Re: [time-nuts] GPS antenna in attic?
While NPT (US) and BSPT (UK) are different, 1/2 and 3/4 variants are both 14 threads per inch and are similar enough to intermate, but are unlikely to seal. Since sealing is not a requirement here it ought to be good enough. Failing that, maybe one of our members on the continent would send you a short piece for a nominal fee. As I understand it, all continental European plumbing that is not hard metric is BSPT, and most is not hard metric so it's a hardware store item. Rich On 11/26/2012 8:28 PM, Peter Gottlieb wrote: Unfortunately not, it's part of the molded bottom piece of the antenna casing. On 11/26/2012 9:24 PM, Chris Albertson wrote: On Mon, Nov 26, 2012 at 5:51 PM, Peter Gottlieb n...@verizon.net mailto:n...@verizon.net wrote: The antenna I got fron Nichegeek on ebay uses British Pipe Threads! Just can't get anything here that matches it. Perhaps I should just get a unit with regular NPT size threads? Can anyone recommend a specific model which works well with the Thunderbolt and has such a threaded bottom? The typical antenna has a flat bottom that is bolted to some kind of mounting adaptor. Perhaps the thing with the British treads will un-bolt. THen you can buy a pipe flange at any hardware store. -- Chris Albertson Redondo Beach, California No virus found in this message. Checked by AVG - www.avg.com http://www.avg.com Version: 10.0.1427 / Virus Database: 2629/5420 - Release Date: 11/26/12 ___ 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. -- mailto:o...@ozindfw.net Oz POB 93167 Southlake, TX 76092 (Near DFW Airport) ___ 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 antenna in attic?
I'm beginning to set up in my new house and planning where all my various antennas are going to go. Being a wood frame building, I was wondering if it was sufficient to simply mount my Thunderbolt GPS antenna high in the attic. It would be convenient as there is already a high quality CATV line running from there to my lab area that I'm not going to use and the Thunderbolt antenna system is 75 ohms. Will I have much attenuation going through an asphalt shingle roof? What if it is wet? Or has some snow on it? Another advantage for me would be I could mount that antenna on the opposite end of the house from where I will have VHF and UHF transmitter antennas. Peter 26/11/2012 08:56 I get a piece of fairly thin aluminium sheet and bend it so it slips under one roof slate, up towards the ridge, and it has another small downturn to hook over the top edge of the tile below, to stop the ali sheet slipping down and out. The exposed edge of the sheet is bent so it's horizontal. I mount the sensor on the horizontal bit, and the lead goes through a gap between the tiles, or under a tile. The lead is thin enough for this. No drilling, no potential water leaks. I have mine alongside a skylight (Velux window) so I just reached through to install it. -- Best Regards, Chris Wilson. ___ 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 antenna in attic?
Hi I've spent a lot of time putting a lot of antennas in attics of many houses. I can't say any of them didn't work. However, I never was happy with the performance of any of them. Even a poorly located outdoor antennal outperformed them. … and yes I'm a member of the no antennas outdoors club. Bob On Nov 25, 2012, at 10:15 PM, J. Forster j...@quikus.com wrote: There are ways to do it w/o drilling holes. Most all houses have vent stacks for the plumbing, typically 3 or 4 inch cast iron or thick plastic. You can clamp a couple of feet of pipe onto one of those and run the wire to under an eve or through a gable end, adding a drip loop of course. But, if it were my house and I just wanted to discipline my local standard, I'd try the attic first. Among other things, you can get to the antenna w/o climbing on the roof! New England is not sunny CA. -John On Sun, Nov 25, 2012 at 8:50 AM, Peter Gottlieb n...@verizon.net wrote: I'm beginning to set up in my new house and planning where all my various antennas are going to go. Being a wood frame building, I was wondering if it was sufficient to simply mount my Thunderbolt GPS antenna high in the attic. It will work but it will be far from optimal. All you need to do is get a big drill bit and drill through the roof and put up an iron galvanized pipe. Put a pipe flange on the end and bolt the GPS antenna to that. You will need some metal flashing and roofing tar and then you will have a first class setup. You run the coax down the pipe. The timing antennas are pointed on top so snow falls off 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. ___ 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] GPS antenna in attic?
