Lee;
A DDS VFO does have some issues when used to directly drive a transmitter.
The biggest one is spurious outputs. These may be only 70 dB down from the
carrier and a few kHz to 100's of kHz away. Now when you are running low
power, such as the KX1, this doesn't matter too much. But if you directly
run a kW from a DDS VFO, you may make some other folks not too happy with
your spurious outputs.
-John
KI6WX
I've been researching the DDS VFO topic on the Internet and found that
somethings have been done in this area in the USA, but most of the sites
are found in Japan or Europe. Why has the DDS-VFO type of circuit caught
on here? I am looking for a kit or a project I could build for some Xtal
control rigs I have rather than buy Xtals. Seems to me that would a nice
way to go. I know that Flex Radio has done quite a bit of work with DDS
and so has Elecraft. I wonder if there is a market out there for DDS VFO
technology and a crystal replacement....
Lee - K0WA
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