Double balanced mixers work best with square wave drive, so that's really not
an issue.. Even if you drive it with a sine wave, the mixer will clamp the
drive voltage swing, resulting in drive currents that look more like a square
wave. However, if your chosen DDS can work over the required frequench range,
it should be OK. You'll probably need some gain after the DDS though.
Sent from my Verizon Wireless 4G LTE Tablet
-------- Original message --------
From: Computer Burgas <secvritas1@xxxxxxxxx>
Date: 07/25/2016 4:19 AM (GMT-05:00)
To: minima@xxxxxxxxxxxxx
Subject: [minima] for minima project
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.
