Hi > On Mar 25, 2016, at 1:55 PM, jimlux <jim...@earthlink.net> wrote: > > On 3/25/16 5:07 AM, Bob Camp wrote: >> Hi >> >> The reverse isolation issue is indeed one of the weaknesses of this setup. >> For testing >> OCXO’s isolation is not a big deal. A normal OCOX has very good output >> buffering >> to give it the stability you are after. If you are running (maybe) a VCO >> with no buffering, that >> assumption falls apart. The VCO will / can injection lock through the >> mixer. In that >> case you *do* need an amp to provide enough isolation to prevent the >> injection lock. >> > > > But if someone were building a little module for a cheap and cheerful noise > analyzer, then the buffer amp would be a separate module.
That’s how I have always done it in the past. The need for the bufferer is rare enough that including it in the basic analyzer module is not cost effective. The HP 3048 has the same basic issue (isolation) and they made the same decision there. Bob > > _______________________________________________ > time-nuts mailing list -- time-nuts@febo.com > To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > and follow the instructions there. _______________________________________________ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
