Sure. Simple actually. On the hetrodyne oscillator board you will find
several crystals. The lowest freq is the 75/80 meter band.

You can simply replace that with another crystal 500khz HIGHER in frequency
and now operate from 4.0 to 4.5mhz. Or install a switch or relay circuit to
switch in the 'additional' crystal.

A slight amount of adjustment will probably be needed to broaden the tx
output so that is is even across the new spread. Or maybe it will do fine
as is.

I have done this mod on a SB-102 and it will work fine.

Dan/W4NTI

"Rick Disney" wrote in message
...
Has anyone used a Heathkit HW-101 for Mars? It's 80 Meter preset is 3.5
and
the center tuner
only adds 500 hz to 4.00...Navy mars operates at 4470.5. Any help!!!

73's
Rick KAØDIZ