[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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