[time-nuts] 5370 processor boards available
Boards from the second build of the 5370 processor replacement board project are now available. Details here: www.jks.com/5370/5370.html Please email me off-list with any non general-interest questions. Thanks, John ___ 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.
[time-nuts] WTB: GPS Antenna Splitter
Does anyone in the group have, or can point me to, a low-cost (but not cheap) 2-port splitter for a GPS antenna? Those on Ebay are rather expensive. I have two GPSDO units, and have both an older timing antenna and a new choke ring antenna (Thanks, Pete L). I already have one 2-port splitter (working well), but my intent is to connect both antennas through the splitters and a couple coaxial relays so that I can, with the twist of a switch, allow me to run each GPS from a different antenna, or both from the same antenna. I would like to gather some data as to the differences between the two antennas. I know I could switch the connections manually, but I like the idea of a switch to sort of automate the connections, and I'd need another splitter anyway. Before I go to the trouble and expense of building upon this idea, are there any comments as to the value of the project? Some questions come to mind: I'm thinking about mounting both antennas on the same mast, at the same elevation, just separated by a couple feet. Any problems that I should be aware of by putting both antennas so close together? Will that small distance have a noticeable effect when switching a receiver from one antenna to the other? Will the GPS notice the difference and want to do another survey? Thanks for your comments. Dave M ___ 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.
Re: [time-nuts] WTB: GPS Antenna Splitter
Dave, I had a 4-port GPS splitter, but sold it. I got mine from eBay. It was an HP unit and I got it cheap. You need to watch for a good price on eBay. I see two HP 4-way splitters on eBay for $73. Search for GPS distribution. As for the antenna, I use an HP timing antenna. I see some Nokia timing antennas for $25 on eBay. Joe On Oct 6, 2014 2:01 PM, Dave M dgmin...@mediacombb.net wrote: Does anyone in the group have, or can point me to, a low-cost (but not cheap) 2-port splitter for a GPS antenna? Those on Ebay are rather expensive. I have two GPSDO units, and have both an older timing antenna and a new choke ring antenna (Thanks, Pete L). I already have one 2-port splitter (working well), but my intent is to connect both antennas through the splitters and a couple coaxial relays so that I can, with the twist of a switch, allow me to run each GPS from a different antenna, or both from the same antenna. I would like to gather some data as to the differences between the two antennas. I know I could switch the connections manually, but I like the idea of a switch to sort of automate the connections, and I'd need another splitter anyway. Before I go to the trouble and expense of building upon this idea, are there any comments as to the value of the project? Some questions come to mind: I'm thinking about mounting both antennas on the same mast, at the same elevation, just separated by a couple feet. Any problems that I should be aware of by putting both antennas so close together? Will that small distance have a noticeable effect when switching a receiver from one antenna to the other? Will the GPS notice the difference and want to do another survey? Thanks for your comments. Dave M ___ 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. ___ 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.
[time-nuts] WTB: GPS Antenna Splitter
At the very low end, a F-cable splitter for like Cable TV will likely (*) get the job done. Many of us are already using RG-6 type cable for the GPS antenna run anyway. (*) Some GPS units may get confused if they have active sensing on the antenna preamp current and this goes out of tolerance. On Mon, Oct 6, 2014 at 4:01 PM, Dave M dgmin...@mediacombb.net javascript:_e(%7B%7D,'cvml','dgmin...@mediacombb.net'); wrote: Does anyone in the group have, or can point me to, a low-cost (but not cheap) 2-port splitter for a GPS antenna? Those on Ebay are rather expensive. I have two GPSDO units, and have both an older timing antenna and a new choke ring antenna (Thanks, Pete L). I already have one 2-port splitter (working well), but my intent is to connect both antennas through the splitters and a couple coaxial relays so that I can, with the twist of a switch, allow me to run each GPS from a different antenna, or both from the same antenna. I would like to gather some data as to the differences between the two antennas. I know I could switch the connections manually, but I like the idea of a switch to sort of automate the connections, and I'd need another splitter anyway. Before I go to the trouble and expense of building upon this idea, are there any comments as to the value of the project? Some questions come to mind: I'm thinking about mounting both antennas on the same mast, at the same elevation, just separated by a couple feet. Any problems that I should be aware of by putting both antennas so close together? Will that small distance have a noticeable effect when switching a receiver from one antenna to the other? Will the GPS notice the difference and want to do another survey? Thanks for your comments. Dave M ___ time-nuts mailing list -- time-nuts@febo.com javascript:_e(%7B%7D,'cvml','time-nuts@febo.com'); To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there. ___ 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.
