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. li...@philpem.me.uk http://www.philpem.me.uk/ _______________________________________________ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there. ----- No virus found in this message. Checked by AVG - www.avg.com Version: 10.0.1432 / Virus Database: 3658/6461 - Release Date: 12/30/13 _______________________________________________ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.