Re: [time-nuts] Antenna for t-bolt
On 04/07/2012 01:30 PM, Tom Van Baak wrote: It might be a stupid question, but what is the spike at the top for? It's just plastic; not for lightning. For me it keeps birds from sitting on the top of the radome and dropping liquid gps signal attenuators. This is actually an improvement over round radomes as they are large nice landingspots for avian carriers on route to deliver IP packets. Still needs to get my chokerings up on the roof. 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] Antenna for t-bolt
Chuck, I usually see GPS antennae flashed by lightning: have succedeed opening and repairing a couple of them but at times they are too bad to do anything. I use a network analyzer to test them after repairing here at work. On Tue, Apr 3, 2012 at 8:24 AM, gary li...@lazygranch.com wrote: Going back to software filtering brings us full circle. ;-) Searching the interwebs, I found this: http://www.ll.mit.edu/mission/**aviation/publications/** publication-files/atc-reports/**Dinius_1995_ATC-238_WW-15318.**pdfhttp://www.ll.mit.edu/mission/aviation/publications/publication-files/atc-reports/Dinius_1995_ATC-238_WW-15318.pdf They more or less state the obvious, but do provide some test results. Now the obvious is you want good cross polarization, i.e. the ability to reject the wrong polarization. Basically the intended signal is RHP, but the direct bounce is LHP, so you want the antenna to have good RHP gain and poor LHP gain, or more accurately, the ratio between the two. The next source of interference is the bounce from the ground, which could be multiple hops and thus potentially RHP. That is where a ground plane or choke ring came in handy. Page 37 has the conclusions. I have a similar Trimble patch somewhere (Trimble 16248-50). It has never seen action (at least by me) since the voltage requirement is quite odd. I don't have it in front of me, but I think 4.5v. That particular antenna also has a SAW filter in it. It is a Navy item. On 4/2/2012 10:15 PM, Hal Murray wrote: c...@omen.com said: Presumably a timing antenna would block low elevation signals to reduce multipath. Maybe, but there is a software aspect to the filter. You get to select the elevation angle. I don't remember seeing any specs about the filtering angles of various antennas. Has anybody seen something like that? __**_ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/** mailman/listinfo/time-nutshttps://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] Antenna for T-bolt
On Mon, 02 Apr 2012 15:28:40 -0700, Bob Martin wrote: Bill-- The Thunderbolt wants a higher gain antenna than most standard GPS receivers. I tried standard Garmin active antennas, and while they worked (I have a good view of the sky), signal levels could be better. Best match probably is something like the HP/Symmetricom 58532A antenna, which has gain 30dB -- most active GPS antennas are in the 24 - 26 dB range. They're not cheap, but they'll do the job. If you have much distance to cover, feed line is of course important as well -- 9913, LMR 400, good quality RG6, something with low loss at 1.5 GHz. I'm using a 58532A feeding a Symmetricom 58535A active GPS splitter to run a Thunderbolt and a Datum Tymserve 2100. Feedline is 9913 to the splitter, and short LMR 195 SMA cables from there. (Yes you can find F to SMA adapters, on eBay, even though many will shudder at the concept...) 73 Bob K6RTM On Apr 2, 2012, at 15:01, time-nuts-requ...@febo.com wrote: -- Message: 4 Date: Mon, 2 Apr 2012 17:39:40 -0400 From: Bill Riches bill.ric...@verizon.net To: 'Discussion of precise time and frequency measurement' time-nuts@febo.com Subject: [time-nuts] Antenna for t-bolt Message-ID: 01ac01cd1119$1c699af0$553cd0d0$@riches-H +0wwilmms3r7s880jo...@public.gmane.org Content-Type: text/plain;charset=US-ASCII Hi guys, I have asked this question several times over the past few weeks and get no answer. Have I been ostracized??!! Question is that I am looking for suggestions for GPS antenna for t-bolt. The antenna that I am using now is a no name and I not know where it came from! Wonder if a Garman GA-30 will work? I think any 5v antenna with a 25+ dB gain would work. But the Tbolt likes a high gain antenna. I'm using Maxrad GPS-TMG-40 (40dB) with N-Conn , in Copenhagen. It works reasonably fine with 25m quality 75ohm cable. It's on the balcony , with an ok view to the south. But absolutely no view north , so a bit of the time only 2 sats active. LH says adev 1.2x e-12 on PPS adev 5.3x e-13 on OSC In my summerhouse i use the mushroom like antenna that came with the kit from fluke.l , but i have an extra Maxrad waiting to be mounted. This might be a good choice eby item : 320881667391. Just key in the # in search This is the symetricom as item : 300571554900 cfo ___ 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] Antenna for T-bolt