Or install a frosted dome type skylight as a radome lights the attic and allows for better reception Sent from my iPhone On Nov 25, 2012, at 10:15 PM, J. Forster j...@quikus.com wrote: There are ways to do it w/o drilling holes. Most all houses have vent stacks for the plumbing, typically 3 or 4 inch cast iron or thick plastic. You can clamp a couple of feet of pipe onto one of those and run the wire to under an eve or through a gable end, adding a drip loop of course. But, if it were my house and I just wanted to discipline my local standard, I'd try the attic first. Among other things, you can get to the antenna w/o climbing on the roof! New England is not sunny CA. -John On Sun, Nov 25, 2012 at 8:50 AM, Peter Gottlieb n...@verizon.net wrote: I'm beginning to set up in my new house and planning where all my various antennas are going to go. Being a wood frame building, I was wondering if it was sufficient to simply mount my Thunderbolt GPS antenna high in the attic. It will work but it will be far from optimal. All you need to do is get a big drill bit and drill through the roof and put up an iron galvanized pipe. Put a pipe flange on the end and bolt the GPS antenna to that. You will need some metal flashing and roofing tar and then you will have a first class setup. You run the coax down the pipe. The timing antennas are pointed on top so snow falls off 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. ___ 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] GPS antenna in attic?
Or add vent pipe penetrations ~ 1.5 OD PVC pipe and put the GPS antenna on top of the pipe. Allows for vertical position variations. and the soft rubber gland allows for changes later. Had a new roof put on last year and I added 2 each of these plumbing vent type roof penetrations. Also added 6 each passive roof vents to keep the heat down, which could also be used for GPS antenna mounting and cable penetration. Neither roof vents nor the GPS antennas (~ at ridge line) are visible from the street. Stan, W1LE On 11/26/2012 9:22 AM, Scott McGrath wrote: Or install a frosted dome type skylight as a radome lights the attic and allows for better reception Sent from my iPhone On Nov 25, 2012, at 10:15 PM, J. Forster j...@quikus.com wrote: There are ways to do it w/o drilling holes. Most all houses have vent stacks for the plumbing, typically 3 or 4 inch cast iron or thick plastic. You can clamp a couple of feet of pipe onto one of those and run the wire to under an eve or through a gable end, adding a drip loop of course. But, if it were my house and I just wanted to discipline my local standard, I'd try the attic first. Among other things, you can get to the antenna w/o climbing on the roof! New England is not sunny CA. -John On Sun, Nov 25, 2012 at 8:50 AM, Peter Gottlieb n...@verizon.net wrote: I'm beginning to set up in my new house and planning where all my various antennas are going to go. Being a wood frame building, I was wondering if it was sufficient to simply mount my Thunderbolt GPS antenna high in the attic. It will work but it will be far from optimal. All you need to do is get a big drill bit and drill through the roof and put up an iron galvanized pipe. Put a pipe flange on the end and bolt the GPS antenna to that. You will need some metal flashing and roofing tar and then you will have a first class setup. You run the coax down the pipe. The timing antennas are pointed on top so snow falls off 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. ___ 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] GPS antenna in attic?
