Boy you are spot on about what "damage" sales guys can do. The original OCXO spec is x10 better than the 16Hz I get with the DAC at the limit.
Thanks. -Brian, WA1ZMS/4 iPhone > On May 26, 2014, at 6:25 PM, Bob Camp <[email protected]> wrote: > > Hi > > >> On May 26, 2014, at 5:54 PM, Brian, WA1ZMS <[email protected]> wrote: >> >> My high-spec ULN Wenzels have trimmers. >> > > I doubt that HP has put a trimmer OCOX into a new design since the 10811 was > new. The Wentzel ULN’s are *not* high volume parts. > >> This this thing is 16Hz high at 10MHz so it's way off. > > 16 Hz is 1.6 ppm. That’s not really all that far. If the oven failed it would > be much farther off > >> Must be sudden failure. If I use an external ref the test set is fine. OK >> for lab use. But a pain when out working in the field on ham repeaters. It >> may be an OEM number. At work we noticed quite a change in PTI product >> lines after MTron bought them. > > Renumbering all the products is what keeps the marketing guys employed… > >> >> -Brian, WA1ZMS/4 >> iPhone >> >>> On May 26, 2014, at 5:15 PM, Bob Camp <[email protected]> wrote: >>> >>> Hi >>> >>>> On May 26, 2014, at 4:31 PM, Brian, WA1ZMS <[email protected]> wrote: >>>> >>>> I am trying to repair my HP-8920 RF Com test set since its internal >>>> >>>> 10MHz OCXO has aged way beyond the DAC EFC cal range. >>> >>> How far out is it? >>> >>>> (There >>>> >>>> is no trimmer cap to allow adjustment.) >>> >>> Trimmer caps went out a long time ago on OCXO's >>>> >>>> >>>> >>>> The OCXO is 10MHz and is marked PTI XO1145. >>> >>> It’s probably an OEM part number >>>> >>>> PTI no longer lists nor seems to sell this OCXO. >>> >>> They likely only sold that part to HP >>> >>>> >>>> >>>> >>>> Has anyone seen or have a replacement OCXO or already been >>>> >>>> done this path before? I hate to re-invent the wheel. >>>> >>>> I can buy a used A15 ref module but I still may end up with one >>>> >>>> that has an OCXO that's out of cal range. >>>> >>>> >>>> >>>> Reply off-list is fine. > > which takes all the fun out of it > >>>> >>>> >>>> >>>> -Brian, WA1ZMS >>>> >>>> >>>> >>>> _______________________________________________ >>>> 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. >>> >>> Bob >>> >>> >>> _______________________________________________ >>> 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. > > Bob > > _______________________________________________ > 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.
