[Hammarlund] HQ-129X and LSB again

[Kim Herron]

Hi john,

>3) The signal is MUCH stronger if I approach the transmission from the low
>side.  of course, I can't clarify it at all with the BFO, just change the
>pitch of the quacking.
>
>It just seems to me that my filters aren't lined up with my tuned
>frequency 100%, and that's why USB (where I'd have more luck on the lower
>side of the frequency, right?) works better than LSB.  Any further
>thoughts are appreciated.

      I can't hear what it is doing, but I'd bet that you 455 crystal in 
the filter is off freq.  You've aligned
the radio to a different freq than that crystal is (1/2 to 1 khz) and 
that's where your trouble is.
What you usually need to do here is to put the sig gen through the filter 
itself and tune the generator for the
loudest signal.  When you find that, you've also found the freq that you'll 
need to align the rest of the IF strip to.
That will center the filter in the IF and then you get BOTH side band and 
not just one.  Don't forget, too,
that when you go from USB to LSB, you have to change the BFO freq to the 
other side as well so you're
getting the right mixing product for detection.


Thanks!!

Kim Herron  W8ZV
1-616-677-3706