to remind me, this noise happens when you tune the receiver. If 
so does it happen only with the main tuning or only band spread, or 
both? Does it happen when the tuning controls are not changed? I am sure 
the answers are in the thread but I am too lazy to look.
    One way to check which sections of the cap are used on this band is 
to touch them, it should kill the oscillator or at least shift the 
frequency a lot. I have trouble reading the schematic off the computer 
and want to know if only one section of the capacitor is being used. 
Plus, is it used on any other band, alone or in combination. If it is 
used on any other band then the tuning cap or BS cap can not be at 
fault. Whatever this is has to be exclusive to the highest band. If it 
turns out NOT to be the cap but it happens when you tune then it has to 
be something that is mechanically connected, i.e., moves in some way 
when the tuning knobs are turned. Perhaps poking around with a chop 
stick or similar will help to find it. It may be something like an 
unsoldered or cold-soldered connection, perhaps on the band switch.


On 7/31/2024 1:10 PM, Dan Martin wrote:
> Yes, trying this would be big-boy radio, indeed! Probably not my next choice but I appreciate the suggestion and will file it away.


-- 
Richard Knoppow
Los Angeles
WB6KBL
SKCC 19998