Giuseppe Marullo wrote:
Robert,
Welcome to the group.
Thank you and all the others, you are giving me a lot of informations.
BTW, my provider retrieved my emails so I am fully operational (at
least I hope).
while I did not originally envision building this kind of equipment, I
could do it while it lies well within the digital domain, I have some
test gear (frequency counter, DMM, analog scope, BF frequency
generator, LA and some FPGAs with 100+Msamples ADC) but...I will have
to trust it so I am back at square one, until I have a reliable
source... I would like a GPSDO, possibly ready to run, then I will
start building something that I could actually check against the GPSDO.
Maybe a GPSDO myself, who knows...wondering if this could be done all
digital, without using a DAC, without using a driving voltage for a OCXO.
Giuseppe
Giuseppe
One can use a DDS or equivalent phase continuous high resolution
sysnthesizer to produce a corrected output frequency using the OCXO
frequency as an input, however the DDS itself uses a DAC and you will
probably need to use a few cascaded mix and divide stages to reduce the
spur amplitude to an acceptable level.
This has the advantage that one can use an OCXO that either doesnt have
an EFC input or one that has drifted beyond the adjustment range (via
EFC and/or mechanical trimmer) but is otherwise quiet and stable.
Bruce
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