I considered that about 5 years ago when I reroofed. The roofing contracctor told me that anything like a skylight is very, very hard to make and keep leakproof. You really, really don't want a leaky roof. -John = Or install a frosted dome type skylight as a radome lights the attic and allows for better reception Sent from my iPhone On Nov 25, 2012, at 10:15 PM, J. Forster j...@quikus.com wrote: There are ways to do it w/o drilling holes. Most all houses have vent stacks for the plumbing, typically 3 or 4 inch cast iron or thick plastic. You can clamp a couple of feet of pipe onto one of those and run the wire to under an eve or through a gable end, adding a drip loop of course. But, if it were my house and I just wanted to discipline my local standard, I'd try the attic first. Among other things, you can get to the antenna w/o climbing on the roof! New England is not sunny CA. -John On Sun, Nov 25, 2012 at 8:50 AM, Peter Gottlieb n...@verizon.net wrote: I'm beginning to set up in my new house and planning where all my various antennas are going to go. Being a wood frame building, I was wondering if it was sufficient to simply mount my Thunderbolt GPS antenna high in the attic. It will work but it will be far from optimal. All you need to do is get a big drill bit and drill through the roof and put up an iron galvanized pipe. Put a pipe flange on the end and bolt the GPS antenna to that. You will need some metal flashing and roofing tar and then you will have a first class setup. You run the coax down the pipe. The timing antennas are pointed on top so snow falls off 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. ___ 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] GPS antenna in attic?
The tax assessors count the vent pipes when trying to guess at numbers of bathrooms, sinks, etc. in your house. Add too many, and you could be seeing an increase in your tax bill. -Chuck Harris Stan, W1LE wrote: Or add vent pipe penetrations ~ 1.5 OD PVC pipe and put the GPS antenna on top of the pipe. Allows for vertical position variations. and the soft rubber gland allows for changes later. Had a new roof put on last year and I added 2 each of these plumbing vent type roof penetrations. Also added 6 each passive roof vents to keep the heat down, which could also be used for GPS antenna mounting and cable penetration. Neither roof vents nor the GPS antennas (~ at ridge line) are visible from the street. Stan, W1LE ___ 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 antenna in attic?
They are no harder than a chimney to keep leakproof unless they are flush in which case everything said is true. You need structure and a leakproof membrane and proper flashing to redirect water Sent from my iPhone On Nov 26, 2012, at 10:38 AM, J. Forster j...@quikus.com wrote: I considered that about 5 years ago when I reroofed. The roofing contracctor told me that anything like a skylight is very, very hard to make and keep leakproof. You really, really don't want a leaky roof. -John = Or install a frosted dome type skylight as a radome lights the attic and allows for better reception Sent from my iPhone On Nov 25, 2012, at 10:15 PM, J. Forster j...@quikus.com wrote: There are ways to do it w/o drilling holes. Most all houses have vent stacks for the plumbing, typically 3 or 4 inch cast iron or thick plastic. You can clamp a couple of feet of pipe onto one of those and run the wire to under an eve or through a gable end, adding a drip loop of course. But, if it were my house and I just wanted to discipline my local standard, I'd try the attic first. Among other things, you can get to the antenna w/o climbing on the roof! New England is not sunny CA. -John On Sun, Nov 25, 2012 at 8:50 AM, Peter Gottlieb n...@verizon.net wrote: I'm beginning to set up in my new house and planning where all my various antennas are going to go. Being a wood frame building, I was wondering if it was sufficient to simply mount my Thunderbolt GPS antenna high in the attic. It will work but it will be far from optimal. All you need to do is get a big drill bit and drill through the roof and put up an iron galvanized pipe. Put a pipe flange on the end and bolt the GPS antenna to that. You will need some metal flashing and roofing tar and then you will have a first class setup. You run the coax down the pipe. The timing antennas are pointed on top so snow falls off 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. ___ 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] GPS antenna in attic?
