[time-nuts] Motorola M12+ or M12M questions
Hello, I have been asked a question from a friend and would like to hear what the time-nuts have to say about the M12+ and M12M GPS receivers. His questions were: 1) It would be great if you could outline the broad algorithm and bits of information that go into keeping the 1 pps aligned to UTC. I want to be able to can ensure that we're at least aware of all the subtle effects (such as illustrated in the next question). 2) along with the gps time signal, information is broadcast to relate gps time to utc. whenever there's a step change in these corrections (such as on midnight 31/12/2008), how does the unit react? 2.1) in particular, how quickly does the time code reflect the change, and is the 1pps affected in any way? Time-Nuts. Any help on these two questions would be appreciated Steve Jones ___ 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] 1 14 tpi UNS die
Does anyone (preferably in the UK) have 1.0-14UNS-2A thread cutting die they would be prepared to lend me (preferably a die nut type as I don't have a die stock)? Thanks David Partridge ___ 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] Motorola M12+ or M12M questions
2) along with the gps time signal, information is broadcast to relate gps time to utc. whenever there's a step change in these corrections (such as on midnight 31/12/2008), how does the unit react? 2.1) in particular, how quickly does the time code reflect the change, and is the 1pps affected in any way? Check the data sheet on the unit. It probably has a section describing the leap second stuff. They happen infrequently enough that you can usually get the info by other means. I'm sure the next one will be announced here. GPS works on GPS time. The satellites tell you the offset to UTC. I expect that offset kicks over at the magic time, but I wouldn't be surprised by bugs. Somebody may have data from watching the last time we had one. (I was watching a NMEA unit. It inserted the leap second at midnight GPS time rather than midnight UTC.) The PPS is tied to GPS time. I don't expect any quirks from leap seconds. -- These are my opinions, not necessarily my employer's. I hate spam. ___ 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] GPS Week 1536 causing problems?
M. Warner Losh wrote: In message: 4a52bd4f.5020...@rubidium.dyndns.org Magnus Danielson mag...@rubidium.dyndns.org writes: : Hal Murray wrote: : Anyone else lose an 18x? : : I lost one a while ago. Similar. It just stopped doing anything : useful. : : Battery failure? : : I don't think it has a battery inside. That seems like a poor design. Too : many reasonable use cases would include sitting in a drawer for extended : periods of time. : : Providing an RTC has benefits, especially when considering week-rollover : issues, since when the receiver wakes up it has no idea of date at all, : pulling in the RTC time and date is a sufficient hint, and adjusting : with detailed info from the GPS is a trivial extention. Then adjusting : the RTC is not a hard thing to do every once in a while. The same : problem could also be solved using EEPROM space. A byte would suffice. Usually, you're right. There's one case that might make it not suitable. Many contracts require spares for all the important gear. Long storage times makes storing the last known date ineffective. Of course in this case long is on the order of 9-odd years. This may be good for many applications, but not necessarily ones that have 10 or 15 year deep spares requirements... I agree that they are not suitable for that type of application. However, it does not make the battery unsuitable for GPSes as such, which was the point I was trying to make. How and if this detail springs to mind for any particular vendor is the issue. A flakey RTC may be more of a problem than a live one or a dead one. Cheers, Magnus ___ 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] GPS Week 1536 causing problems?
Hal Murray wrote: Providing an RTC has benefits, especially when considering week-rollover issues, since when the receiver wakes up it has no idea of date at all, pulling in the RTC time and date is a sufficient hint, and adjusting with detailed info from the GPS is a trivial extention. Then adjusting the RTC is not a hard thing to do every once in a while. The same problem could also be solved using EEPROM space. A byte would suffice. My comment about batteries was thinking of non-rechargable ones. There is no reasonable way to open the unit to replace a battery. What's the lifetime of a rechargeable battery? I guess it doesn't matter much if the capacity decreases a lot as long as the unit can recover when the battery is dead. My model of a GPS receiver is that it uses the time and ephemeris data to predict the frequencies to listen on. It needs to correct for Doppler. That's assuming the position hasn't changed (much). How long is an ephemeris good for? If it's too stale or the RTC has drifted too much then it might as well start cold. The ephimeris data could get you pretty good cold start even after a year or two, even if it is probably rated as dated anyway. If you haven't moved significantly since last fix (like different continent) it is enought to start tracking the right set of sats to get going. It takes 15 min to get a full ephimeris for the full constellation, and that only requires one single fix anyway. As soon as you get a fix you get the precission ephimeris anyway, and that is what you use for positioning, so the almenac is just for getting an initial fix. Storing ephimeris and last fix on CMOS SRAM with battery backup gives a head-start, which is more important for positioning GPSes than timing GPSes. Battery isn't meaningless, but maybe just not worth the trouble for some cases. Several GPSes have battery input from external, you could put a lead-cell or whatever there if you want. Cheers, Magnus ___ 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] 1 14 tpi UNS die
I don't recognize the size you are asking for. What is your application? -Chuck Harris David C. Partridge wrote: Does anyone (preferably in the UK) have 1.0-14UNS-2A thread cutting die they would be prepared to lend me (preferably a die nut type as I don't have a die stock)? Thanks David Partridge ___ 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] Motorola M12+ or M12M questions
Hal Murray wrote: 2) along with the gps time signal, information is broadcast to relate gps time to utc. whenever there's a step change in these corrections (such as on midnight 31/12/2008), how does the unit react? 2.1) in particular, how quickly does the time code reflect the change, and is the 1pps affected in any way? Check the data sheet on the unit. It probably has a section describing the leap second stuff. It is rarely beyond slogan level, if even mentioned in the datasheets. The manual rarely says much useful on the subject either. It happends from time to time that receivers freezes on leap seconds only for the stupid reasons it was not tested by the vendor. A simple single sat GPS emulator would have helped to trigger the bug, which is sufficient for timing receivers and should work for position receivers too. They happen infrequently enough that you can usually get the info by other means. I'm sure the next one will be announced here. There won't be one next new years even, it just became official yesterday. That was expected. GPS works on GPS time. The satellites tell you the offset to UTC. I expect that offset kicks over at the magic time, but I wouldn't be surprised by bugs. Somebody may have data from watching the last time we had one. (I was watching a NMEA unit. It inserted the leap second at midnight GPS time rather than midnight UTC.) OUPS! The PPS is tied to GPS time. I don't expect any quirks from leap seconds. If only listening to PPS and don't care about the time associated with it, you are safe. GPS time or UTC time should work equally well. I think you should fetch the GPS ICD 200 document and read up on the details in the signal structure on how UTC is represented in relationship to the GPS signal. Then imagine all the bugs there can be. There are (at least) three interpretations of when leap-seconds may be inserted: 1) At the end of every month. 2) At the end of every quarter. 3) At the end of every half-year. GPS is operated under the assumption that case 3 holds. There exist equipment assuming that case 2 holds. The actual definition allows for case 1, making case 3 the primary preference and case 2 the secondary preference. Lovely mess, isn't it? Anyway, if I don't recall it incorrectly (OK lazy to check), the GPS signal actually indicate WHEN then upcomming leap second will occur. This reduces to a up-comming leap second flag out of the GPS OEM board which can trigger pre-maturely execution of leap-second algorithm on the timing receiver, as we have seen in the Z3801A for instance. Cheers, Magnus ___ 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] 1 14 tpi UNS die
