[time-nuts] Efratom SLCR-101 rubidium - what have I just bought?
quartz55
quartz55 at hughes.net
Tue Dec 31 12:14:10 EST 2013
Just for reference, my LPRO-101 is dirty as dickens. I get solid harmonics out to 150MHz. I haven't looked at it on a scope yet. There's a good filter on line, I think it was made for the LPRO, if you want the link, I'll look it up.
Dave
----- Original Message -----
From: Philip Pemberton
To: Discussion of precise time and frequency measurement
Sent: Tuesday, December 31, 2013 12:04 PM
Subject: Re: [time-nuts] Efratom SLCR-101 rubidium - what have I just bought?
On 26/12/13 21:01, Charles Steinmetz wrote:
> Several observations:
>
> The listing is titled and the item is described in the listing text as
> an "EFRATOM LPRO-101 10Mhz Oscillator," but the item in the photos is an
> SLCR-101.
The frequency standard arrived today. It is indeed an SLCR-101.
Lamp voltage measured at 8.14V on my Agilent DMM; if I cared enough I
could connect it to one of the recently-calibrated Solartrons but that's
a good enough ballpark figure for me
Lock is achieved (BITE goes low) after a few minutes, less if the Rb is
already warm. My TCXO-referenced Racal 1991 reports a frequency of
9.99999921 MHz after both have warmed up for a few minutes. With BITE
high (no lock), the frequency varies up and down by almost 100Hz each
way, then snaps back to the above figure when the Rb locks.
I might hook it up to the spectrum analyser later and see how clean the
output is, but on the scope it looks pretty clean.
> While the seller appears to be in the UK, the "used" stickers are the
> same (including handwriting) as those applied by an infamous Chinese
> supplier, who sells from a number of China-based ebay accounts. So the
> ultimate origin of the item on the surplus market is apparently that
> Chinese seller.
"Infamous Chinese supplier" - who?
My suspicion is that this unit was bought, used for a brief while
(perhaps to calibrate a few instruments) and then left on a shelf.
Thanks,
--
Phil.
lists at philpem.me.uk
http://www.philpem.me.uk/
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