The Symmetricom item 300571554900 you listed below includes a GPS. It is not just an antenna. Rob Kimberley -Original Message- From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On Behalf Of cfo Sent: 03 April 2012 15:31 To: time-nuts@febo.com Subject: Re: [time-nuts] Antenna for T-bolt On Mon, 02 Apr 2012 15:28:40 -0700, Bob Martin wrote: Bill-- The Thunderbolt wants a higher gain antenna than most standard GPS receivers. I tried standard Garmin active antennas, and while they worked (I have a good view of the sky), signal levels could be better. Best match probably is something like the HP/Symmetricom 58532A antenna, which has gain 30dB -- most active GPS antennas are in the 24 - 26 dB range. They're not cheap, but they'll do the job. If you have much distance to cover, feed line is of course important as well -- 9913, LMR 400, good quality RG6, something with low loss at 1.5 GHz. I'm using a 58532A feeding a Symmetricom 58535A active GPS splitter to run a Thunderbolt and a Datum Tymserve 2100. Feedline is 9913 to the splitter, and short LMR 195 SMA cables from there. (Yes you can find F to SMA adapters, on eBay, even though many will shudder at the concept...) 73 Bob K6RTM On Apr 2, 2012, at 15:01, time-nuts-requ...@febo.com wrote: -- Message: 4 Date: Mon, 2 Apr 2012 17:39:40 -0400 From: Bill Riches bill.ric...@verizon.net To: 'Discussion of precise time and frequency measurement' time-nuts@febo.com Subject: [time-nuts] Antenna for t-bolt Message-ID: 01ac01cd1119$1c699af0$553cd0d0$@riches-H +0wwilmms3r7s880jo...@public.gmane.org Content-Type: text/plain;charset=US-ASCII Hi guys, I have asked this question several times over the past few weeks and get no answer. Have I been ostracized??!! Question is that I am looking for suggestions for GPS antenna for t-bolt. The antenna that I am using now is a no name and I not know where it came from! Wonder if a Garman GA-30 will work? I think any 5v antenna with a 25+ dB gain would work. But the Tbolt likes a high gain antenna. I'm using Maxrad GPS-TMG-40 (40dB) with N-Conn , in Copenhagen. It works reasonably fine with 25m quality 75ohm cable. It's on the balcony , with an ok view to the south. But absolutely no view north , so a bit of the time only 2 sats active. LH says adev 1.2x e-12 on PPS adev 5.3x e-13 on OSC In my summerhouse i use the mushroom like antenna that came with the kit from fluke.l , but i have an extra Maxrad waiting to be mounted. This might be a good choice eby item : 320881667391. Just key in the # in search This is the symetricom as item : 300571554900 cfo ___ 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] Antenna for T-bolt
On Tue, 03 Apr 2012 15:40:05 +0100, Rob Kimberley wrote: The Symmetricom item 300571554900 you listed below includes a GPS. It is not just an antenna. Rob Kimberley Oopzz , good catch (sorry) 280847506469 (us) 320878139168 (cn) Might be better cfo ___ 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] Antenna for T-bolt
They look OK. :-) -Original Message- From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On Behalf Of cfo Sent: 03 April 2012 15:51 To: time-nuts@febo.com Subject: Re: [time-nuts] Antenna for T-bolt On Tue, 03 Apr 2012 15:40:05 +0100, Rob Kimberley wrote: The Symmetricom item 300571554900 you listed below includes a GPS. It is not just an antenna. Rob Kimberley Oopzz , good catch (sorry) 280847506469 (us) 320878139168 (cn) Might be better cfo ___ 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] Antenna for t-bolt
Hi Chuck, Mine is not dead, just hard of hearing... Once I realized that, I set it aside and I have not used it in years. I got it with a red box Thunderbolt I bought from a lit member a long time ago. It has some obvious signs of experience being outside. It is possible that moisture got inside. Maybe I should try to take it apart? Not sure how to open it without breaking the radome. Did you get yours open? On the other hand, the Symetricom 58532A I got on eBay for $50 was brand new, in original box with original paperwork. It seems like those on eBay now are not new or a lot more expensive. Didier KO4BB Sent from my BlackBerry Wireless thingy while I do other things... -Original Message- From: Chuck Harris cfhar...@erols.com Sender: time-nuts-boun...@febo.com Date: Tue, 03 Apr 2012 00:11:31 To: Discussion of precise time and frequency measurementtime-nuts@febo.com Reply-To: Discussion of precise time and frequency measurement time-nuts@febo.com Subject: Re: [time-nuts] Antenna for t-bolt Hi Didier, I have one of the Trimble Bullet antennas, that was supposed to be from a working system, but it is deaf as a post... really dead. Given that it is supposed to be more than 30db gain, it should do better than any of the hockey puck antennas. I wonder if there is a common failure mode in that antenna? -Chuck Harris Didier Juges wrote: I have a Symetricom 58532A which I bought on eBay for $50 with shipping. That is probably the best antenna you can get, and it won't break the bank. I also have a Trimble Bullet, the antenna that was designed to go with the Tunderbolt. It is a very good antenna also, but harder to find, and it has lower gain than the 58532A, so at my location (under the roof in Florida), at the end of 50 feet of good quality 75 ohm coax, the Symetricom unit works better. I also have several pucks, including very inexpensive Chinese-made ones and a very nice Trimble mag-mount puck that is the best of all the pucks I have (in terms of performance and also mechanical design) and which I got for $15 on eBay also. They all work, but the Trimble puck is the one I take if I need to go mobile. Most the pucks I have receive better than the Trimble Bullet. They are probably not as good as far as multipath rejection for low angle signals, but they are more sensitive and I see more satellites with them. Didier KO4BB On Mon, Apr 2, 2012 at 4:39 PM, Bill Richesbill.ric...@verizon.net wrote: Hi guys, I have asked this question several times over the past few weeks and get no answer. Have I been ostracized??!! Question is that I am looking for suggestions for GPS antenna for t-bolt. The antenna that I am using now is a no name and I not know where it came from! Wonder if a Garman GA-30 will work? 73, Bill, WA2DVU Cape May, NJ ___ 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] Antenna for t-bolt
