3.5999MHz:
Here are simple ones, I have not seen before:
- 3.6 = 14.000 - 10.400 = 14.000 - 2 * 5.200
- 3.6 = 14.400 / 4 = (2 * 5.200 + 4) / 4
- 3.6 = 7.200 / 2 = (5.200 + 2)/2
Three band MEPT:
#1 of the above combinations has added value, since the 14.000 oscillator could be modulated, providing a 20m MEPT at the same time. At the same time, cf. an earlier post, 14.000 can be down converted to 7.0599MHz by means of a 15m QRP crystal.
Summarizing:
- 80m: 3.5999 = 14.000 - (2 * 5.200)
- 40m: 7.0599 = 21.060 - 14.000
- 20m: 14.000
As for the QRP crystal, know your sources: Box73, ESS, QRP clubs, etc.