Skylights and such are easy to keep leakproof, but you do have to check the plastic parts every once in a while. Years ago I installed one of those sun-tunnel type tubes for a small, windowless bath, and it worked great; however, about the time I replaced the roof, I discovered that the cover dome had cracks in it. Not just hazing, but cracks you could easily force a finger into! They had developed within the prior year, and when the rains began, they would have let the water in- not too much, but enough. When replacing the dome, I found that it had been acrylic, but a polycarbonate version was available for harsh climates. I ordered the latter, even though the helpfull expert said it was unnecessary. Yeah, right. -Dave - Original Message - From: Scott McGrath scmcgr...@gmail.com To: j...@quikus.com Cc: Discussion of precise time and frequency measurement time-nuts@febo.com Sent: Monday, November 26, 2012 10:52:26 AM Subject: Re: [time-nuts] GPS antenna in attic? They are no harder than a chimney to keep leakproof unless they are flush in which case everything said is true. You need structure and a leakproof membrane and proper flashing to redirect water Sent from my iPhone On Nov 26, 2012, at 10:38 AM, J. Forster j...@quikus.com wrote: I considered that about 5 years ago when I reroofed. The roofing contracctor told me that anything like a skylight is very, very hard to make and keep leakproof. You really, really don't want a leaky roof. -John = Or install a frosted dome type skylight as a radome lights the attic and allows for better reception Sent from my iPhone On Nov 25, 2012, at 10:15 PM, J. Forster j...@quikus.com wrote: There are ways to do it w/o drilling holes. Most all houses have vent stacks for the plumbing, typically 3 or 4 inch cast iron or thick plastic. You can clamp a couple of feet of pipe onto one of those and run the wire to under an eve or through a gable end, adding a drip loop of course. But, if it were my house and I just wanted to discipline my local standard, I'd try the attic first. Among other things, you can get to the antenna w/o climbing on the roof! New England is not sunny CA. -John On Sun, Nov 25, 2012 at 8:50 AM, Peter Gottlieb n...@verizon.net wrote: I'm beginning to set up in my new house and planning where all my various antennas are going to go. Being a wood frame building, I was wondering if it was sufficient to simply mount my Thunderbolt GPS antenna high in the attic. It will work but it will be far from optimal. All you need to do is get a big drill bit and drill through the roof and put up an iron galvanized pipe. Put a pipe flange on the end and bolt the GPS antenna to that. You will need some metal flashing and roofing tar and then you will have a first class setup. You run the coax down the pipe. The timing antennas are pointed on top so snow falls off 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. ___ 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] GPS antenna in attic?
If you were going to add a pipe for coax purpose, wouldn't you want something like the electrical service inlet? They have a bit of a hook on the top to reduce water penetration. ___ 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 antenna in attic?
You don't need that. Just a straight vertical pipe is perfect for a GPS antenna. All the outdoor are designed with the coax dropping straight down vertical into a pipe.All of them have a mount with pipe threads that makes a 100% waterproof connection.Lacking a mount, use a pipe flange and four stainless bolts. You will need either some sealent or a gasket between the flange and the antenna. Here is what it looks like on my house, using telephoto lens from down the street https://www.dropbox.com/s/2qec0lf48occeom/DSC_3134%20copy.jpg Notice that the coax and the connector is completely inside the pipe and never gets wet in the rain. Inside the attic the iron pipe transitions to plastic conduit. On Mon, Nov 26, 2012 at 2:35 PM, li...@lazygranch.com wrote: If you were going to add a pipe for coax purpose, wouldn't you want something like the electrical service inlet? They have a bit of a hook on the top to reduce water penetration. ___ 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. -- 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] GPS antenna in attic?
The antenna I got fron Nichegeek on ebay uses British Pipe Threads! Just can't get anything here that matches it. Perhaps I should just get a unit with regular NPT size threads? Can anyone recommend a specific model which works well with the Thunderbolt and has such a threaded bottom? Peter On 11/26/2012 8:05 PM, Chris Albertson wrote: You don't need that. Just a straight vertical pipe is perfect for a GPS antenna. All the outdoor are designed with the coax dropping straight down vertical into a pipe.All of them have a mount with pipe threads that makes a 100% waterproof connection.Lacking a mount, use a pipe flange and four stainless bolts. You will need either some sealent or a gasket between the flange and the antenna. Here is what it looks like on my house, using telephoto lens from down the street https://www.dropbox.com/s/2qec0lf48occeom/DSC_3134%20copy.jpg Notice that the coax and the connector is completely inside the pipe and never gets wet in the rain. Inside the attic the iron pipe transitions to plastic conduit. On Mon, Nov 26, 2012 at 2:35 PM, li...@lazygranch.com wrote: If you were going to add a pipe for coax purpose, wouldn't you want something like the electrical service inlet? They have a bit of a hook on the top to reduce water penetration. ___ 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] GPS antenna in attic?