The elevation angle filter is based on the satellite position, not the actual direction the signals come from. If you have reflections and multipath, but the satellite is otherwise high in the sky, you are out of luck regardless of elevation angle filter. Of course, the higher the sat, the less likely you will have reflections from roofs and such, so it is definitely not useless, but it is not the same as having a good antenna in the first place. Didier KO4BB --Original Message-- From: Hal Murray Sender: time-nuts-boun...@febo.com To: Time-Nuts ReplyTo: Time-Nuts Subject: Re: [time-nuts] Antenna for t-bolt Sent: Apr 3, 2012 12:15 AM c...@omen.com said: Presumably a timing antenna would block low elevation signals to reduce multipath. Maybe, but there is a software aspect to the filter. You get to select the elevation angle. I don't remember seeing any specs about the filtering angles of various antennas. Has anybody seen something like that? -- 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. Sent from my BlackBerry Wireless thingy while I do other things... ___ 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] Antenna for t-bolt
Of course the elevation mask is only software and doesn't prevent the bad signal from entering the antenna but then the signal will not despread and should cause no harm to the computations. On Tue, Apr 3, 2012 at 9:19 PM, shali...@gmail.com wrote: The elevation angle filter is based on the satellite position, not the actual direction the signals come from. If you have reflections and multipath, but the satellite is otherwise high in the sky, you are out of luck regardless of elevation angle filter. Of course, the higher the sat, the less likely you will have reflections from roofs and such, so it is definitely not useless, but it is not the same as having a good antenna in the first place. Didier KO4BB --Original Message-- From: Hal Murray Sender: time-nuts-boun...@febo.com To: Time-Nuts ReplyTo: Time-Nuts Subject: Re: [time-nuts] Antenna for t-bolt Sent: Apr 3, 2012 12:15 AM c...@omen.com said: Presumably a timing antenna would block low elevation signals to reduce multipath. Maybe, but there is a software aspect to the filter. You get to select the elevation angle. I don't remember seeing any specs about the filtering angles of various antennas. Has anybody seen something like that? -- 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. Sent from my BlackBerry Wireless thingy while I do other things... ___ 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] Antenna for t-bolt
If the satellite is above the mask, the signal will be used in computing a solution even if it got in through reflexions and multipath. That's why a good antenna with choke rings is desirable. Didier KO4BB Sent from my BlackBerry Wireless thingy while I do other things... -Original Message- From: Azelio Boriani azelio.bori...@screen.it Sender: time-nuts-boun...@febo.com Date: Tue, 3 Apr 2012 21:27:26 To: Discussion of precise time and frequency measurementtime-nuts@febo.com Reply-To: Discussion of precise time and frequency measurement time-nuts@febo.com Subject: Re: [time-nuts] Antenna for t-bolt Of course the elevation mask is only software and doesn't prevent the bad signal from entering the antenna but then the signal will not despread and should cause no harm to the computations. On Tue, Apr 3, 2012 at 9:19 PM, shali...@gmail.com wrote: The elevation angle filter is based on the satellite position, not the actual direction the signals come from. If you have reflections and multipath, but the satellite is otherwise high in the sky, you are out of luck regardless of elevation angle filter. Of course, the higher the sat, the less likely you will have reflections from roofs and such, so it is definitely not useless, but it is not the same as having a good antenna in the first place. Didier KO4BB --Original Message-- From: Hal Murray Sender: time-nuts-boun...@febo.com To: Time-Nuts ReplyTo: Time-Nuts Subject: Re: [time-nuts] Antenna for t-bolt Sent: Apr 3, 2012 12:15 AM c...@omen.com said: Presumably a timing antenna would block low elevation signals to reduce multipath. Maybe, but there is a software aspect to the filter. You get to select the elevation angle. I don't remember seeing any specs about the filtering angles of various antennas. Has anybody seen something like that? -- 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. Sent from my BlackBerry Wireless thingy while I do other things... ___ 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] Antenna for t-bolt
