[time-nuts] HG 414A Rubidium
pete at petelancashire.com
Thu Mar 24 23:47:48 UTC 2011
On Mar 24, 2011 4:31 PM, "Magnus Danielson" <magnus at rubidium.dyndns.org>
> Fellow time-nuts,
> Today a new box entered the lab, a Götting KG HG 414A. This is not of
> German origin, but is in fact a Soviet/Russian TSCH1-78. I've got SN 052
> made in 1992, but the manual seems to be written in 1986.
> Manuals is some form of copy method I just can't recall right now, but
> stencil looks possible.
> Mine comes with complete electrical and mechanical drawings, calibration
> manual with nice stamps . All that in russian. There is also some
> manuals translated into german which helps me a lot in the basic get
> started operation, even if my german is close to non-existent.
> It is in good shape, even if a quick look at the waveforms shows that
> some improvement can be achieved. It locks and operates relatively well
> straight out of the box.
> So, what does it do?
> It has a Rubidium reference in it. A 5 MHz OCXO which synthesize into 90
> MHz and 5,31746 MHz which then is mixed in the cavity to 6,83468254 GHz
> with a 86,8 Hz phase-modulation for resonance sweep.
> It has a lock-indicator on the front and also a trimmer for OCXO
> adjustment with indicators of direction to turn.
> With that in hand, it generates 10 MHz, 5 MHz, 1 MHz and 100 kHz sine
> It further takes a 5 MHz input and measures it's frequency over one
> second with 1E-11 resolution or over 10 or 100 s with 1E-12 resolution.
> It shows 7 digit numbers. It essentially mix down to 500 Hz, 50 Hz or 5
> Hz and measures. Works nicely.
> It can also measure time-differences, and thus relates to the time it
> has. It is fairly easy to set up the time of day in HH MM SS and it
> looks like you can take a PPS and time-align it to it. Then you can
> measure that time-difference. It also has a delayed output which is
> programmable in 100 ns steps.
> So, this box is a bit of everything, but a rather nice one.
> The DC connector is unknown to me, but the AC is a standard IEC one, so
> that took no time to hook up.
> It will take some time to fully understand it, but who said it would be
> I need to brush up my russian and german... ah well.
> I use a TADD-2 for wave-cleanup, but it only achieves it partly.
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