Panasonic VIC-100 GPS antenna ... Dave -Original Message- From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On Behalf Of Chuck Harris Sent: 07 July 2009 13:07 To: Discussion of precise time and frequency measurement Subject: Re: [time-nuts] 1 14 tpi UNS die I don't recognize the size you are asking for. What is your application? -Chuck Harris David C. Partridge wrote: Does anyone (preferably in the UK) have 1.0-14UNS-2A thread cutting die they would be prepared to lend me (preferably a die nut type as I don't have a die stock)? Thanks David Partridge ___ 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] 1 14 tpi UNS die
Ok, I will try this from a different angle. 1 - 14TPI UNS thread like you described are very rare outside of the large machine industry. They are used for things like bolts on tractors. I have a pretty big doubt that it has any application in a GPS antenna. US pipe thread in the sizes 1/2, 3/4, and 1 are 14TPI, they are not 1.0 inch in any dimension, however. It is pretty common to use standard pipe fittings in antenna work. So how did you arrive at needing a 1-14TPI UNS die? -Chuck Harris David C. Partridge wrote: Panasonic VIC-100 GPS antenna ... Dave -Original Message- From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On Behalf Of Chuck Harris Sent: 07 July 2009 13:07 To: Discussion of precise time and frequency measurement Subject: Re: [time-nuts] 1 14 tpi UNS die I don't recognize the size you are asking for. What is your application? -Chuck Harris David C. Partridge wrote: Does anyone (preferably in the UK) have 1.0-14UNS-2A thread cutting die they would be prepared to lend me (preferably a die nut type as I don't have a die stock)? Thanks David Partridge ___ 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] 1 14 tpi UNS die
Hi Dave, A 3/4 pipe thread die will also work. Both NPT and BSP are 14tpi and have approx 1 major diameter. Try taking your bit of pipe to a gas fitter. Clarke sell a multi-die kit for £35 inc VAT, http://www.machinemart.co.uk/shop/product/details/cht392-6-piece-pipe-threading-kit Regards, Robert G8RPI. --- On Tue, 7/7/09, David C. Partridge david.partri...@dsl.pipex.com wrote: From: David C. Partridge david.partri...@dsl.pipex.com Subject: Re: [time-nuts] 1 14 tpi UNS die To: 'Discussion of precise time and frequency measurement' time-nuts@febo.com Date: Tuesday, 7 July, 2009, 1:20 PM Panasonic VIC-100 GPS antenna ... Dave -Original Message- From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On Behalf Of Chuck Harris Sent: 07 July 2009 13:07 To: Discussion of precise time and frequency measurement Subject: Re: [time-nuts] 1 14 tpi UNS die I don't recognize the size you are asking for. What is your application? -Chuck Harris David C. Partridge wrote: Does anyone (preferably in the UK) have 1.0-14UNS-2A thread cutting die they would be prepared to lend me (preferably a die nut type as I don't have a die stock)? Thanks David Partridge ___ 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.
Re: [time-nuts] 1 14 tpi UNS die
Hi Dave, Check with your local plumbing-store. In Sweden the old inch based pipe thread lives on, slightly renamed. Se attached .jpg for approximate inside/outside diameters. The pipes are sold in 6m lenghts threaded in both ends. Good luck in your search! -- Björn Panasonic VIC-100 GPS antenna ... Dave -Original Message- From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On Behalf Of Chuck Harris Sent: 07 July 2009 13:07 To: Discussion of precise time and frequency measurement Subject: Re: [time-nuts] 1 14 tpi UNS die I don't recognize the size you are asking for. What is your application? -Chuck Harris David C. Partridge wrote: Does anyone (preferably in the UK) have 1.0-14UNS-2A thread cutting die they would be prepared to lend me (preferably a die nut type as I don't have a die stock)? Thanks David Partridge ___ 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. attachment: pipe_dimentions.jpg___ 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] 1 14 tpi UNS die
I tried a 3/4 BSP but that didn't quite fit. NPT is probably right ... -Original Message- From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On Behalf Of Robert Atkinson Sent: 07 July 2009 14:07 To: Discussion of precise time and frequency measurement Subject: Re: [time-nuts] 1 14 tpi UNS die Hi Dave, A 3/4 pipe thread die will also work. Both NPT and BSP are 14tpi and have approx 1 major diameter. Try taking your bit of pipe to a gas fitter. Clarke sell a multi-die kit for £35 inc VAT, http://www.machinemart.co.uk/shop/product/details/cht392-6-piece-pipe-thread ing-kit Regards, Robert G8RPI. --- On Tue, 7/7/09, David C. Partridge david.partri...@dsl.pipex.com wrote: From: David C. Partridge david.partri...@dsl.pipex.com Subject: Re: [time-nuts] 1 14 tpi UNS die To: 'Discussion of precise time and frequency measurement' time-nuts@febo.com Date: Tuesday, 7 July, 2009, 1:20 PM Panasonic VIC-100 GPS antenna ... Dave -Original Message- From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On Behalf Of Chuck Harris Sent: 07 July 2009 13:07 To: Discussion of precise time and frequency measurement Subject: Re: [time-nuts] 1 14 tpi UNS die I don't recognize the size you are asking for. What is your application? -Chuck Harris David C. Partridge wrote: Does anyone (preferably in the UK) have 1.0-14UNS-2A thread cutting die they would be prepared to lend me (preferably a die nut type as I don't have a die stock)? Thanks David Partridge ___ 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. ___ 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] 1 14 tpi UNS die
http://pewa.panasonic.com/emp/products/gps_pdf/vic100.pdf is where I got the specification for the thread from. Pipe has O.D. of 1. Dave -Original Message- From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On Behalf Of Chuck Harris Sent: 07 July 2009 13:57 To: Discussion of precise time and frequency measurement Subject: Re: [time-nuts] 1 14 tpi UNS die Ok, I will try this from a different angle. 1 - 14TPI UNS thread like you described are very rare outside of the large machine industry. They are used for things like bolts on tractors. I have a pretty big doubt that it has any application in a GPS antenna. US pipe thread in the sizes 1/2, 3/4, and 1 are 14TPI, they are not 1.0 inch in any dimension, however. It is pretty common to use standard pipe fittings in antenna work. So how did you arrive at needing a 1-14TPI UNS die? -Chuck Harris David C. Partridge wrote: Panasonic VIC-100 GPS antenna ... Dave -Original Message- From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On Behalf Of Chuck Harris Sent: 07 July 2009 13:07 To: Discussion of precise time and frequency measurement Subject: Re: [time-nuts] 1 14 tpi UNS die I don't recognize the size you are asking for. What is your application? -Chuck Harris David C. Partridge wrote: Does anyone (preferably in the UK) have 1.0-14UNS-2A thread cutting die they would be prepared to lend me (preferably a die nut type as I don't have a die stock)? Thanks David Partridge ___ 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] 1 14 tpi UNS die
