[time-nuts] Quartzlock E10-MRX
I have a Quartzlock 3 that was an OCXO based 10Mhz standard. It has a really nice distribution amp so I replaced the OCXO with an LPRO-101 and added a fan. The switching power supply is external. I’m sure some will cringe with the thought of a fan in the enclosure but it works really well and is quiet. I added a fine adjustment and a test BNC 10Mhz jack to the front panel. https://oi906.photobucket.com/albums/ac262/rjb1998/Inside_zpskowa2fvj.jpg https://img.photobucket.com/albums/ac262/rjb1998/Front_zpsiwxnlizx.jpg -Arthur ___ time-nuts mailing list -- time-nuts@lists.febo.com To unsubscribe, go to http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com and follow the instructions there.
Re: [time-nuts] GPS antenna splitter recommendation?
Most of the regular splitters first mentioned are basically transformers with one side if each winding connected to the case ground so they don’t work because they short out the 5 VDC on the receiver’s antenna coax. You have to be aware of the D.C. voltage to power the antenna plus have fake antenna load resistors on the other ports to prevent error messages. The cheapest non-powered splitter is probably the F connector Steren 4-way 2.4Ghz splitter made for TV use at $6-$9 each (like eBay # 254474121010). Their model 201-234 passes 1 port and couples the other 3 ports with capacitors. I found I could just pry the back cover off the splitter and solder a 200-330 ohm resistor across each isolated outputs to prevent the receivers on those ports from giving an open antenna alarm. Those receivers would still work without the resistors but I couldn’t stand the error message so I installed the load resistors. Mini-Circuits has made dedicated GPS splitters that have built-in amps to compensate for losses and the ones I have work quite well. The 5 port one has a Lucent part number and was made for Telco use with 2 power ports and 3 isolated ports to which I added 280 ohm resistors. You will find these on eBay occasionally for far less than the HP versions. One of my GPS antennas goes to a WR Incorporated 8-way externally powered splitter with load resistors built in. So there are a number of options for GPS splitters but they may not be that common. However, just today I bought another of the 5 port Mini-Circuits ones on eBay so they do turn up. https://oi906.photobucket.com/albums/ac262/rjb1998/GPS%20splitters%202_zpspobtp7cf.jpg https://oi906.photobucket.com/albums/ac262/rjb1998/GPS%20splitters_zpsbitr26xx.jpg ___ time-nuts mailing list -- time-nuts@lists.febo.com To unsubscribe, go to http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com and follow the instructions there.
[time-nuts] Trimble Tbolt temperature
-55 degrees seems to be a common temperature displayed by a defective DS1620 temperature chip. https://datasheets.maximintegrated.com/en/ds/DS1620.pdf -Arthur ___ time-nuts mailing list -- time-nuts@lists.febo.com To unsubscribe, go to http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com and follow the instructions there.
[time-nuts] Trimble Tbolt temperature
If you choose to replace the DS1620 keep in mind that there are different revisions of the chip and the 'E' revision displays the temperature in larger steps than the previous revisions but the 'D' version is still pretty common and it probably doesn't make any difference other than how the Lady Heather graph will look. I'm not sure how the newer revision chips work. The DS1620 chips are fairly cheap on eBay and several sellers have them. Check the discussion on the chips from 2010 that describes how to check the revision. https://www.mail-archive.com/search?l=time-n...@febo.com=subject:%22%5C%5Btime%5C-nuts%5C%5D+DS1620+Variants+in+the+Thunderbolt%22=newest=1 -Arthur ___ time-nuts mailing list -- time-nuts@lists.febo.com To unsubscribe, go to http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com and follow the instructions there.
[time-nuts] For sale - FTS 6006 Control and Monitor Module used by FTS 5030 cesium standard
If anyone is interested in a FTS 6006 control module please contact me off list - $150 ___ time-nuts mailing list -- time-nuts@lists.febo.com To unsubscribe, go to http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com and follow the instructions there.
