[Hammarlund] Merry Christmas and HQ-180A alignment

[Richard Knoppow]

    FWIW, TMC always talked about stability in their advertisements for 
the GPR-90. Actually, its a very stable receiver. I found in their 
instructions somewhere that by "warmed up completely" they meant 48 
hours. Even my old BC-779 was dead stable after that long.
    To often instructions say something like "at least half an hour", 
never enough.

On 12/24/2023 10:23 AM, Bob Young wrote:
> 
> 
> Les Locklear suggested leaving the radio and URM-25 on all night and it did the trick. I think that during my marathon alignment sessions before it was still warming up and wasn't reaching steady state for hours. After leaving them on for twenty fours hours I completely aligned it yesterday and went over the RF twice, no more selectivity deviation and all the bands are right on, it still doesn't exactly sound like a McIntosh but that's expected. I aligned 60KHz first, 455 second and 3035 third, per the Feb 1970 manual. I believe you tune the 3035 crystal oscillator section to exactly 3035 during the 3035 section from the Feb 1970 manual, the only thing they left out was putting the radio in the BCB band during the 455 alignment.
> 
> 5. To align the 3035 kHz IF, leave the voltmeter connected as in step 3 and set the signal generator to 3035 kHz. Adjust the output of the generator as necessary to maintain approximately -5 volts on the VTVM. Adjust the bottom slug of TI and the slug in T2 for maximum meter reading.
> 
> This completes the IF alignment procedure. For RF alignment, continue with step 6 below.
> 
> Bob
> KB1OKL


-- 
Richard Knoppow
Los Angeles
WB6KBL
SKCC 19998