On 11/26/2012 8:51 PM, Peter Gottlieb wrote: The antenna I got fron Nichegeek on ebay uses British Pipe Threads! Just can't get anything here that matches it. Perhaps I should just get a unit with regular NPT size threads? Why not just get a pipe nipple of close size, and grind off enough of the threads (if necessary) so you can JB Weld it in place, then go from 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] GPS antenna in attic?
On Mon, Nov 26, 2012 at 5:51 PM, Peter Gottlieb n...@verizon.net wrote: The antenna I got fron Nichegeek on ebay uses British Pipe Threads! Just can't get anything here that matches it. Perhaps I should just get a unit with regular NPT size threads? Can anyone recommend a specific model which works well with the Thunderbolt and has such a threaded bottom? The typical antenna has a flat bottom that is bolted to some kind of mounting adaptor. Perhaps the thing with the British treads will un-bolt. THen you can buy a pipe flange at any hardware store. -- 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] GPS antenna in attic?
I suppose, although interestingly there isn't anything close. It just misses one size and the next smaller one it swims in. Although with enough epoxy... OTOH, who cares, it's sitting up where nobody will look closely and it's not like it's a structural element. So your suggestion looks like a winner, thanks! Peter On 11/26/2012 9:19 PM, Mike S wrote: On 11/26/2012 8:51 PM, Peter Gottlieb wrote: The antenna I got fron Nichegeek on ebay uses British Pipe Threads! Just can't get anything here that matches it. Perhaps I should just get a unit with regular NPT size threads? Why not just get a pipe nipple of close size, and grind off enough of the threads (if necessary) so you can JB Weld it in place, then go from 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. - No virus found in this message. Checked by AVG - www.avg.com Version: 10.0.1427 / Virus Database: 2629/5420 - Release Date: 11/26/12 ___ 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 antenna in attic?
Unfortunately not, it's part of the molded bottom piece of the antenna casing. On 11/26/2012 9:24 PM, Chris Albertson wrote: On Mon, Nov 26, 2012 at 5:51 PM, Peter Gottlieb n...@verizon.net mailto:n...@verizon.net wrote: The antenna I got fron Nichegeek on ebay uses British Pipe Threads! Just can't get anything here that matches it. Perhaps I should just get a unit with regular NPT size threads? Can anyone recommend a specific model which works well with the Thunderbolt and has such a threaded bottom? The typical antenna has a flat bottom that is bolted to some kind of mounting adaptor. Perhaps the thing with the British treads will un-bolt. THen you can buy a pipe flange at any hardware store. -- Chris Albertson Redondo Beach, California No virus found in this message. Checked by AVG - www.avg.com http://www.avg.com Version: 10.0.1427 / Virus Database: 2629/5420 - Release Date: 11/26/12 ___ 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 antenna in attic?
You might better use RTV. I's plenty strong enough and can be taken apart if needed. -John = Unfortunately not, it's part of the molded bottom piece of the antenna casing. On 11/26/2012 9:24 PM, Chris Albertson wrote: On Mon, Nov 26, 2012 at 5:51 PM, Peter Gottlieb n...@verizon.net mailto:n...@verizon.net wrote: The antenna I got fron Nichegeek on ebay uses British Pipe Threads! Just can't get anything here that matches it. Perhaps I should just get a unit with regular NPT size threads? Can anyone recommend a specific model which works well with the Thunderbolt and has such a threaded bottom? The typical antenna has a flat bottom that is bolted to some kind of mounting adaptor. Perhaps the thing with the British treads will un-bolt. THen you can buy a pipe flange at any hardware store. -- Chris Albertson Redondo Beach, California No virus found in this message. Checked by AVG - www.avg.com http://www.avg.com Version: 10.0.1427 / Virus Database: 2629/5420 - Release Date: 11/26/12 ___ 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] GPS antenna in attic?