This is the standard Marine antenna mount I believe. Dave -Original Message- From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On Behalf Of David C. Partridge Sent: 07 July 2009 14:47 To: 'Discussion of precise time and frequency measurement' Subject: Re: [time-nuts] 1 14 tpi UNS die http://pewa.panasonic.com/emp/products/gps_pdf/vic100.pdf is where I got the specification for the thread from. Pipe has O.D. of 1. Dave -Original Message- From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On Behalf Of Chuck Harris Sent: 07 July 2009 13:57 To: Discussion of precise time and frequency measurement Subject: Re: [time-nuts] 1 14 tpi UNS die Ok, I will try this from a different angle. 1 - 14TPI UNS thread like you described are very rare outside of the large machine industry. They are used for things like bolts on tractors. I have a pretty big doubt that it has any application in a GPS antenna. US pipe thread in the sizes 1/2, 3/4, and 1 are 14TPI, they are not 1.0 inch in any dimension, however. It is pretty common to use standard pipe fittings in antenna work. So how did you arrive at needing a 1-14TPI UNS die? -Chuck Harris David C. Partridge wrote: Panasonic VIC-100 GPS antenna ... Dave -Original Message- From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On Behalf Of Chuck Harris Sent: 07 July 2009 13:07 To: Discussion of precise time and frequency measurement Subject: Re: [time-nuts] 1 14 tpi UNS die I don't recognize the size you are asking for. What is your application? -Chuck Harris David C. Partridge wrote: Does anyone (preferably in the UK) have 1.0-14UNS-2A thread cutting die they would be prepared to lend me (preferably a die nut type as I don't have a die stock)? Thanks David Partridge ___ 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] 1 14 tpi UNS die
Hi Dave, That would 3/4 inch NPT (National Pipe Thread). In the UK it is known as Gas Pipe. As far as I can tell, it is standard the world over. There are some differences, that won't matter in your application. In Europe, NPT is frequently not tapered. This is apparently the result of not understanding that tapered pipe thread is self sealing. As a result, there have been all sorts of o-ring jamb nuts and other insane stuff done over there to try and form a temporary seal... but I digress. -Chuck Harris David C. Partridge wrote: http://pewa.panasonic.com/emp/products/gps_pdf/vic100.pdf is where I got the specification for the thread from. Pipe has O.D. of 1. Dave ___ 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] Motorola M12+ or M12M questions
Martyn Smith wrote: Hello, I have been asked a question from a friend and would like to hear what the time-nuts have to say about the M12+ and M12M GPS receivers. His questions were: 1) It would be great if you could outline the broad algorithm and bits of information that go into keeping the 1 pps aligned to UTC. I want to be able to can ensure that we're at least aware of all the subtle effects (such as illustrated in the next question). 2) along with the gps time signal, information is broadcast to relate gps time to utc. whenever there's a step change in these corrections (such as on midnight 31/12/2008), how does the unit react? 2.1) in particular, how quickly does the time code reflect the change, and is the 1pps affected in any way? Time-Nuts. Any help on these two questions would be appreciated Steve Jones Your friend should download the manual from the Synergy-GPS website. http://www.synergy-gps.com/ Page 114 of the M12+ Timing receiver manual says: LEAP SECOND STATUS MESSAGE (@@Bj) Applicability: M12+ Timing and Positioning Receivers This message polls the receiver for current leap second status information that has been decoded from the Navigation Data message received from the GPS satellites. The data sent back by the receiver provides specific date and time information pertaining to any future leap second addition or subtraction. Leap seconds are occasionally inserted in UTC and generally occur on midnight UTC June 30th or midnight UTC December 31st. The GPS control segment typically notifies GPS users of pending leap second insertions to UTC several weeks before the event. When a leap second is inserted, the time of day will show a value of '60' in the seconds field. When a leap second is removed, the date will roll over at 58 seconds. The 'current UTC offset' will be zero if the receiver is set up to run in GPS time mode instead of UTC. Default mode: Polled Legacy Compatibility: The @@Bj message was used in an identical manner in virtually all Motorola receivers. --- Graham == ___ 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] 1 14 tpi UNS die
I think it is also known as 3/4 NPT for a pipe with a nominal OD of 1.05 Dave -Original Message- From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On Behalf Of David C. Partridge Sent: 07 July 2009 14:54 To: 'Discussion of precise time and frequency measurement' Subject: Re: [time-nuts] 1 14 tpi UNS die This is the standard Marine antenna mount I believe. Dave -Original Message- From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On Behalf Of David C. Partridge Sent: 07 July 2009 14:47 To: 'Discussion of precise time and frequency measurement' Subject: Re: [time-nuts] 1 14 tpi UNS die http://pewa.panasonic.com/emp/products/gps_pdf/vic100.pdf is where I got the specification for the thread from. Pipe has O.D. of 1. Dave -Original Message- From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On Behalf Of Chuck Harris Sent: 07 July 2009 13:57 To: Discussion of precise time and frequency measurement Subject: Re: [time-nuts] 1 14 tpi UNS die Ok, I will try this from a different angle. 1 - 14TPI UNS thread like you described are very rare outside of the large machine industry. They are used for things like bolts on tractors. I have a pretty big doubt that it has any application in a GPS antenna. US pipe thread in the sizes 1/2, 3/4, and 1 are 14TPI, they are not 1.0 inch in any dimension, however. It is pretty common to use standard pipe fittings in antenna work. So how did you arrive at needing a 1-14TPI UNS die? -Chuck Harris David C. Partridge wrote: Panasonic VIC-100 GPS antenna ... Dave -Original Message- From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On Behalf Of Chuck Harris Sent: 07 July 2009 13:07 To: Discussion of precise time and frequency measurement Subject: Re: [time-nuts] 1 14 tpi UNS die I don't recognize the size you are asking for. What is your application? -Chuck Harris David C. Partridge wrote: Does anyone (preferably in the UK) have 1.0-14UNS-2A thread cutting die they would be prepared to lend me (preferably a die nut type as I don't have a die stock)? Thanks David Partridge ___ 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.
Re: [time-nuts] 1 14 tpi UNS die
Chuck, In France, Gas Pipe threads are tappered. However, I do not remember if they follow the Metric or British standard for size... Didier -Original Message- From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On Behalf Of Chuck Harris Sent: Tuesday, July 07, 2009 9:33 AM To: Discussion of precise time and frequency measurement Subject: Re: [time-nuts] 1 14 tpi UNS die Hi Dave, That would 3/4 inch NPT (National Pipe Thread). In the UK it is known as Gas Pipe. As far as I can tell, it is standard the world over. There are some differences, that won't matter in your application. In Europe, NPT is frequently not tapered. This is apparently the result of not understanding that tapered pipe thread is self sealing. As a result, there have been all sorts of o-ring jamb nuts and other insane stuff done over there to try and form a temporary seal... but I digress. -Chuck Harris David C. Partridge wrote: http://pewa.panasonic.com/emp/products/gps_pdf/vic100.pdf is where I got the specification for the thread from. Pipe has O.D. of 1. Dave ___ 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] 1 14 tpi UNS die
That is known over here as BSP (British Standard Pipe), or more pickily, BSPP (last P=Parallel) aka British Gas), there is also BSPT (T= Taper). I tried a BSP parallel 3/4 (also used for plumbing over here) but it doesn't (quite) fit. Dave -Original Message- From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On Behalf Of Chuck Harris Sent: 07 July 2009 15:33 To: Discussion of precise time and frequency measurement Subject: Re: [time-nuts] 1 14 tpi UNS die Hi Dave, That would 3/4 inch NPT (National Pipe Thread). In the UK it is known as Gas Pipe. As far as I can tell, it is standard the world over. There are some differences, that won't matter in your application. In Europe, NPT is frequently not tapered. This is apparently the result of not understanding that tapered pipe thread is self sealing. As a result, there have been all sorts of o-ring jamb nuts and other insane stuff done over there to try and form a temporary seal... but I digress. -Chuck Harris David C. Partridge wrote: http://pewa.panasonic.com/emp/products/gps_pdf/vic100.pdf is where I got the specification for the thread from. Pipe has O.D. of 1. Dave ___ 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] Thunderbolt buy .. another ?
