Another FTS1000 question: what voltage do you guys measure at the "oven monitor" output? the datasheet says this pin outputs 10mV/K for the oven temperature. But my unit seems to behave a bit differently: Just after power-up, the oven monitor voltage is around 4.7 volts, and as the oven heats up, the monitor voltage drops to about 3.6 volts. To me this doesn't look like "10mV/K", as the voltage gets lower the hotter the oven is.
While this is not really relevant for the use of the FTS1000, I still would like to know what is going on here. Anyone knows something about this? BR Tobias On Fri, Sep 11, 2020 at 9:59 PM xaos <[email protected]> wrote: > Sorry OM. I just created a one off. > If I get another 4-5 people, I'll make a small batch of boards. > > George > > On 9/11/2020 10:42, Lester Veenstra via time-nuts wrote: > > Boards? > > > > Lester B Veenstra K1YCM MØYCM W8YCM 6Y6Y > > [email protected] > > > > 452 Stable Ln (HC84 RFD USPS Mail) > > Keyser WV 26726 > > > > GPS: 39.336826 N 78.982287 W (Google) > > GPS: 39.33682 N 78.9823741 W (GPSDO) > > > > > > Telephones: > > Home: +1-304-289-6057 > > US cell +1-304-790-9192 > > Jamaica cell: +1-876-456-8898 > > > > > > > > -----Original Message----- > > From: time-nuts [mailto:[email protected]] On Behalf Of > xaos > > Sent: Thursday, September 10, 2020 7:44 PM > > To: [email protected] > > Subject: Re: [time-nuts] Some FTS1000 questions > > > > As usual, Dr. Griffiths has provided all we need. > > > > Back in 2007 I had a similar issue and he worked out this very nice > circuit > > using easy to find 2N3904 BJTs. > > > > I simulated the circuit using PSPICE. Here are the details. > > > > https://www.darksmile.net/ee/frequency_doubler_BJT.html > > > > George > > > > On 9/10/2020 19:11, Bruce Griffiths wrote: > >> You could use either the NIST CG JFET doubler or its bipolar CB > > equivalent. > >> Bruce > >>> On 11 September 2020 at 08:43 Tobias Pluess <[email protected]> wrote: > >>> > >>> > >>> Dear colleagues > >>> > >>> I recently got a FTS1000 oscillator. (Not FTS1000A or B, but just > > FTS1000, > >>> I assume it is the first version). It is a very nice unit, but I wanted > > to > >>> know a bit more about its construction and opened it. > >>> After I had replaced the foam which was already quite dissolved, I > began > >>> reverse engineering the output amplifier. > >>> Has someone perhaps already done that? > >>> I was thinking about whether it would be possible to replace the output > >>> amplifier with one that has an integrated doubler (as my unit is a 5MHz > >>> version). > >>> > >>> BR > >>> Tobias > >>> _______________________________________________ > >>> time-nuts mailing list -- [email protected] > >>> To unsubscribe, go to > > http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com > >>> and follow the instructions there. > >> _______________________________________________ > >> time-nuts mailing list -- [email protected] > >> To unsubscribe, go to > > http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com > >> and follow the instructions there. > > _______________________________________________ > > time-nuts mailing list -- [email protected] > > To unsubscribe, go to > > http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com > > and follow the instructions there. > > > > > > _______________________________________________ > > time-nuts mailing list -- [email protected] > > To unsubscribe, go to > http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com > > and follow the instructions there. > > _______________________________________________ > time-nuts mailing list -- [email protected] > To unsubscribe, go to > http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com > and follow the instructions there. > _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com and follow the instructions there.
