I found a 83 cent crystal at Mouser that will put the SR40 on 60
meters. (Digi-Key also has this frequency xtal). It's a 21.4772 mHz
xtal, resulting in an oscillator frequency of 5.3693 mHz. The Mouser
part number is 695-HC49US-214.
This is not the ideal oscillator frequency for this application, but
it does give you three of the five 60m channels; 2, 3, & 4.
Unfortunately channel 3 has the oscillator sitting in the middle of
it, so it's not very useable. However channels 2 and 4 work, and
channel 4 is probably the most active 60M channel.
A 21.562 xtal would be a better (but more expensive) choice; resulting
in an oscillator frequency of 5.3905, which would reside in the 29 kHz
gap between channel 4 and channel 5. This crystal would give you
channels 3, 4, and 5 (channels 4 and 5 are probably the most active).
The SR40 on 60M (or is it a SR60 once converted?) works great. No need
to change the band pass filter either.
Bob WA6UFQ