Is there another planned Thunderbolt group buy ? -pete ___ 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] Motorola M12+ or M12M questions
In message: 4a533c36.1030...@rubidium.dyndns.org Magnus Danielson mag...@rubidium.dyndns.org writes: : There are (at least) three interpretations of when leap-seconds may be : inserted: : 1) At the end of every month. This is the ITU standard. It says that leap seconds can be inserted at the end of each month. Almost no gear allows this, and the gear that does doesn't always do it in a sane way. : 2) At the end of every quarter. This is also ITU standard. These are the secondary times. They have never been used. : 3) At the end of every half-year. These are the primary times. : GPS is operated under the assumption that case 3 holds. Why is this the case? The GPS data just tells you which week the next leap second will happen, as well as the last time a leap second happened. How is it the case that you can say that 3 holds? : There exist equipment assuming that case 2 holds. : The actual definition allows for case 1, making case 3 the primary : preference and case 2 the secondary preference. Yes. : Lovely mess, isn't it? Leap seconds are evil and must die. For such a simple thing, there's so much complication that getting leap seconds right can be rather hard. At least there's no leap second this December... : Anyway, if I don't recall it incorrectly (OK lazy to check), the GPS : signal actually indicate WHEN then upcomming leap second will occur. : This reduces to a up-comming leap second flag out of the GPS OEM board : which can trigger pre-maturely execution of leap-second algorithm on the : timing receiver, as we have seen in the Z3801A for instance. You are correct. There's an indication when the next leap second will happen. The Z3801A uses this to turn on a simple 'leap second pending' which causes a leap second to happen at the next leap second opportunity rather than at the week published. The GPS operators turn on next leap second about 4 or 5 months early, which triggers the bug. Warner ___ 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] 1 14 tpi UNS die
I think Rigid Metal Electrical Conduit (RMC) uses similar threads to NPT, but are not tapered. I mean the thick stuff, not EMT. -John == Hi Dave, That would 3/4 inch NPT (National Pipe Thread). In the UK it is known as Gas Pipe. As far as I can tell, it is standard the world over. There are some differences, that won't matter in your application. In Europe, NPT is frequently not tapered. This is apparently the result of not understanding that tapered pipe thread is self sealing. As a result, there have been all sorts of o-ring jamb nuts and other insane stuff done over there to try and form a temporary seal... but I digress. -Chuck Harris David C. Partridge wrote: http://pewa.panasonic.com/emp/products/gps_pdf/vic100.pdf is where I got the specification for the thread from. Pipe has O.D. of 1. Dave ___ 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] 1 14 tpi UNS die
Hi Didier, Gas pipe, as far as I know is always tapered. In Norway, Sweden, Denmark, Italy, etc... They use gas pipe for hot water heating systems... only they use straight threads, with a jamb nut to squash an O-ring up against the fixture. The nut has a bevel that presses the O-ring into the pipe's threads, and affects a semi-seal. It is a one time affair, and in my experience lasts about two heating seasons before it starts dripping. I guess a benefit is it keeps the room humidity up in the winter... sigh! -Chuck Harris Didier Juges wrote: Chuck, In France, Gas Pipe threads are tappered. However, I do not remember if they follow the Metric or British standard for size... Didier -Original Message- From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On Behalf Of Chuck Harris Sent: Tuesday, July 07, 2009 9:33 AM To: Discussion of precise time and frequency measurement Subject: Re: [time-nuts] 1 14 tpi UNS die Hi Dave, That would 3/4 inch NPT (National Pipe Thread). In the UK it is known as Gas Pipe. As far as I can tell, it is standard the world over. There are some differences, that won't matter in your application. In Europe, NPT is frequently not tapered. This is apparently the result of not understanding that tapered pipe thread is self sealing. As a result, there have been all sorts of o-ring jamb nuts and other insane stuff done over there to try and form a temporary seal... but I digress. -Chuck Harris David C. Partridge wrote: http://pewa.panasonic.com/emp/products/gps_pdf/vic100.pdf is where I got the specification for the thread from. Pipe has O.D. of 1. Dave ___ 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] 1 14 tpi UNS die
I have the same problem with several GPS antennas, a Quadrifilar from Raytheon, Irvine 2640NW with mounting base, HP 58532A with mounting base, HP 58504Ac. etc. Some complete boxes from HP do contain an adapter. So this thread is definitively a kind of standard. The thread is fully cylindrical, all the plumbers tubes do use conical threads which are not compatible. Very difficult to find proper solution in the metrical Europe. If I would find a source of that HP-adapters I would buy 4 units. I did not check for the correct naming of this thread though. regards Arnold On Tue, 7 Jul 2009 15:23:42 +0100, David C. Partridge wrote: I think it is also known as 3/4 NPT for a pipe with a nominal OD of 1.05 Dave -Original Message- From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On Behalf Of David C. Partridge Sent: 07 July 2009 14:54 To: 'Discussion of precise time and frequency measurement' Subject: Re: [time-nuts] 1 14 tpi UNS die This is the standard Marine antenna mount I believe. Dave -Original Message- From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On Behalf Of David C. Partridge Sent: 07 July 2009 14:47 To: 'Discussion of precise time and frequency measurement' Subject: Re: [time-nuts] 1 14 tpi UNS die http://pewa.panasonic.com/emp/products/gps_pdf/vic100.pdf is where I got the specification for the thread from. Pipe has O.D. of 1. Dave -Original Message- From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On Behalf Of Chuck Harris Sent: 07 July 2009 13:57 To: Discussion of precise time and frequency measurement Subject: Re: [time-nuts] 1 14 tpi UNS die Ok, I will try this from a different angle. 1 - 14TPI UNS thread like you described are very rare outside of the large machine industry. They are used for things like bolts on tractors. I have a pretty big doubt that it has any application in a GPS antenna. US pipe thread in the sizes 1/2, 3/4, and 1 are 14TPI, they are not 1.0 inch in any dimension, however. It is pretty common to use standard pipe fittings in antenna work. So how did you arrive at needing a 1-14TPI UNS die? -Chuck Harris David C. Partridge wrote: Panasonic VIC-100 GPS antenna ... Dave -Original Message- From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On Behalf Of Chuck Harris Sent: 07 July 2009 13:07 To: Discussion of precise time and frequency measurement Subject: Re: [time-nuts] 1 14 tpi UNS die I don't recognize the size you are asking for. What is your application? -Chuck Harris David C. Partridge wrote: Does anyone (preferably in the UK) have 1.0-14UNS-2A thread cutting die they would be prepared to lend me (preferably a die nut type as I don't have a die stock)? Thanks David Partridge ___ 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. ___ 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] 1 14 tpi UNS die
