On 7/12/2011 at 9:04 PM Bill Dailey wrote:
Ok, I have a dds receiver locked to a gpsdo, the radio can only be tuned
in 1 hz increments but should be dead on. I can feed the passband into
speclab via VAC and measure a carrier OTA. No problem there...can get
decent resolution but there is some uncertainty with regard to the dds
(frequent dependent). What I would like do is inject a known frequency to
either zero-beat the carrier (assuming I can get something with millihertz
resolution) or provide a non-superimposed carrier that I can reference via
difference in speclab. The whole point is to eliminate or measure the dds
offset at a particular frequency.
Is this a one time measurement (i.e. you've got a DDS, and you're not
sure it's being programmed correctly, and want to verify that it works)
Why not something like an accurately known XO with a comb generator (aka
a "marker generator") You've got a GPSDO, so presumably you have a 10
MHz that's good to milliHertz (1 part in 1E10). Generate a comb at
10,20,30,40,50.. MHz all the way up
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