Interesting, mine does not have a HP tag, just a dot-matrix printed label with one line. Hopefully by next spring I'll be set up to where I can do some 'real' checking of the the oscillators I have.
Thank you for the enlightenment -pete On Wed, Aug 5, 2015 at 8:13 AM, Charles Steinmetz <csteinm...@yandex.com> wrote: > Pete wrote: > > When I got it, my luck won this time, one of the coax >> cables is tagged 10 MHz and the other EFC. >> > > That, by itself, does not differentiate between an HP 10811 and the > Symmetricom OCXO -- they are identical 10MHz oscillators externally (the > doubler in the Symmetricom is internal). In my experience, the only > conclusive external feature is the presence or absence of the Hewlett > Packard ID on the serial number sticker. 10811s have a serial number > sticker with Hewlett Packard ID (see photo below). If the serial number > sticker doesn't have the HP ID, it is the Symmetricom oscillator. > > As I noted, having the Symmetricom oscillator is not necessarily a bad > thing -- mine is better than all of my 10811s, including the selected 10811 > that came out of an HP5390A frequency stability analyzer. (This should NOT > be read as a claim that the Symmetricom oscillators are better than 10811s > -- my sample of the Symmetricoms is way too small to justify any conclusion > in this regard. But this particular Symmetricom happens to be a very fine > "10811 class" OCXO.) > > Best regards, > > Charles > > _______________________________________________ > 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.