In a message dated 07/07/2009 18:43:55 GMT Daylight Time, arnold.ti...@gmx.de writes: I have the same problem with several GPS antennas, a Quadrifilar from Raytheon, Irvine 2640NW with mounting base, HP 58532A with mounting base, HP 58504Ac. etc. Some complete boxes from HP do contain an adapter. So this thread is definitively a kind of standard. The thread is fully cylindrical, all the plumbers tubes do use conical threads which are not compatible. Very difficult to find proper solution in the metrical Europe. If I would find a source of that HP-adapters I would buy 4 units. I did not check for the correct naming of this thread though. --- As commented previously, this is a common fitting and fairly standard for GPS antennas and some other antenna kit, especially in a marine environment. A variety of adaptors is available from marine suppliers ranging from expensive stainless steel fittings to much cheaper plastic, they are also regularly listed on Ebay. However, there doesn't seem to be anything readilly available which has a collar to sit over a plain pipe, which I suspect might meet David's needs. They are widely available with a flange fitting, for mounting to flat surfaces, or rail fittings to attach to horizontal deck rails, but perhaps a trawl through some of the marine suppliers might throw up something else that could do the job without the need for threading the end of the pipe. regards Nigel GM8PZR ___ 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] 1 14 tpi UNS die
I have to fill the Trimble Bullet III into the list of antennas with this thread. Here are some mounting adapters shown: http://www.dpie.com/gps/bullet3.html Arnold On Tue, 7 Jul 2009 15:23:42 +0100, David C. Partridge wrote: I think it is also known as 3/4 NPT for a pipe with a nominal OD of 1.05 Dave -Original Message- From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On Behalf Of David C. Partridge Sent: 07 July 2009 14:54 To: 'Discussion of precise time and frequency measurement' Subject: Re: [time-nuts] 1 14 tpi UNS die This is the standard Marine antenna mount I believe. Dave -Original Message- From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On Behalf Of David C. Partridge Sent: 07 July 2009 14:47 To: 'Discussion of precise time and frequency measurement' Subject: Re: [time-nuts] 1 14 tpi UNS die http://pewa.panasonic.com/emp/products/gps_pdf/vic100.pdf is where I got the specification for the thread from. Pipe has O.D. of 1. Dave -Original Message- From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On Behalf Of Chuck Harris Sent: 07 July 2009 13:57 To: Discussion of precise time and frequency measurement Subject: Re: [time-nuts] 1 14 tpi UNS die Ok, I will try this from a different angle. 1 - 14TPI UNS thread like you described are very rare outside of the large machine industry. They are used for things like bolts on tractors. I have a pretty big doubt that it has any application in a GPS antenna. US pipe thread in the sizes 1/2, 3/4, and 1 are 14TPI, they are not 1.0 inch in any dimension, however. It is pretty common to use standard pipe fittings in antenna work. So how did you arrive at needing a 1-14TPI UNS die? -Chuck Harris David C. Partridge wrote: Panasonic VIC-100 GPS antenna ... Dave -Original Message- From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On Behalf Of Chuck Harris Sent: 07 July 2009 13:07 To: Discussion of precise time and frequency measurement Subject: Re: [time-nuts] 1 14 tpi UNS die I don't recognize the size you are asking for. What is your application? -Chuck Harris David C. Partridge wrote: Does anyone (preferably in the UK) have 1.0-14UNS-2A thread cutting die they would be prepared to lend me (preferably a die nut type as I don't have a die stock)? Thanks David Partridge ___ 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] 1 14 tpi UNS die
As it would appear to an expensive option to purchase the appropriate dies over here, and as the pipe is soft alloy, I've just reduced its diameter a bit so it's an tight push fit in the antenna base (for now) - though still hoping to find a good solution with spending lots of dosh! Thanks to all Dave -Original Message- From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On Behalf Of gandal...@aol.com Sent: 07 July 2009 18:54 To: time-nuts@febo.com Subject: Re: [time-nuts] 1 14 tpi UNS die In a message dated 07/07/2009 18:43:55 GMT Daylight Time, arnold.ti...@gmx.de writes: I have the same problem with several GPS antennas, a Quadrifilar from Raytheon, Irvine 2640NW with mounting base, HP 58532A with mounting base, HP 58504Ac. etc. Some complete boxes from HP do contain an adapter. So this thread is definitively a kind of standard. The thread is fully cylindrical, all the plumbers tubes do use conical threads which are not compatible. Very difficult to find proper solution in the metrical Europe. If I would find a source of that HP-adapters I would buy 4 units. I did not check for the correct naming of this thread though. --- As commented previously, this is a common fitting and fairly standard for GPS antennas and some other antenna kit, especially in a marine environment. A variety of adaptors is available from marine suppliers ranging from expensive stainless steel fittings to much cheaper plastic, they are also regularly listed on Ebay. However, there doesn't seem to be anything readilly available which has a collar to sit over a plain pipe, which I suspect might meet David's needs. They are widely available with a flange fitting, for mounting to flat surfaces, or rail fittings to attach to horizontal deck rails, but perhaps a trawl through some of the marine suppliers might throw up something else that could do the job without the need for threading the end of the pipe. regards Nigel GM8PZR ___ 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] 1 14 tpi UNS die
Hi, Not Euro-local, but you can find different adapters in Antcoms product range. http://www.antcom.com/products/catalogs.html http://www.antcom.com/documents/catalogs/PeripheralAntennaProducts2.pdf The Trimble Acutime/Palisade antennas also use this thread. -- Björn In a message dated 07/07/2009 18:43:55 GMT Daylight Time, arnold.ti...@gmx.de writes: I have the same problem with several GPS antennas, a Quadrifilar from Raytheon, Irvine 2640NW with mounting base, HP 58532A with mounting base, HP 58504Ac. etc. Some complete boxes from HP do contain an adapter. So this thread is definitively a kind of standard. The thread is fully cylindrical, all the plumbers tubes do use conical threads which are not compatible. Very difficult to find proper solution in the metrical Europe. If I would find a source of that HP-adapters I would buy 4 units. I did not check for the correct naming of this thread though. --- As commented previously, this is a common fitting and fairly standard for GPS antennas and some other antenna kit, especially in a marine environment. A variety of adaptors is available from marine suppliers ranging from expensive stainless steel fittings to much cheaper plastic, they are also regularly listed on Ebay. However, there doesn't seem to be anything readilly available which has a collar to sit over a plain pipe, which I suspect might meet David's needs. They are widely available with a flange fitting, for mounting to flat surfaces, or rail fittings to attach to horizontal deck rails, but perhaps a trawl through some of the marine suppliers might throw up something else that could do the job without the need for threading the end of the pipe. regards Nigel GM8PZR ___ 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] 1 14 tpi UNS die
b...@lysator.liu.se wrote: Hi Chuck, Been living in Sweden my whole life. And almost exclusivly in houses heated by circulating hot water through radiators. I have yet to spot an O-ring. Where in Sweden did you see this strange system? Hi Bjorn, In the US, hydronic heat comes in a couple of flavors: The old fashioned cast iron radiators, fin/coil baseboard radiators, radiant baseboard, or steel radiators/towel warmers imported from the Europe. Most of the European systems are geared towards PEX tubing, and compression fittings... and untapered pipe thread with jamb nuts and O-rings. The US cast iron radiators all use tapered pipe thread, fin coil is almost always soldered copper, and the steel radiators from Sweden/Denmark/Norway/Switzerland, and Italy, all have straight pipe thread, and use a Jamb nut with an O-ring. Runtal, Cordivari, Wirsbro and Wesaunard are examples I have run into. I have also run into this system in shut-off valves, manifolds, flow control valves, air eliminators, ... all coming from Europe. Do you install and repair systems? Or just live with them? -Chuck Harris ___ 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] Thunderbolt buy .. another ?