Absolutely true, that's why it is advisable to dare with the elevation mask and set it rather high (upto 20 deg?) if the antenna is clear above but there is the possibility for multipath or reflections (i.e. surrounded by buildings). Of course the choke rings antenna is better... guess how much the Trimble Zephyr gained starting at $250? It's gone for $1050: we can say that 10 degrees more of elevation mask are worth $800. Anyway, the Zephyr antenna doesn't have rings but there should be a sort of absorbing plane made by those expensive microwave absorbing sheets. On Tue, Apr 3, 2012 at 9:38 PM, shali...@gmail.com wrote: If the satellite is above the mask, the signal will be used in computing a solution even if it got in through reflexions and multipath. That's why a good antenna with choke rings is desirable. Didier KO4BB Sent from my BlackBerry Wireless thingy while I do other things... -Original Message- From: Azelio Boriani azelio.bori...@screen.it Sender: time-nuts-boun...@febo.com Date: Tue, 3 Apr 2012 21:27:26 To: Discussion of precise time and frequency measurement time-nuts@febo.com Reply-To: Discussion of precise time and frequency measurement time-nuts@febo.com Subject: Re: [time-nuts] Antenna for t-bolt Of course the elevation mask is only software and doesn't prevent the bad signal from entering the antenna but then the signal will not despread and should cause no harm to the computations. On Tue, Apr 3, 2012 at 9:19 PM, shali...@gmail.com wrote: The elevation angle filter is based on the satellite position, not the actual direction the signals come from. If you have reflections and multipath, but the satellite is otherwise high in the sky, you are out of luck regardless of elevation angle filter. Of course, the higher the sat, the less likely you will have reflections from roofs and such, so it is definitely not useless, but it is not the same as having a good antenna in the first place. Didier KO4BB --Original Message-- From: Hal Murray Sender: time-nuts-boun...@febo.com To: Time-Nuts ReplyTo: Time-Nuts Subject: Re: [time-nuts] Antenna for t-bolt Sent: Apr 3, 2012 12:15 AM c...@omen.com said: Presumably a timing antenna would block low elevation signals to reduce multipath. Maybe, but there is a software aspect to the filter. You get to select the elevation angle. I don't remember seeing any specs about the filtering angles of various antennas. Has anybody seen something like that? -- 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. Sent from my BlackBerry Wireless thingy while I do other things... ___ 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] Antenna for t-bolt
Typical chokerings are L1/L2 geodetic antennas. There is however simple L1-only chokerings available from time to time on *bay. I have often seen them as low as in the $50 range. Orginal use I think was for DGPS reference stations. Most seem to be the Aeroantenna model in the url below. http://www.aeroantenna.com/PDF/AT575-90_G.pdf However they have usually been rebadged by Novatel, CMC or Leica. -- Björn If the satellite is above the mask, the signal will be used in computing a solution even if it got in through reflexions and multipath. That's why a good antenna with choke rings is desirable. Didier KO4BB ___ 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] Antenna for t-bolt
Yes, there was an antenna with the sting months ago, now that I see your PDF I remember but can't remember the price and the brand. On Tue, Apr 3, 2012 at 10:05 PM, b...@lysator.liu.se wrote: Typical chokerings are L1/L2 geodetic antennas. There is however simple L1-only chokerings available from time to time on *bay. I have often seen them as low as in the $50 range. Orginal use I think was for DGPS reference stations. Most seem to be the Aeroantenna model in the url below. http://www.aeroantenna.com/PDF/AT575-90_G.pdf However they have usually been rebadged by Novatel, CMC or Leica. -- Björn If the satellite is above the mask, the signal will be used in computing a solution even if it got in through reflexions and multipath. That's why a good antenna with choke rings is desirable. Didier KO4BB ___ 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] Antenna for t-bolt
shali...@gmail.com said: I got it with a red box Thunderbolt I bought from a lit member a long time ago. It has some obvious signs of experience being outside. It is possible that moisture got inside. Maybe I should try to take it apart? Not sure how to open it without breaking the radome. Did you get yours open? I'm not sure what sort of antenna you are talking about. I got one open the easy way. I just removed the screws and pulled the top off. There was an o-ring that made a very good fit. http://www.megapathdsl.net/~hmurray/time-nuts/Lucent-Antenna.jpg It took me two tries. The first time I didn't pull hard enough, but then somebody reported that theirs came apart without any dynamite so I tried again and it worked. That was all part of an antenna discussion back in Aug 2009 http://www.mail-archive.com/time-nuts@febo.com/msg21726.html -- 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.