Re: [time-nuts] WTB: GPS Antenna Splitter
Hi You might want to check the spacing spec’s on the antennas you have. Some of them have fairly large spacing recommendations (like 10 feet). Bob On Oct 6, 2014, at 4:01 PM, Dave M dgmin...@mediacombb.net wrote: Does anyone in the group have, or can point me to, a low-cost (but not cheap) 2-port splitter for a GPS antenna? Those on Ebay are rather expensive. I have two GPSDO units, and have both an older timing antenna and a new choke ring antenna (Thanks, Pete L). I already have one 2-port splitter (working well), but my intent is to connect both antennas through the splitters and a couple coaxial relays so that I can, with the twist of a switch, allow me to run each GPS from a different antenna, or both from the same antenna. I would like to gather some data as to the differences between the two antennas. I know I could switch the connections manually, but I like the idea of a switch to sort of automate the connections, and I'd need another splitter anyway. Before I go to the trouble and expense of building upon this idea, are there any comments as to the value of the project? Some questions come to mind: I'm thinking about mounting both antennas on the same mast, at the same elevation, just separated by a couple feet. Any problems that I should be aware of by putting both antennas so close together? Will that small distance have a noticeable effect when switching a receiver from one antenna to the other? Will the GPS notice the difference and want to do another survey? Thanks for your comments. Dave M ___ 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. ___ 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.
[time-nuts] Yokogawa TA320 Time Interval Analyzer
I see this on eBay http://m.ebay.com/itm/220505574616 Note that the seller has misspelled the manufacturers name. Has anyone used one? I have never even heard of this manufacturer - I guess it is Chinese. ___ 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.
Re: [time-nuts] Yokogawa TA320 Time Interval Analyzer
Hmm, I think they are Japanese: http://www.yokogawa.com/ydk/mr/marine/cs/ydkmr-ma-cs-contactus-top-en.htm Regards, John Westmoreland On Mon, Oct 6, 2014 at 4:14 PM, Dr. David Kirkby (Kirkby Microwave Ltd) drkir...@kirkbymicrowave.co.uk wrote: I see this on eBay http://m.ebay.com/itm/220505574616 Note that the seller has misspelled the manufacturers name. Has anyone used one? I have never even heard of this manufacturer - I guess it is Chinese. ___ 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. ___ 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.
Re: [time-nuts] Yokogawa TA320 Time Interval Analyzer
Yokagawa is/was a Japanese instrument manufacturer that was acquired by HP some 30 years ago, and for a number of years after that used the name Yokagawa-HP on their products. Vestiges of that operation still exist within Keysight. From Tom Holmes On Oct 6, 2014, at 7:14 PM, Dr. David Kirkby (Kirkby Microwave Ltd) drkir...@kirkbymicrowave.co.uk wrote: I see this on eBay http://m.ebay.com/itm/220505574616 Note that the seller has misspelled the manufacturers name. Has anyone used one? I have never even heard of this manufacturer - I guess it is Chinese. ___ 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. ___ 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.
Re: [time-nuts] Yokogawa TA320 Time Interval Analyzer
...Of which the venerable HP 4260A was born. As were others, including the futuristic HP 4191A. While these units were badged 'HP' and extremely well designed (by Yoko...) the 'feel' inside them, when you repair one of them, is definitely not up to HP stateside standards. (IMHO) http://www.hpmemory.org/wb_pages/wall_b_page_09.htm http://www.hpl.hp.com/hpjournal/pdfs/IssuePDFs/1980-01.pdf -Don KG5CID = -Original Message- From: Tommy phone Sent: Monday, October 06, 2014 6:44 PM To: Discussion of precise time and frequency measurement Subject: Re: [time-nuts] Yokogawa TA320 Time Interval Analyzer Yokagawa is/was a Japanese instrument manufacturer that was acquired by HP some 30 years ago, and for a number of years after that used the name Yokagawa-HP on their products. Vestiges of that operation still exist within Keysight. From Tom Holmes On Oct 6, 2014, at 7:14 PM, Dr. David Kirkby (Kirkby Microwave Ltd) drkir...@kirkbymicrowave.co.uk wrote: I see this on eBay http://m.ebay.com/itm/220505574616 Note that the seller has misspelled the manufacturers name. Has anyone used one? I have never even heard of this manufacturer - I guess it is Chinese. ___ 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. ___ 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. ___ 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.
Re: [time-nuts] Yokogawa TA320 Time Interval Analyzer
Dave, Should have included the main page for that instrument. Here it is: http://tmi.yokogawa.com/us/discontinued-products/other-test-measurement-instruments/time-interval-analyzers/ta320-time-interval-analyzer/ BillWB6BNQ Dr. David Kirkby (Kirkby Microwave Ltd) wrote: I see this on eBay http://m.ebay.com/itm/220505574616 Note that the seller has misspelled the manufacturers name. Has anyone used one? I have never even heard of this manufacturer - I guess it is Chinese. ___ 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. ___ 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.
