Bob, if you want to let one of those 5370s go, contact me directly: [email protected]
On Sun, Nov 14, 2010 at 8:39 AM, Bob Camp <[email protected]> wrote: > 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. > _______________________________________________ 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.