[time-nuts] Antenna for t-bolt
Hi guys, I have asked this question several times over the past few weeks and get no answer. Have I been ostracized??!! Question is that I am looking for suggestions for GPS antenna for t-bolt. The antenna that I am using now is a no name and I not know where it came from! Wonder if a Garman GA-30 will work? 73, Bill, WA2DVU Cape May, NJ ___ 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] Antenna for t-bolt
I found these at a local surplus shop. $15 each. It worked on the Starloc. I got the 240 version which has high gain. The Starloc is a bit deaf. So to pick an antenna for the Tbolt, it should meet gain requirements and voltage. Marine grade is kind of overkill. Potentially the marine grade gear is not as good as the dedicated timing GPS antennas since those (I believe) are designed not to view the horizon as well as a standard GPS antenna. http://www.hankookantennausa.com/products/gps/gps_019.htm ___ 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] Antenna for T-bolt
The booster amps used for satellite dishes work on GPS as well. I used one when I was feeding two Thunderbolts thru a splitter. On 04/02/2012 03:28 PM, Bob Martin wrote: Bill-- The Thunderbolt wants a higher gain antenna than most standard GPS receivers. I tried standard Garmin active antennas, and while they worked (I have a good view of the sky), signal levels could be better. Best match probably is something like the HP/Symmetricom 58532A antenna, which has gain 30dB -- most active GPS antennas are in the 24 - 26 dB range. They're not cheap, but they'll do the job. If you have much distance to cover, feed line is of course important as well -- 9913, LMR 400, good quality RG6, something with low loss at 1.5 GHz. I'm using a 58532A feeding a Symmetricom 58535A active GPS splitter to run a Thunderbolt and a Datum Tymserve 2100. Feedline is 9913 to the splitter, and short LMR 195 SMA cables from there. (Yes you can find F to SMA adapters, on eBay, even though many will shudder at the concept...) 73 Bob K6RTM On Apr 2, 2012, at 15:01, time-nuts-requ...@febo.com wrote: -- Message: 4 Date: Mon, 2 Apr 2012 17:39:40 -0400 From: Bill Richesbill.ric...@verizon.net To: 'Discussion of precise time and frequency measurement' time-nuts@febo.com Subject: [time-nuts] Antenna for t-bolt Message-ID:01ac01cd1119$1c699af0$553cd0d0$@ric...@verizon.net Content-Type: text/plain; charset=US-ASCII Hi guys, I have asked this question several times over the past few weeks and get no answer. Have I been ostracized??!! Question is that I am looking for suggestions for GPS antenna for t-bolt. The antenna that I am using now is a no name and I not know where it came from! Wonder if a Garman GA-30 will work? 73, Bill, WA2DVU Cape May, NJ ___ 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. -- Chuck Forsberg WA7KGX N2469R c...@omen.com www.omen.com Developer of Industrial ZMODEM(Tm) for Embedded Applications Omen Technology Inc The High Reliability Software 10255 NW Old Cornelius Pass Portland OR 97231 503-614-0430 ___ 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] Antenna for T-bolt
Here is the antenna I purchased from Ebay (China). This is a Lucent 40dB timing antenna that should work for any GPS receiver. Mine took about 2 weeks to get here and there were no problems getting it. This unit is currently available for 'buy it now at $28 dollars. http://www.ebay.com/itm/lucent-GPS-Timing-Reference-Antenna-antenne-40db-N-/230771298518?pt=LH_DefaultDomain_0hash=item35bb0a90d6 Jerry Mulchin At 03:28 PM 4/2/2012, you wrote: Bill-- The Thunderbolt wants a higher gain antenna than most standard GPS receivers. I tried standard Garmin active antennas, and while they worked (I have a good view of the sky), signal levels could be better. Best match probably is something like the HP/Symmetricom 58532A antenna, which has gain 30dB -- most active GPS antennas are in the 24 - 26 dB range. They're not cheap, but they'll do the job. If you have much distance to cover, feed line is of course important as well -- 9913, LMR 400, good quality RG6, something with low loss at 1.5 GHz. I'm using a 58532A feeding a Symmetricom 58535A active GPS splitter to run a Thunderbolt and a Datum Tymserve 2100. Feedline is 9913 to the splitter, and short LMR 195 SMA cables from there. (Yes you can find F to SMA adapters, on eBay, even though many will shudder at the concept...) 73 Bob K6RTM On Apr 2, 2012, at 15:01, time-nuts-requ...@febo.com wrote: -- Message: 4 Date: Mon, 2 Apr 2012 17:39:40 -0400 From: Bill Riches bill.ric...@verizon.net To: 'Discussion of precise time and frequency measurement' time-nuts@febo.com Subject: [time-nuts] Antenna for t-bolt Message-ID: 01ac01cd1119$1c699af0$553cd0d0$@ric...@verizon.net Content-Type: text/plain; charset=US-ASCII Hi guys, I have asked this question several times over the past few weeks and get no answer. Have I been ostracized??!! Question is that I am looking for suggestions for GPS antenna for t-bolt. The antenna that I am using now is a no name and I not know where it came from! Wonder if a Garman GA-30 will work? 73, Bill, WA2DVU Cape May, NJ ___ 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. Jerry Mulchin ___ 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] Antenna for T-bolt
