[Heathkit] SB-101 Driver Preselector problem and an answer

[Kenneth G. Gordon]

 My SB-101 Peaks differently on Recieve and Transmit - If I peak my reciever at
> 7.2 mhz and the preselector is about the 12 O'clock position, my transmit peaks
> at around the 1 to 2 O'clock position - This occurs on all bands - I'm sure
> there is a simple fix for this - Any help would be appreciated

See answer # 1 for details.

There is another problem with the alignment of the Heathkit transceivers, 
HW-100/101, and SB-100/101/102, which needs to be addressed:

Since the receiver RF amp plate coils, and the Mixer plate coils, from 40 
meters on up are in SERIES, and that stack of coils is then in parallel with 
the 80 meter coil, the normal alignment procedure is to 1) peak 80, 2) peak 
10, then 15, then 20, and lastly 40 meters. If you try to align these in any 
other order, the rig will not work properly.

Further, although you will have plenty of adjustment on the 
Driver/Preselector control on 80, 20, 15, and 10 meters, you will have 
BARELY enough range on that control to cover the entire 40 meter band.

What I used to do, is to set both the Driver/Preselector control and the VFO 
in the exact center of their ranges when aligning 40 meters, then swing both 
to either end to see if it peaked up on both ends, and tweaked the coils if 
necessary. I also ordinarily peaked the coils in the transmit mode, not 
receive.

Lastly, the SB/HW transceivers will easily cover 500 Khz both above and 
below 80, 20, and 15 meters, without realignment, whereas 40 will just barely 
cover the 40 meter band. I never tried this on 10, but I see no reason why it 
shouldn't work.

If you choose the proper frequency of heterodyne oscillator crystals, and use 
an EXTERNAL crystal oscillator to plug those crystal in to, you can easily 
use the SB/HW rigs for MARS.

I used my SB-101.5 for AFMARS on frequencies above the 20 meter band 
for a number of years to do phone patching into SEA, and yet it took a matter 
of a very few minutes to re set it for the 20 meter ham band by simply 
exchanging crystals, and moving one wire. Sort of a poor man's KWM-2A, 
with a VERY MUCH better receiver than the KWM-2A, BTW.

Ken W7EKB