[time-nuts] Some FTS1000 questions

[xaos]

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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