[time-nuts] Confusion over Thunderbolt - noob is going crazy
Basically there is only one Thunderbolt. There are 2 firmware versions (2.2 & 3.0) and some of the earlier firmware version had a Piezo branded oscillator rather than the Trimble branded one and the Trimble one is somewhat better. The thick Thunderbolt package has a switching power supply mounted on top of the Thunderbolt that allows one voltage to supply the unit rather than the +5/+12/-12 used by the Thunderbolt proper. The sellers of the one with the power supply mounted on top seem to ask way more for the package than the cost of the included power supply would warrant. I have one of the 2.2 firmware version with a Trimble branded OCXO that I have used for years and it works perfectly for my use. Of the over 200 units I have sold there were only a couple of the 2.2 firmware versions and no Piezo OCXOs in all those. I’ve never seen or heard of a BNC antenna connector. Internal to the wireless locator where these Thunderbolt were used there was a cable to go from the type F connector on the Thunderbolt to the TNC connector on the rear panel of the locator. ___ time-nuts mailing list -- time-nuts@lists.febo.com To unsubscribe, go to http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com and follow the instructions there.
[time-nuts] Lucent KS-24361, aka HP/Symmetricom Z3812A
There are a number of oversights or mistakes in the previous post. First, I had an RFTG-u REF1/Z3812A modified and running as a stand- alone unit in 2010 four years before anyone else showed any interest in them. Here are the posts, below, that I made in the forums at that time to describe what I had done. So the RFTG-u REF1 (or at least one) were available long before 2014 and also modified long before 2014. After the RFTG-u REF1 started becoming widely available at a low price, others became interested in getting them and several other people used what I had done and found better ways to utilize and talk to/control them than I had. I still have my original RFTG-u REF1 that is still working just fine. I also have an HP Z3822A-A that looks like it was made in 1998 that I haven’t seen elsewhere and a modified EBSCTM that responds like a Trimble with an added built-in display and power supply. That was a very tight squeeze to get everything inside the small case. +++ Fri Jun 11 12:48:43 EDT 2010 “One of the GPSDOs I've had running for some time is an HP Z3811 with a a 1998 date code and a MTI 260 OXCO. Before you say I'm crazy, Z3811 is what the labels on the chips say. The name on the outside of the unit is Lucent RFTG-u REF1. Another similar Lucent unit had a clone of the 260, same size and pin out, but I have no idea if the specs are close, and that OXCO was an OFC MC895X4-015W with a 1999 date code. Both these OXCOs are 5.00Mhz. Like most Lucent units the RFTG-u REF1 was made to run with Another back-up unit for redundancy, needed an interconnect cable, and has no information available. I managed to figure out a way to make it work as a standalone unit and ran the 5Mhz from the OXCO thru a QBits amplifer to give me 5Mhz output instead of the Lucent standard of 15Mhz. I haven't carefully checked it against the other GPSDOs I have running but with the modifications I made to allow it to work solo, it seems to be a pretty good plug-and-play unit.” -Arthur ++ *Wed Oct 22 13:59:48 EDT 2014* “This was kind of my thinking on trying to use this Lucent unit as well. Way back on Fri Jun 11 16:48:43 UTC 2010 I posted about using one of these units I had modified but at the time there wasn't a single person who was interested. I have been using the RFTG-u REF1 since then and it is a nice unit. The modifications I added (including a power supply -see photo) allows the lights to cycle through their normal secquence on warm-up and the second unit isn't needed at all. I can't give you any reason why I used the general purpose transistors instead of a single IC quad inverter which might have worked as well or how I stumbled upon why I did what I did back then but it does work. Here's what I posted to Time-Nuts 4 years ago. …” ___ time-nuts mailing list -- time-nuts@lists.febo.com To unsubscribe, go to http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com and follow the instructions there.
[time-nuts] 10 MHz -> 16 MHz
Oops, I meant divide by 5 to get 2 followed by 8x NB3N511 work? ___ time-nuts mailing list -- time-nuts@lists.febo.com To unsubscribe, go to http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com and follow the instructions there.
[time-nuts] 10 MHz -> 16 MHz
Would a divide by 2 followed by a NB3N511 work? ___ time-nuts mailing list -- time-nuts@lists.febo.com To unsubscribe, go to http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com and follow the instructions there.
