Hi There have been a number of HP5370's sell for under $250 on the e place over the past year. I've bought several of them, none for more than $200. The 620 is a rare item. Like a lot of Stanford Research stuff you can get it for X any day of the week or X / 5 when a "real" seller shows up.
Bob On Nov 13, 2010, at 11:20 PM, Perry Sandeen wrote: > List, > > wrote: > I'm looking for some advice about ways I can compare the frequency > of two gpsdo's. > >> Any thoughts as to what could be obtained used for less than 1K that would >> be suited for this type of measurement ? > > OK, Here’s what I use and why. > > For a GPS receiver: the Lucent RFTG-M-XO GPS KS-24019 L106A. Google it > through Sports Lineup. $100 to $125 plus shipping all day long. Sometimes > even less. I got two over a period of time for $100 each including shipping. > > Why I use them. At the time I bought them the HP Z series were $300 to $500. > I didn’t want a Trimble from China and they require a PC type power supply. > If I had known about lady heather at the time I might have bought one. The > Lucent uses a single 24 volt power supply. Also the Trimble oscillators seem > to be of a lower quality than the Efratom in the Lucent. That said, a U.S. > supplier is offering the latest Trimble W/PS for $150. > > The downside to the Lucent is you have to use the 15 MHz output or hack it to > get the original 10 MHz before it’s up-converted. For me this hasn’t been a > problem. > > For frequency comparisons I have two HP 5370B TIC’s. It will resolve time > differences of two frequencies down to 10 pico-seconds. As a counter it > reads 16 digits plus sign. It was the last and most complex counter HP made. > I paid $450 for one and $100 for the other. (A steal). > > Downsides. They run extremely hot. One should add some additional fan(s). > Very heavy. Very large. The 10811 internal oscillator DOES NOT have EFC. > The best manual setting I could get was within 20 milli-Hz at 15 MHz. It > took a lot of time. Although both pass self-test, the 100 pico-second > differential test is off by 880 pico-seconds on one and 670 pico-seconds on > the other. This would require some serious calibration procedures. However > the error is constant so all one has to do is to remember to add or subtract > it depending how you’re measuring. For 25+ year old equipment I don’t > consider that a bad defect. > > I have 3 tested Lucent Rubidium RFG-M-RB 15 MHz/10 MHz units. One is slightly > different but they all work. I had to run them on the bench for four to > eight weeks before their offsets stabilized. I paid about $100 each with > shipping. All lucent output connectors are SMA so one needs SMA to BNC > female adapters. > > Wrote:> All are in the "sub $300" range on the normal sites. Some are sub > $100. All are available with GPIB for logging. > > I guess I’ve been looking in all the wrong places. I watch Ebay prices all > the time for HP 5370A and B prices. I’ve never seen one for less that $500. > If there are cheaper places I’d sure like to go looking! > > SR 620 This is made by Stanford Research. I agree that it is the best. It > can do Allan variations as well. A current Ebay price: Stanford Research > SR620-01 Time Interval Counter $3,250. > > It’s like the old saying: How fast can my car go? Answer: How much money > do you have? > > IHTH > > Perrier > > > > > > > _______________________________________________ > time-nuts mailing list -- [email protected] > To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > and follow the instructions there. _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
