[time-nuts] Some FTS1000 questions

[xaos]

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
> lester at veenstras.com
>
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> -----Original Message-----
> From: time-nuts [mailto:time-nuts-bounces at lists.febo.com] On Behalf Of xaos
> Sent: Thursday, September 10, 2020 7:44 PM
> To: time-nuts at lists.febo.com
> 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 <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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