Thanks to Bruce and George. The NIST doubler is indeed what I planned to use, or a Minicircuits AK-2.
What voltage do you guys measure on the oven monitor output? I am not sure whether this is really 10mV/K. Mine outputs some 4 volts, that would mean oven is >100°C which I don't believe. BR Tobias On Fri., 11 Sep. 2020, 02:52 xaos, <[email protected]> wrote: > 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.
