Re: Timepod (was - Morion OCXO)


Grant Hodgson <grant@...>
 

The Timepod is a very high performance instrument for measuring the stability of signa lsources. It uses cross-correlation to reduce the system noise floor to very low levels. It was designed by John Miles KE5FX as a commercial product which is sold by Symmetricom.

Timelab is the analysis program that does the back-end processing, also written by John and performs time, phase amd frequency analysis.

The Timepod uses LTC2216 ADCs and great care was taken with the signal layout, use of low-noise regulators, signal conditioning etc. Digital data is sent to the PC for processing in Timelab, which does the FFTs, user displays etc.

Timepod retails for around $5k, out of the reach of most amateurs but representing and exceptional price/performace for commercial customers. The schematic is provided in the manual if you want to roll your own!

regards
Grant G8UBN

Quoting "Andy Talbot andy.g4jnt@... [ukmicrowaves]" <ukmicrowaves@...>:

Interesting link - in a way. That 'TimePod', described as a 'Programmable
Cross Spectrum Analyser' [whatever that is ] needed to provide input to
the measurement software is an enigma. They state it uses "... high
performance host-based DSP techniques ... " which really means everything
that matters is done on the PC and the Pod could be something quite simple.

My guess is, its a digitiser as in any direct sampling SDR (and judging by
the upper frequency limit of 30MHz, an average-range one).

'jnt


On 3 August 2016 at 08:54, Stephen Tompsett stephen@...
[ukmicrowaves] <ukmicrowaves@...> wrote:



For comparing oscillators you might find Timelab useful

http://www.ke5fx.com/timelab/readme.htm

On 02/08/2016 19:29, Edward Harland g3vpf@... [ukmicrowaves]
wrote:


My MV89 came still attached to the PCB. Someone had gone round the edges
with tinsnips. No attempt had been made to de-solder the unit. It has full
output and works at all orientations.

I tried comparing the frequency of the MV89 with the Leo Bodnar GPS and
found that for about an hour after both units were switched on the relative
frequency was changing pretty much continuously but then slowed and
stopped. After adjusting the frequency trimmer on the MV89 it held the
frequency for the next 30 minutes. Had to stop the test at that point. I
have no means of finding out which, or both, of the units were changing,
but the result looks very promising.

Will now build a unit with built-in batteries so the MV89 is always on,
even when travelling to a /P location.

Thanks for all the comments received - very helpful.

Ed G3VPF

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