[time-nuts] Some FTS1000 questions

[Tobias Pluess]

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, <xaos at darksmile.net> 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 <tpluess at ieee.org> 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
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