DDS VFO hooked up to 9volt supply (supposed to be 12 volts) IF offset set to 0Hz, VFO spun up to 30Mhz, scope displays 30Mhz ok at max timebase (.2usec) and on X10 magnify, 'scuse poor pics, had to turn off one of the lounge lights as it was masking the camera with glare, also had to reduce the brightness in file to get below the max forum upload size plus I'm a crap photographer.
All appears to be well but bear in mind what's shown is without any proper termination on the VFO output just the scope probe set to X10, the displayed output increases somewhat at lower frequencies, according to the specs it's supposed to, part of that is probably due to the scopes rated bandwidth or the probes, I don't think the probes are the best.
It will be used for supplying a mixer for either a Regenerodyne or a Direct Conversion receiver.
The VFO's step rate can be quickly altered from 10 Mhz steps down to 1 Hz steps.
It's output frequency will go higher but at the moment I've set the max frequency to 35Mhz and the min frequency to 500Khz, the 'scope and the VFO seemed to have past the test:
Lawrence.
All appears to be well but bear in mind what's shown is without any proper termination on the VFO output just the scope probe set to X10, the displayed output increases somewhat at lower frequencies, according to the specs it's supposed to, part of that is probably due to the scopes rated bandwidth or the probes, I don't think the probes are the best.
It will be used for supplying a mixer for either a Regenerodyne or a Direct Conversion receiver.
The VFO's step rate can be quickly altered from 10 Mhz steps down to 1 Hz steps.
It's output frequency will go higher but at the moment I've set the max frequency to 35Mhz and the min frequency to 500Khz, the 'scope and the VFO seemed to have past the test:
Lawrence.