From: Pete Lancashire p...@petelancashire.com To: time-nuts@febo.com Is there another planned Thunderbolt group buy ? -pete Very close to an announcement. Just waiting to resolve one administrative issue and we'll be ready. -- 73, John, W9DDD ___ 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] 1 14 tpi UNS die
How about http://shakespeare-marine.com/mountshow.asp?findmount=4721 Under $18 adjustable angle. or http://shakespeare-marine.com/mountshow.asp?findmount=4720 $25 Not slip over the top of a pole but pretty universal. They are available in the UK from ships chandlers. Robert G8RPI. --- On Tue, 7/7/09, Arnold Tibus arnold.ti...@gmx.de wrote: From: Arnold Tibus arnold.ti...@gmx.de Subject: Re: [time-nuts] 1 14 tpi UNS die To: Discussion of precise time and frequency measurement time-nuts@febo.com Date: Tuesday, 7 July, 2009, 7:10 PM Nigel and the group, this very useful adapter is what is needed and I am looking for as well. regards Arnold On Tue, 7 Jul 2009 13:53:55 EDT, gandal...@aol.com wrote: In a message dated 07/07/2009 18:43:55 GMT Daylight Time, arnold.ti...@gmx.de writes: I have the same problem with several GPS antennas, a Quadrifilar from Raytheon, Irvine 2640NW with mounting base, HP 58532A with mounting base, HP 58504Ac. etc. Some complete boxes from HP do contain an adapter. So this thread is definitively a kind of standard. The thread is fully cylindrical, all the plumbers tubes do use conical threads which are not compatible. Very difficult to find proper solution in the metrical Europe. If I would find a source of that HP-adapters I would buy 4 units. I did not check for the correct naming of this thread though. --- As commented previously, this is a common fitting and fairly standard for GPS antennas and some other antenna kit, especially in a marine environment. A variety of adaptors is available from marine suppliers ranging from expensive stainless steel fittings to much cheaper plastic, they are also regularly listed on Ebay. However, there doesn't seem to be anything readilly available which has a collar to sit over a plain pipe, which I suspect might meet David's needs. They are widely available with a flange fitting, for mounting to flat surfaces, or rail fittings to attach to horizontal deck rails, but perhaps a trawl through some of the marine suppliers might throw up something else that could do the job without the need for threading the end of the pipe. regards Nigel GM8PZR ___ 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. -Inline Attachment Follows- ___ 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] 1 14 tpi UNS die
In a message dated 07/07/2009 19:14:01 GMT Daylight Time, arnold.ti...@gmx.de writes: Nigel and the group, this very useful adapter is what is needed and I am looking for as well. - Hi Arnold That looks ideal, and good quality too, but I suppose the problem with that and with my similar suggestion for a collar is that pipe sizes vary, so it will either need to be available in different sizes or adapters provided. I don't see any problem with that but it might start to get expensive for home use. When I finally get round to mounting my timing antennas outdoors, so far my little Motorola magnetic patches seem to see an awful lot of sky from indoors, if I can't find a similar adapter that fits I'll probably just use a standard mast clamp arrangement with a 90 degree bracket and fix one of the cheap plastic mounts to that. Not so neat, and a bit more wind resistance, but not too much hassle either:-) regards Nigel ___ 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] 1 14 tpi UNS die
Hi guys, I'm using a piece of 1/2 PVC pipe with my Panasonic gps antenna on top. The weight and friction of the cable below it will pretty much prevent it from lifting off the pipe, probably even in a hurricane. I didn't even bother with silicone sealant because the threaded part overlaps by a good inch over the outside of the pipe. -Bob On Tue, Jul 7, 2009 at 2:06 PM, gandal...@aol.com wrote: In a message dated 07/07/2009 19:14:01 GMT Daylight Time, arnold.ti...@gmx.de writes: Nigel and the group, this very useful adapter is what is needed and I am looking for as well. - Hi Arnold That looks ideal, and good quality too, but I suppose the problem with that and with my similar suggestion for a collar is that pipe sizes vary, so it will either need to be available in different sizes or adapters provided. I don't see any problem with that but it might start to get expensive for home use. When I finally get round to mounting my timing antennas outdoors, so far my little Motorola magnetic patches seem to see an awful lot of sky from indoors, if I can't find a similar adapter that fits I'll probably just use a standard mast clamp arrangement with a 90 degree bracket and fix one of the cheap plastic mounts to that. Not so neat, and a bit more wind resistance, but not too much hassle either:-) regards Nigel ___ 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] 1 14 tpi UNS die
Hi Dave, I was curious that BSP did not fit. I just grabbed some hardware to try. A 3/4 BSP blank just fitted a Trimble pallisade but not the female end of a Shakespeare short mast. The trimble spec says 1-14TPI or 3/4NPT. It is looser on the shakespeare thread (1-14). I guess it has a thread cut for either and your antenna it 1-14 only. A 3/4-BSPT might fit but a marine mount might be best. I whish I still had access to the CNC lathe at my last employers. It would only take a few minutes to knock some up from 30mm hex bar! --- On Tue, 7/7/09, David C. Partridge david.partri...@dsl.pipex.com wrote: From: David C. Partridge david.partri...@dsl.pipex.com Subject: Re: [time-nuts] 1 14 tpi UNS die To: 'Discussion of precise time and frequency measurement' time-nuts@febo.com Date: Tuesday, 7 July, 2009, 7:10 PM As it would appear to an expensive option to purchase the appropriate dies over here, and as the pipe is soft alloy, I've just reduced its diameter a bit so it's an tight push fit in the antenna base (for now) - though still hoping to find a good solution with spending lots of dosh! Thanks to all Dave -Original Message- From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On Behalf Of gandal...@aol.com Sent: 07 July 2009 18:54 To: time-nuts@febo.com Subject: Re: [time-nuts] 1 14 tpi UNS die In a message dated 07/07/2009 18:43:55 GMT Daylight Time, arnold.ti...@gmx.de writes: I have the same problem with several GPS antennas, a Quadrifilar from Raytheon, Irvine 2640NW with mounting base, HP 58532A with mounting base, HP 58504Ac. etc. Some complete boxes from HP do contain an adapter. So this thread is definitively a kind of standard. The thread is fully cylindrical, all the plumbers tubes do use conical threads which are not compatible. Very difficult to find proper solution in the metrical Europe. If I would find a source of that HP-adapters I would buy 4 units. I did not check for the correct naming of this thread though. --- As commented previously, this is a common fitting and fairly standard for GPS antennas and some other antenna kit, especially in a marine environment. A variety of adaptors is available from marine suppliers ranging from expensive stainless steel fittings to much cheaper plastic, they are also regularly listed on Ebay. However, there doesn't seem to be anything readilly available which has a collar to sit over a plain pipe, which I suspect might meet David's needs. They are widely available with a flange fitting, for mounting to flat surfaces, or rail fittings to attach to horizontal deck rails, but perhaps a trawl through some of the marine suppliers might throw up something else that could do the job without the need for threading the end of the pipe. regards Nigel GM8PZR ___ 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] 1 14 tpi UNS die
