David, The FE-5680A is always plentiful, and a lot of them are generally mounted on a PC board, from pulls, along with having a decent price. The main thing is availability, which means spare parts if you need them. I also know that I've seen these used as internal timebases for counters before on the larger HP types.
The LPRO-101 is almost as plentiful, and where it's in a flat package, similar to the FE-5680A, it can be internally mounted in the larger counters. The SLCR-101 doesn't seem to be as plentiful, but some of these are supposed to have a new type lamp, with longer life. They generally cost a bit more too. The FRS-C, if I recall, are older units, and are boxy, which makes them harder to mount in thin chassis, if you want to add them inside a counter, etc. However, they are generally cheaper, and if you're using a home brew cabinet, size doesn't really matter then. I have only used the FE-5680A, myself, and can recommend it, but have read quite a bit about the others in the past. I also think that long-life lamps are available for most of the newer units too. Best, Will *********** REPLY SEPARATOR *********** On 7/11/2011 at 12:37 AM Dr. David Kirkby wrote: >I'm looking to get a rubidium source to use as a reference for a spectrum >analyser, frequency counter or similar test equipment. All these need a 10 MHz >input. > >I've looked on eBay and found a few that seem to be in plentiful supply > >* EFRATOM 10MHZ LPRO-101 >* FE-5680A >* SLCR-101 >* Efratom 10MHZ Rubidium FREQUENCY Standard FRS-C > >Is there any reason to chose one over another for the application I have? > >Is there any seller to avoid or you can suggest is particularly good? I want to >import this to the UK, but are not bothered where it comes from, as long as the >seller is reliable. > >Dave > >-- >A: Because it messes up the order in which people normally read text. >Q: Why is top-posting such a bad thing? >A: Top-posting. >Q: What is the most annoying thing in e-mail? > >_______________________________________________ >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. > >__________ Information from ESET Smart Security, version of virus signature database 5851 (20110206) __________ > >The message was checked by ESET Smart Security. > >http://www.eset.com _______________________________________________ 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.