Hi By any chance is the connector a BNC? They have been known to create similar looking issues.
Bob On Mar 3, 2013, at 9:59 AM, John Ackermann <[email protected]> wrote: > I was measuring two OCXO and was getting some quite unusual results -- a > symmetrical frequency cycling of several more than 1e11 p-p, with a period of > around 15 seconds. > > I removed an RG-58 3 foot jumper cable that fed 5 MHz from the rear panel of > another OCXO to a patch panel (where it was terminated in 50 ohms), and the > noise quieted right down. See the attached frequency plot. > > The other OXCO had a similar jumper cable in the path, and although the two > cables were not parallel to each other for any significant distance, there > was still enough signal radiation and pickup to cause a nasty problem. > > Lesson learned -- use only double-shielded cable in the oscillator rack (and > in any RF measurement path) from now on. > > John > <austron-fts-beat-note.png>_______________________________________________ > time-nuts mailing list -- [email protected] > To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > and follow the instructions there. _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