Try Shakespeare 4705 http://shakespeare-marine.com/mountshow.asp?findmount=4705 1 pipe slip-over to 1-14tpi Photo attached Robert G8RPI --- On Tue, 7/7/09, Arnold Tibus arnold.ti...@gmx.de wrote: From: Arnold Tibus arnold.ti...@gmx.de Subject: Re: [time-nuts] 1 14 tpi UNS die To: Discussion of precise time and frequency measurement time-nuts@febo.com Date: Tuesday, 7 July, 2009, 7:10 PM Nigel and the group, this very useful adapter is what is needed and I am looking for as well. regards Arnold On Tue, 7 Jul 2009 13:53:55 EDT, gandal...@aol.com wrote: In a message dated 07/07/2009 18:43:55 GMT Daylight Time, arnold.ti...@gmx.de writes: I have the same problem with several GPS antennas, a Quadrifilar from Raytheon, Irvine 2640NW with mounting base, HP 58532A with mounting base, HP 58504Ac. etc. Some complete boxes from HP do contain an adapter. So this thread is definitively a kind of standard. The thread is fully cylindrical, all the plumbers tubes do use conical threads which are not compatible. Very difficult to find proper solution in the metrical Europe. If I would find a source of that HP-adapters I would buy 4 units. I did not check for the correct naming of this thread though. --- As commented previously, this is a common fitting and fairly standard for GPS antennas and some other antenna kit, especially in a marine environment. A variety of adaptors is available from marine suppliers ranging from expensive stainless steel fittings to much cheaper plastic, they are also regularly listed on Ebay. However, there doesn't seem to be anything readilly available which has a collar to sit over a plain pipe, which I suspect might meet David's needs. They are widely available with a flange fitting, for mounting to flat surfaces, or rail fittings to attach to horizontal deck rails, but perhaps a trawl through some of the marine suppliers might throw up something else that could do the job without the need for threading the end of the pipe. regards Nigel GM8PZR ___ 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. -Inline Attachment Follows- ___ 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. attachment: 4705.jpg___ 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] 1 14 tpi UNS die
In a message dated 07/07/2009 21:14:33 GMT Daylight Time, robert8...@yahoo.co.uk writes: Try Shakespeare 4705 http://shakespeare-marine.com/mountshow.asp?findmount=4705 1 pipe slip-over to 1-14tpi Now that is very nice, and at a nice price too, well worth making the effort to find a pipe to fit the adapter rather than vice versa:-) regards Nigel GM8PZR ___ 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] Trivia
AT 5 MINUTES AND 6 SECONDS AFTER 4 A.M., ON THE 8TH OF JULY, THIS YEAR, THE TIME AND DATE WILL BE: 04:05:06 07-08-09 THIS WILL NOT HAPPEN AGAIN UNTIL THE YEAR 3009!!! -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.
Re: [time-nuts] Trivia
or next month if DD-MM-YY. Or if refreshments are included celebrate both days ... -pete AT 5 MINUTES AND 6 SECONDS AFTER 4 A.M., ON THE 8TH OF JULY, THIS YEAR, THE TIME AND DATE WILL BE: 04:05:06 07-08-09 THIS WILL NOT HAPPEN AGAIN UNTIL THE YEAR 3009!!! -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 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] 1 14 tpi UNS die
It's also on ebay (USA) for less! Searching ebay (UK) category Vehicle Parts Accessories Boats Parts Accessories Accessories for antenna. This brings up various options. Boat people seem to be charged a lot for some basic stuff! Robert G8RPI. --- On Tue, 7/7/09, gandal...@aol.com gandal...@aol.com wrote: From: gandal...@aol.com gandal...@aol.com Subject: Re: [time-nuts] 1 14 tpi UNS die To: time-nuts@febo.com Date: Tuesday, 7 July, 2009, 9:38 PM In a message dated 07/07/2009 21:14:33 GMT Daylight Time, robert8...@yahoo.co.uk writes: Try Shakespeare 4705 http://shakespeare-marine.com/mountshow.asp?findmount=4705 1 pipe slip-over to 1-14tpi Now that is very nice, and at a nice price too, well worth making the effort to find a pipe to fit the adapter rather than vice versa:-) regards Nigel GM8PZR ___ 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] Trivia
Yes! it will, Overhere in Europe just about a month later it will be 04:05:06 07-08-09. Stijn AT 5 MINUTES AND 6 SECONDS AFTER 4 A.M., ON THE 8TH OF JULY, THIS YEAR, THE TIME AND DATE WILL BE: 04:05:06 07-08-09 THIS WILL NOT HAPPEN AGAIN UNTIL THE YEAR 3009!!! -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 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] OT Euro/US plumbing was 14 tpi UNS die
b...@lysator.liu.se wrote: Hi Chuck, Been living in Sweden my whole life. And almost exclusivly in houses heated by circulating hot water through radiators. I have yet to spot an O-ring. Where in Sweden did you see this strange system? Hi Bjorn, In the US, hydronic heat comes in a couple of flavors: The old fashioned cast iron radiators, fin/coil baseboard radiators, radiant baseboard, or steel radiators/towel warmers imported from the Europe. Your description does not enlighten me... there are all sorts of radiators available here. Most of the European systems are geared towards PEX tubing, and compression fittings... and untapered pipe thread with jamb nuts and O-rings. PEX tubing has been certified, but Prisol tubing (ie soft bendable Cu with plastic coating) is much more common here. Cu tube joints are made with nut, support cylinder and a squeeze ring. Runtal, Cordivari, Wirsbro and Wesaunard are examples I have run into. It is actually Wirsbo... ;-) The others are unknown to me. Do you install and repair systems? Or just live with them? I do minor changes to the house system. And I have accumulated more than enough radiator heating seasons to know your two seasons to leak quality must be a US craftmanship problem. -Chuck Harris -- Björn ___ 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] Datum 9390-52054 Date Problem
My units have all begun displaying the wrong date. A Symmetricom Field Sevice Bulletin describes the problem but does not have a solution. Does anyone in this group have the knowledge and experience to assist me in modifying the firmware to correct this problem. These are beautiful little rack mount receivers and I would like to fix them rather than relagate them to the junk pile. It needs the date fixed because I use the IRIG output to record on telemetry tapes. The URL for the Service Bulletin is http://www.symmetricom.com/media/files/support/ttm/fsb/098%2D50620%2D011.pdf I have a large electronic lab and could possibly assist in the investigation/fix. Doug Wilson Redlands, California ___ 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] Datum 9390-52054 Date Problem