Re: [time-nuts] Yokogawa TA320 Time Interval Analyzer
Hi Dave, Here is a link to the manual for that unit. http://tmi.yokogawa.com/files/uploaded/ta320spec.pdf BillWB6BNQ Dr. David Kirkby (Kirkby Microwave Ltd) wrote: I see this on eBay http://m.ebay.com/itm/220505574616 Note that the seller has misspelled the manufacturers name. Has anyone used one? I have never even heard of this manufacturer - I guess it is Chinese. ___ 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. ___ 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.
Re: [time-nuts] WTB: GPS Antenna Splitter
Hi Missed the survey question… If a ns in free air is about 1 foot (30 cm), then you probably want a survey that is better than 6” to keep the error down. You do not want to have the antennas on top of each other, so yes, the GPS will need a survey / location each time you change antennas. If you go with the 10’ spacing, then you will get some pretty big jumps without switching the location. Bob On Oct 6, 2014, at 4:01 PM, Dave M dgmin...@mediacombb.net wrote: Does anyone in the group have, or can point me to, a low-cost (but not cheap) 2-port splitter for a GPS antenna? Those on Ebay are rather expensive. I have two GPSDO units, and have both an older timing antenna and a new choke ring antenna (Thanks, Pete L). I already have one 2-port splitter (working well), but my intent is to connect both antennas through the splitters and a couple coaxial relays so that I can, with the twist of a switch, allow me to run each GPS from a different antenna, or both from the same antenna. I would like to gather some data as to the differences between the two antennas. I know I could switch the connections manually, but I like the idea of a switch to sort of automate the connections, and I'd need another splitter anyway. Before I go to the trouble and expense of building upon this idea, are there any comments as to the value of the project? Some questions come to mind: I'm thinking about mounting both antennas on the same mast, at the same elevation, just separated by a couple feet. Any problems that I should be aware of by putting both antennas so close together? Will that small distance have a noticeable effect when switching a receiver from one antenna to the other? Will the GPS notice the difference and want to do another survey? Thanks for your comments. Dave M ___ 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. ___ 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.
Re: [time-nuts] WTB: GPS Antenna Splitter
Dave, Can you please let us know what you go with for your splitter choice? I noticed companies like EndRun Technologies use ones from these folks: http://gpsnetworking.com/GPS-antenna-splitters.asp TESSCO might stock those if you ask them. Regards, John W. On Mon, Oct 6, 2014 at 6:09 PM, Bob Camp kb...@n1k.org wrote: Hi Missed the survey question… If a ns in free air is about 1 foot (30 cm), then you probably want a survey that is better than 6” to keep the error down. You do not want to have the antennas on top of each other, so yes, the GPS will need a survey / location each time you change antennas. If you go with the 10’ spacing, then you will get some pretty big jumps without switching the location. Bob On Oct 6, 2014, at 4:01 PM, Dave M dgmin...@mediacombb.net wrote: Does anyone in the group have, or can point me to, a low-cost (but not cheap) 2-port splitter for a GPS antenna? Those on Ebay are rather expensive. I have two GPSDO units, and have both an older timing antenna and a new choke ring antenna (Thanks, Pete L). I already have one 2-port splitter (working well), but my intent is to connect both antennas through the splitters and a couple coaxial relays so that I can, with the twist of a switch, allow me to run each GPS from a different antenna, or both from the same antenna. I would like to gather some data as to the differences between the two antennas. I know I could switch the connections manually, but I like the idea of a switch to sort of automate the connections, and I'd need another splitter anyway. Before I go to the trouble and expense of building upon this idea, are there any comments as to the value of the project? Some questions come to mind: I'm thinking about mounting both antennas on the same mast, at the same elevation, just separated by a couple feet. Any problems that I should be aware of by putting both antennas so close together? Will that small distance have a noticeable effect when switching a receiver from one antenna to the other? Will the GPS notice the difference and want to do another survey? Thanks for your comments. Dave M ___ 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. ___ 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. ___ 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.