On Mon, Apr 2, 2012 at 3:28 PM, Bob Martin k6...@comcast.net wrote: Bill-- The Thunderbolt wants a higher gain antenna than most standard GPS receivers. I tried standard Garmin active antennas, and while they worked (I have a good view of the sky), signal levels could be better. Best match probably is something like the HP/Symmetricom 58532A antenna, which has gain 30dB -- most active GPS antennas are in the 24 - 26 dB range. I have a 26dB timing antenna the kind that is easy to find on eBay. It works well with my T-bolt. I have the antenna on a short mast made of galvanized iron plumbing pipe with the feed line coming down the center of the iron pipe. Yes it is true the t-bolt can use more gain but it is not so clear I'd get better timing. I can lock satellites from horizon to horizon. I think what IS clear is that location maters MUCH more than any other factor. First you need to find a way for the antenna to get a full 360 degree view of the sky down to the horizon, all the way around. This may mean you have to move the t-bolt too. By that I mean, rather then saying you can't run antenna feed down from the roof, place the t-bolt new the roof then use cat-5 wire ro whatever to bring the 10MHZ and PPS and Serial data down. Details are site dependent but getting the antenna to a good location should drive all yu other trade offs. Lastly you can replace the antenna with a real timing antenna. I had a patch type mag mount on the roof, it worked but the pointed radome but keeps birds off and if it snowed here would keep that off too. Chris Albertson Redondo Beach, 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] Antenna for T-bolt
All gone .. I got one. I'm happy for $26 but the thing was pretty badly treated in its life and the seal did not look well. If yours is as knocked around I'd suggest pulling it apart and use a bit of sealer (RTV etc) Now to come up with a mount, they are more rare and usually go for more then the antennas -pete On Mon, Apr 2, 2012 at 4:00 PM, Jerry Mulchin jmulc...@cox.net wrote: Here is the antenna I purchased from Ebay (China). This is a Lucent 40dB timing antenna that should work for any GPS receiver. Mine took about 2 weeks to get here and there were no problems getting it. This unit is currently available for 'buy it now at $28 dollars. http://www.ebay.com/itm/lucent-GPS-Timing-Reference-Antenna-antenne-40db-N-/230771298518?pt=LH_DefaultDomain_0hash=item35bb0a90d6 Jerry Mulchin At 03:28 PM 4/2/2012, you wrote: Bill-- The Thunderbolt wants a higher gain antenna than most standard GPS receivers. I tried standard Garmin active antennas, and while they worked (I have a good view of the sky), signal levels could be better. Best match probably is something like the HP/Symmetricom 58532A antenna, which has gain 30dB -- most active GPS antennas are in the 24 - 26 dB range. They're not cheap, but they'll do the job. If you have much distance to cover, feed line is of course important as well -- 9913, LMR 400, good quality RG6, something with low loss at 1.5 GHz. I'm using a 58532A feeding a Symmetricom 58535A active GPS splitter to run a Thunderbolt and a Datum Tymserve 2100. Feedline is 9913 to the splitter, and short LMR 195 SMA cables from there. (Yes you can find F to SMA adapters, on eBay, even though many will shudder at the concept...) 73 Bob K6RTM On Apr 2, 2012, at 15:01, time-nuts-requ...@febo.com wrote: -- Message: 4 Date: Mon, 2 Apr 2012 17:39:40 -0400 From: Bill Riches bill.ric...@verizon.net To: 'Discussion of precise time and frequency measurement' time-nuts@febo.com Subject: [time-nuts] Antenna for t-bolt Message-ID: 01ac01cd1119$1c699af0$553cd0d0$@ric...@verizon.net Content-Type: text/plain; charset=US-ASCII Hi guys, I have asked this question several times over the past few weeks and get no answer. Have I been ostracized??!! Question is that I am looking for suggestions for GPS antenna for t-bolt. The antenna that I am using now is a no name and I not know where it came from! Wonder if a Garman GA-30 will work? 73, Bill, WA2DVU Cape May, NJ ___ 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. Jerry Mulchin ___ 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] Antenna for T-bolt
On Mon, Apr 2, 2012 at 4:00 PM, Jerry Mulchin jmulc...@cox.net wrote: Here is the antenna I purchased from Ebay (China). This is a Lucent 40dB timing antenna that should work for any GPS receiver. Mine took about 2 weeks to get here and there were no problems getting it. This unit is currently available for 'buy it now at $28 dollars. Yours is technically better. But mine is eBay #270881742870 and works perfectly. I'm using about 25 feet of rg58 cable and might swap it out for rg8 just because I have a bunch of it. I keep the t-bolt on a shelf in a second floor walk-in closet that has no exterior walls and no forced air heater vent so it stays very stabile temperature. The attic got to hot and to cold, other places had heating vents and would cycle. Chris Albertson Redondo Beach, 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] Antenna for T-bolt
