Dear forum,
I have a DDS ( PA2OHH's ) and want to try this as an LO of my BITX.
for reason I don't need to add a frequency counter,
and he PA2OHH is succeed used DDS as 5 to 5.5 MHz VFO
(for an old TS520,stability is good enough now for PSK31)
for schematic of DDS please see :
But I don't know where to connect this DDS to my BITX point,
How about before coupling capacitor 0.1 of Q7 ? please advice.
I have measured my DDS output and the specification is :
4.1 ~ 5.6 MHz = 22 mW
5.5 ~ 7.8 MHz = 16 mW
7.4 ~ 10.7 MHz = 14 mW
10.6 ~ 15.2 MHz = 12 mW
14.5 ~ 20.3 MHz = 34 mW
20 ~ 29 MHz = 6 mW
Thanks.