Re: [time-nuts] WTB: GPS Antenna Splitter
Le 7 oct. 2014 à 03:09, Bob Camp a écrit : Hi Missed the survey question… If a ns in free air is about 1 foot (30 cm), then you probably want a survey that is better than 6” to keep the error down. You do not want to have the antennas on top of each other, so yes, the GPS will need a survey / location each time you change antennas. If you go with the 10’ spacing, then you will get some pretty big jumps without switching the location. Bob On Oct 6, 2014, at 4:01 PM, Dave M dgmin...@mediacombb.net wrote: Does anyone in the group have, or can point me to, a low-cost (but not cheap) 2-port splitter for a GPS antenna? Those on Ebay are rather expensive. I use micro-circuits power splitters, ZN4PD1-50-S+, to which I add DC blocking and load to all but one output which is used to power the antennas. Attenuation is low and port isolation adequate (at least I can detect no performance loss with 4 receivers connected). I have three now in service and haven't paid more than $60 a piece including transport from the US. I have also used 2 port ZN2PD-2000s, no relegated to the spares box. I have two GPSDO units, and have both an older timing antenna and a new choke ring antenna (Thanks, Pete L). I already have one 2-port splitter (working well), but my intent is to connect both antennas through the splitters and a couple coaxial relays so that I can, with the twist of a switch, allow me to run each GPS from a different antenna, or both from the same antenna. I would like to gather some data as to the differences between the two antennas. I know I could switch the connections manually, but I like the idea of a switch to sort of automate the connections, and I'd need another splitter anyway. Before I go to the trouble and expense of building upon this idea, are there any comments as to the value of the project? I haven't put coax switches in the paths but I do manually switch new receivers between the three different antennae that I have to see how they respond. I can detect, via the signal strength bars in the various GPS utilities, that there are differences in antenna performance, and receiver sensitivity, but have not seen any significant survey position differences from spec, though I only have patch antennae. I have done ADEV measurements and don't see any significant difference between different antenna sources. Before today I have not done any investigation on the effect of different antennae on PPS phase. So I am just eyeballing that of a ublox 6M as I type this. With all 3 antennae I do not see more than a few nano seconds phase offset using the same receiver . I am using a T-Bolt PPS to trigger the scope. However, the PPS does does slew around in time, maybe due to the relatively poor sky view that I have, or T-Bolt PPS issue. I have two receivers on the scope ( a Trimble SMT is the other which has been kept on the same antenna during the test) and both are showing the same issue. For a time-nut this looks like a useful field of investigation. Some questions come to mind: I'm thinking about mounting both antennas on the same mast, at the same elevation, just separated by a couple feet. Any problems that I should be aware of by putting both antennas so close together? Will that small distance have a noticeable effect when switching a receiver from one antenna to the other? Will the GPS notice the difference and want to do another survey? I have never seen any survey restart on antenna disconnect/reconnect . No effect on the T-Bolt, or Z3801A and I think that this only occurs on request or on power up depending on available date or receiver design. Thanks for your comments. Dave M ___ 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. ___ 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. ___ 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.
Re: [time-nuts] WTB: GPS Antenna Splitter
Hi: This works great and has minimal cost. http://www.prc68.com/I/4GPS.shtml Have Fun, Brooke Clarke http://www.PRC68.com http://www.end2partygovernment.com/2012Issues.html http://www.prc68.com/I/DietNutrition.html John C. Westmoreland, P.E. wrote: Dave, Can you please let us know what you go with for your splitter choice? I noticed companies like EndRun Technologies use ones from these folks: http://gpsnetworking.com/GPS-antenna-splitters.asp TESSCO might stock those if you ask them. Regards, John W. On Mon, Oct 6, 2014 at 6:09 PM, Bob Camp kb...@n1k.org wrote: Hi Missed the survey question… If a ns in free air is about 1 foot (30 cm), then you probably want a survey that is better than 6” to keep the error down. You do not want to have the antennas on top of each other, so yes, the GPS will need a survey / location each time you change antennas. If you go with the 10’ spacing, then you will get some pretty big jumps without switching the location. Bob On Oct 6, 2014, at 4:01 PM, Dave M dgmin...@mediacombb.net wrote: Does anyone in the group have, or can point me to, a low-cost (but not cheap) 2-port splitter for a GPS antenna? Those on Ebay are rather expensive. I have two GPSDO units, and have both an older timing antenna and a new choke ring antenna (Thanks, Pete L). I already have one 2-port splitter (working well), but my intent is to connect both antennas through the splitters and a couple coaxial relays so that I can, with the twist of a switch, allow me to run each GPS from a different antenna, or both from the same antenna. I would like to gather some data as to the differences between the two antennas. I know I could switch the connections manually, but I like the idea of a switch to sort of automate the connections, and I'd need another splitter anyway. Before I go to the trouble and expense of building upon this idea, are there any comments as to the value of the project? Some questions come to mind: I'm thinking about mounting both antennas on the same mast, at the same elevation, just separated by a couple feet. Any problems that I should be aware of by putting both antennas so close together? Will that small distance have a noticeable effect when switching a receiver from one antenna to the other? Will the GPS notice the difference and want to do another survey? Thanks for your comments. Dave M ___ 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. ___ 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. ___ 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. ___ 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.