There are still some listed at GBP 19.00. Search for lucent 40db. Orin. On Mon, Apr 2, 2012 at 4:14 PM, Pete Lancashire p...@petelancashire.comwrote: All gone .. I got one. I'm happy for $26 but the thing was pretty badly treated in its life and the seal did not look well. If yours is as knocked around I'd suggest pulling it apart and use a bit of sealer (RTV etc) ___ 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] Antenna for T-bolt
There's a lot of five Racal survey antennae on eBay, lot 370600485855 which have been round at least once before. I use one of these with a T'bolt and it performs extremely well; I'm not sure what one would do with the other four however... 5 Volt operation, TNC connector, c. 30 dB gain. Dan ___ 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] Antenna for t-bolt
I have a Symetricom 58532A which I bought on eBay for $50 with shipping. That is probably the best antenna you can get, and it won't break the bank. I also have a Trimble Bullet, the antenna that was designed to go with the Tunderbolt. It is a very good antenna also, but harder to find, and it has lower gain than the 58532A, so at my location (under the roof in Florida), at the end of 50 feet of good quality 75 ohm coax, the Symetricom unit works better. I also have several pucks, including very inexpensive Chinese-made ones and a very nice Trimble mag-mount puck that is the best of all the pucks I have (in terms of performance and also mechanical design) and which I got for $15 on eBay also. They all work, but the Trimble puck is the one I take if I need to go mobile. Most the pucks I have receive better than the Trimble Bullet. They are probably not as good as far as multipath rejection for low angle signals, but they are more sensitive and I see more satellites with them. Didier KO4BB On Mon, Apr 2, 2012 at 4:39 PM, Bill Riches bill.ric...@verizon.net wrote: Hi guys, I have asked this question several times over the past few weeks and get no answer. Have I been ostracized??!! Question is that I am looking for suggestions for GPS antenna for t-bolt. The antenna that I am using now is a no name and I not know where it came from! Wonder if a Garman GA-30 will work? 73, Bill, WA2DVU Cape May, NJ ___ 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] Antenna for t-bolt
On 4/2/2012 5:39 PM, Bill Riches wrote: Question is that I am looking for suggestions for GPS antenna for t-bolt. I use an Andrew GPS-QBW-26N (quadrifilar). 26 db amp + 4 db antenna gain, through an HP 58516 distribution amp. Works well for me. ___ 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] Antenna for t-bolt
Hi Didier, I have one of the Trimble Bullet antennas, that was supposed to be from a working system, but it is deaf as a post... really dead. Given that it is supposed to be more than 30db gain, it should do better than any of the hockey puck antennas. I wonder if there is a common failure mode in that antenna? -Chuck Harris Didier Juges wrote: I have a Symetricom 58532A which I bought on eBay for $50 with shipping. That is probably the best antenna you can get, and it won't break the bank. I also have a Trimble Bullet, the antenna that was designed to go with the Tunderbolt. It is a very good antenna also, but harder to find, and it has lower gain than the 58532A, so at my location (under the roof in Florida), at the end of 50 feet of good quality 75 ohm coax, the Symetricom unit works better. I also have several pucks, including very inexpensive Chinese-made ones and a very nice Trimble mag-mount puck that is the best of all the pucks I have (in terms of performance and also mechanical design) and which I got for $15 on eBay also. They all work, but the Trimble puck is the one I take if I need to go mobile. Most the pucks I have receive better than the Trimble Bullet. They are probably not as good as far as multipath rejection for low angle signals, but they are more sensitive and I see more satellites with them. Didier KO4BB On Mon, Apr 2, 2012 at 4:39 PM, Bill Richesbill.ric...@verizon.net wrote: Hi guys, I have asked this question several times over the past few weeks and get no answer. Have I been ostracized??!! Question is that I am looking for suggestions for GPS antenna for t-bolt. The antenna that I am using now is a no name and I not know where it came from! Wonder if a Garman GA-30 will work? 73, Bill, WA2DVU Cape May, NJ ___ 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] Antenna for t-bolt
Here is a picture of the guts of the antenna that was made for the Thunderbolt. They don't appear to have gone to much effort to have a high horizon. -Chuck Harris Chuck Forsberg WA7KGX N2469R wrote: I got a mushroom shaped antenna along with my Thunderbolt. It came with some rg58 terminated in an F connector. I don't know if it is a timing reference antenna or just a plain GPS antenna. Presumably a timing antenna would block low elevation signals to reduce multipath. attachment: Trimble-T-Bolt-Antenna.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] Antenna for t-bolt
c...@omen.com said: Presumably a timing antenna would block low elevation signals to reduce multipath. Maybe, but there is a software aspect to the filter. You get to select the elevation angle. I don't remember seeing any specs about the filtering angles of various antennas. Has anybody seen something like that? -- 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.
