In old minima project, after series of tests I found that Si570 has too
many harmonics and frequency counter reported me them rather than the
fundamental frequency, which means that the mixer and quartz filter
probably being down work properly. Also the cost of Si570 in ebay is 2-3
times higher than , for example - AD9851. Moreover BFO also realized
unstable frequency. I decided to work towards replacing VFO and BFO with
the 2 pcs of AD9851 DDS generators. So with this I will get freq accuracy
and easy programmability of LSB and USB in BFO and VFO.