Doug Wilson wrote: My units have all begun displaying the wrong date. A Symmetricom Field Sevice Bulletin describes the problem but does not have a solution. Does anyone in this group have the knowledge and experience to assist me in modifying the firmware to correct this problem. These are beautiful little rack mount receivers and I would like to fix them rather than relagate them to the junk pile. It needs the date fixed because I use the IRIG output to record on telemetry tapes. The URL for the Service Bulletin is http://www.symmetricom.com/media/files/support/ttm/fsb/098%2D50620%2D011.pdf I have a large electronic lab and could possibly assist in the investigation/fix. There should be firmware available, as hinted in the Service Bulletin. A few users have already been provided with firmware, but you need to contact Symmetricom. As for the actual fix, it is not that big modification, but that assumes you have the source and means to compile it. Symmetricom has all that. If you go back in time you will find an email-thread on this particular issue. Cheers, Magnus ___ 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] OT Euro/US plumbing was 14 tpi UNS die
Hi Bjorn, Runtal, Cordivari, Wirsbro and Wesaunard are examples I have run into. It is actually Wirsbo... ;-) The others are unknown to me. Do you install and repair systems? Or just live with them? I do minor changes to the house system. And I have accumulated more than enough radiator heating seasons to know your two seasons to leak quality must be a US craftmanship problem. Nope! I'm the US craftsman using European plumbing parts, as instructed by the manufacturers. But I'm puzzled! First you tell me you have never seen an O-ring with a jamb nut in a heating system, and then you tell me that your system, presumably without any such O-ring seals, doesn't leak??? -Chuck Harris ___ 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] Trak 8810 GPS station (Rb GPSDO)
Hello, I'm looking for information about a GPSDO built by Trak Systems sometime around 1990 under the reference 8810 which include a Magnavox MX 4200 GPS unit and an Efratom Rubidium Oscillator FRS-C, 10 MHz, Part no. 814-100-1, S/N 1049, Date code 8649. I found the manual for the Efratom FRS oscillators, even if this part number doesn't fit the part numbering given in the manual. I have more problem with the GPS receiver. Till now I only found the NMEA proprietary sentences descriptions. I'm not sure if it will pass the GPS week rollover (aka y2k bug), since the unit was out broken since a long time. And I found strictly no information on the Trak 8810 itself. Every piece of information will be very welcome! Thanks in advance, Jean-Louis Oneto Grasse - France e-mail: jean-louis.on...@obs-azur.fr ___ 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] Datum 9390-52054 Manual Needed (PDF)
Some time ago someone indicated that they had the manual in a file for this unit (Datum 9390-52054). If it is still around could you please email it to me (3MB) file size is O.K. Doug Wilson (dwil...@linkline.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.
Re: [time-nuts] Trivia
And if paying with timezones that can even be at least 48 celebrations... I'm not sure I will still be able to count the seconds after that! Jean-Louis Oneto - Original Message - From: Pete Lancashire p...@petelancashire.com To: j...@quik.com; Discussion of precise time and frequency measurement time-nuts@febo.com Sent: Tuesday, July 07, 2009 9:05 PM Subject: Re: [time-nuts] Trivia or next month if DD-MM-YY. Or if refreshments are included celebrate both days ... -pete AT 5 MINUTES AND 6 SECONDS AFTER 4 A.M., ON THE 8TH OF JULY, THIS YEAR, THE TIME AND DATE WILL BE: 04:05:06 07-08-09 THIS WILL NOT HAPPEN AGAIN UNTIL THE YEAR 3009!!! -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 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] OT Euro/US plumbing was 14 tpi UNS die
I agree with you, but would note that iron NPT threaded joints that leak a bit, will often self seal due to rust, given time. -John = The relevant US pipe-thread standards are quite clear - straight threads are for mechanical connections only. For connections that must also contain fluids under pressure, one uses taper threads such as the ubiquitous NPT. Over the decades, I have lived in many houses, including my current house, with circulating hot water heat and cast iron radiators, and I have never had to redo a radiator connection. I've never had a leak, and most of these systems were old when I bought the house. If you have straight pipe threads going into radiators, there is an installer who should be made to re-do the job. Maybe he was an out-of-work electrician, and used rigid electrical conduit for pipe. Straight threads and O rings are seen only in hydraulic systems, not domestic water or heating systems, and the mating parts have correctly designed pockets to hold the O-rings. And they do not use jam nuts. One screws them together until they bottom. Joe Gwinn ___ 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] Trivia
Yeh, and for some reason they drive on the wrong side of the road as well :) 73, Steve 2009/7/8 Jim Palfreyman jim77...@gmail.com: 7th of August is the date to celebrate in Australia too. In fact I think that weird MM-DD-YY format is peculiar to only the US isn't it? Jim 2009/7/8 Magnus Danielson mag...@rubidium.dyndns.org S. Nestra wrote: Yes! it will, Overhere in Europe just about a month later it will be 04:05:06 07-08-09. I'll wait to 2009-08-07T06:05:04.03Z. Cheers, Magnus Stijn AT 5 MINUTES AND 6 SECONDS AFTER 4 A.M., ON THE 8TH OF JULY, THIS YEAR, THE TIME AND DATE WILL BE: 04:05:06 07-08-09 THIS WILL NOT HAPPEN AGAIN UNTIL THE YEAR 3009!!! -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 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. -- Steve Rooke - ZL3TUV G8KVD JAKDTTNW A man with one clock knows what time it is; A man with two clocks is never quite sure. ___ 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] OT Euro/US plumbing was 14 tpi UNS die
Joseph M Gwinn wrote: The relevant US pipe-thread standards are quite clear - straight threads are for mechanical connections only. For connections that must also contain fluids under pressure, one uses taper threads such as the ubiquitous NPT. Over the decades, I have lived in many houses, including my current house, with circulating hot water heat and cast iron radiators, and I have never had to redo a radiator connection. I've never had a leak, and most of these systems were old when I bought the house. If you have straight pipe threads going into radiators, there is an installer who should be made to re-do the job. Maybe he was an out-of-work electrician, and used rigid electrical conduit for pipe. Sorry, but the European radiators, manifolds, fittings and valves that are coming into the US for use in hydronic heating systems are all straight pipe thread with O-rings and jamb nuts, and that is the reason for my mentioning of that fact. They are exactly as I described them. Straight threads and O rings are seen only in hydraulic systems, not domestic water or heating systems, and the mating parts have correctly designed pockets to hold the O-rings. And they do not use jam nuts. One screws them together until they bottom. I understand that, tell that to the European heating manufacturers. Time to get back to time. -Chuck Harris ___ 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.