[time-nuts] antenna for t-bolt
tvb or others on the list, Any recommendations on an inexpensive antenna to use with the Thunderbolt? Thanks, in advance! Mark -- Message: 1 Date: Mon, 19 May 2008 11:20:29 -0700 From: Tom Van Baak [EMAIL PROTECTED] Subject: Re: [time-nuts] Trimble Thunderbolt EOL Power Supply To: Discussion of precise time and frequency measurement time-nuts@febo.com Message-ID: [EMAIL PROTECTED] Content-Type: text/plain; format=flowed; charset=Windows-1252; reply-type=original Also, are the group purchase Thunderbolts new or pulled from equipment? Pulled from equipment that was never delivered. So that is about as new as you can get. /tvb ___ 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] antenna for t-bolt
These antennas work very well with the Thunderbolt: http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItemitem=280228924879 Pyrojoseph is a great seller. I've bought a lot of stuff from him over the years. This antenna will need a BNC-male/SMA-female adapter for use with the BNC-F adapter packaged with the units. If you want to use a single F-to-SMA coax adapter rather than two adapters (SMA-BNC, BNC-F), these can be ordered from http://www.cableorganizer.com , part CAD-1590. -- john, KE5FX -Original Message- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] Behalf Of Mark Amos Sent: Tuesday, May 20, 2008 3:12 PM To: time-nuts@febo.com Subject: [time-nuts] antenna for t-bolt tvb or others on the list, Any recommendations on an inexpensive antenna to use with the Thunderbolt? Thanks, in advance! Mark --- ___ 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] antenna for t-bolt
I have a Trimble Bullet, a Symmetricom HP 58532 and an inexpensive mag-mount patch antenna. All are amplified. As far as how many sats they see, they are roughly equivalent. Of course, the Bullet and HP units have narrow filters and better defined capture range (to reject reflections from the sides which can cause multipath) so they must be better for timing, but in a pinch, the patch antenna works fine for casual frequency reference applications. So far, I do not have a better reference to determine for sure which antenna works best, but hopefully that will be fixed soon. Didier KO4BB -Original Message- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Mark Amos Sent: Tuesday, May 20, 2008 5:12 PM To: time-nuts@febo.com Subject: [time-nuts] antenna for t-bolt tvb or others on the list, Any recommendations on an inexpensive antenna to use with the Thunderbolt? Thanks, in advance! Mark Internal Virus Database is out-of-date. Checked by AVG. Version: 7.5.519 / Virus Database: 269.23.11/1422 - Release Date: 5/8/2008 5:24 PM ___ 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] antenna for t-bolt
TAPR is selling a nice antenna for $10. 73, Dick, W1KSZ -Original Message- From: Mark Amos [EMAIL PROTECTED] Sent: May 20, 2008 3:12 PM To: time-nuts@febo.com Subject: [time-nuts] antenna for t-bolt tvb or others on the list, Any recommendations on an inexpensive antenna to use with the Thunderbolt? Thanks, in advance! Mark -- Message: 1 Date: Mon, 19 May 2008 11:20:29 -0700 From: Tom Van Baak [EMAIL PROTECTED] Subject: Re: [time-nuts] Trimble Thunderbolt EOL Power Supply To: Discussion of precise time and frequency measurement time-nuts@febo.com Message-ID: [EMAIL PROTECTED] Content-Type: text/plain; format=flowed; charset=Windows-1252; reply-type=original Also, are the group purchase Thunderbolts new or pulled from equipment? Pulled from equipment that was never delivered. So that is about as new as you can get. /tvb ___ 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.
