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
You could use either the NIST CG JFET doubler or its bipolar CB equivalent.
Bruce
> On 11 September 2020 at 08:43 Tobias Pluess 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
Hi
A couple things to check:
1) Is your power supply doing odd things? It’s the first thing I’d suspect in
this case.
2) Does the OCXO “behave” if you turn off the GPS ( = disconnect the antenna )
and watch
it with a counter?
3) While the antenna is disconnected from the TBolt, hook it to
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
Newbie here looking for comments from people with more experience with
thunderbolt E's to comment on what I am seeing.
Unit is jumping and ramping the DAC one direction then goes stable for a
bit only to start jumping and ramping the other way.
Oscillator heading south or more likely the
On Donnerstag, 10. September 2020 16:14:45 CEST Jim Harman wrote:
> I recently purchased an LPRO rubidium from the auction site. The mounting
> surface is covered with a thin soft, dry light blue material with a sheet
> of brownish plastic film underneath. I assume this is the remains of an
>
Hello Jim.
Personally I would delicately remove the remains of the thermal plastic
film from surface and clean it with a cloth lightly moistened with 70 or
90% alcohol.
Then a thin film of thermal grease or a new thermal film to reduce
thermal gradient and all will be OK.
Regards,
Claude
That's what I did with my LPRO, and it seems to be happy- I've been using
it for a
couple of years now with no apparent difficulty.
Dana
On Thu, Sep 10, 2020 at 9:29 AM Jim Harman wrote:
> I recently purchased an LPRO rubidium from the auction site. The mounting
> surface is covered with a
Hi
Unless the pad is damaged, it makes a fine “gap filler” to attach the device
to a heatsink. You don’t get thermal compound all over everything when using
the pads ….
Given the (large) surface area and the amount of heat involved, the relative
performance of silver loaded (gray) thermal
I recently purchased an LPRO rubidium from the auction site. The mounting
surface is covered with a thin soft, dry light blue material with a sheet
of brownish plastic film underneath. I assume this is the remains of an
adhesive thermal pad.
Should I peel this off and expose the bare metal
Hi
Maybe a good idea to “back up” a bit here:
The most commonly plotted data for the performance of a GPSDO is ADEV.
Very simply put, to do ADEV you take a series of readings at a specific time
spacing ( called tau ). The delta frequency from one reading to the next is then
computed. You take
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