In practice, I suspect what I use will be what I have on hand at the moment ;-) On 11/26/2012 9:34 PM, J. Forster wrote: You might better use RTV. I's plenty strong enough and can be taken apart if needed. -John = Unfortunately not, it's part of the molded bottom piece of the antenna casing. On 11/26/2012 9:24 PM, Chris Albertson wrote: On Mon, Nov 26, 2012 at 5:51 PM, Peter Gottlieb n...@verizon.net mailto:n...@verizon.net wrote: The antenna I got fron Nichegeek on ebay uses British Pipe Threads! Just can't get anything here that matches it. Perhaps I should just get a unit with regular NPT size threads? Can anyone recommend a specific model which works well with the Thunderbolt and has such a threaded bottom? The typical antenna has a flat bottom that is bolted to some kind of mounting adaptor. Perhaps the thing with the British treads will un-bolt. THen you can buy a pipe flange at any hardware store. -- Chris Albertson Redondo Beach, California No virus found in this message. Checked by AVG - www.avg.com http://www.avg.com Version: 10.0.1427 / Virus Database: 2629/5420 - Release Date: 11/26/12 ___ 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. - No virus found in this message. Checked by AVG - www.avg.com Version: 10.0.1427 / Virus Database: 2629/5420 - Release Date: 11/26/12 ___ 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 antenna in attic?
I do not know about the Thunderbolt in particular but some GPS receivers are more sensitive than others and will work acceptably like you describe. My house has similar construction and all of my GPS receivers except maybe for my GPS18-5Hz hockey puck will operate in the attic under the asphalt shingle roof. My better ones will operate with the one ceiling in the way as well. On Sun, 25 Nov 2012 11:50:31 -0500, Peter Gottlieb n...@verizon.net wrote: I'm beginning to set up in my new house and planning where all my various antennas are going to go. Being a wood frame building, I was wondering if it was sufficient to simply mount my Thunderbolt GPS antenna high in the attic. It would be convenient as there is already a high quality CATV line running from there to my lab area that I'm not going to use and the Thunderbolt antenna system is 75 ohms. Will I have much attenuation going through an asphalt shingle roof? What if it is wet? Or has some snow on it? Another advantage for me would be I could mount that antenna on the opposite end of the house from where I will have VHF and UHF transmitter antennas. Peter ___ 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 antenna in attic?
Generally, it should work most of the time, which is probably good enough to discipline your local standard. Obviously, you want it above any foil backed insulation. Generally, near the ridge would be good, as ridges don't get that much snow cover. I've had a handhelg Garmin lock up OK in a lab on the top floor of a house, just below a similar attic. Generally, it probably won't be as good as outside on a pole, but it should work well enough. YMMV, -John = I'm beginning to set up in my new house and planning where all my various antennas are going to go. Being a wood frame building, I was wondering if it was sufficient to simply mount my Thunderbolt GPS antenna high in the attic. It would be convenient as there is already a high quality CATV line running from there to my lab area that I'm not going to use and the Thunderbolt antenna system is 75 ohms. Will I have much attenuation going through an asphalt shingle roof? What if it is wet? Or has some snow on it? Another advantage for me would be I could mount that antenna on the opposite end of the house from where I will have VHF and UHF transmitter antennas. Peter ___ 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] GPS antenna in attic?
n...@verizon.net said: I'm beginning to set up in my new house and planning where all my various antennas are going to go. Being a wood frame building, I was wondering if it was sufficient to simply mount my Thunderbolt GPS antenna high in the attic. It would be convenient as there is already a high quality CATV line running from there to my lab area that I'm not going to use and the Thunderbolt antenna system is 75 ohms. Will I have much attenuation going through an asphalt shingle roof? What if it is wet? Or has some snow on it? Another advantage for me would be I could mount that antenna on the opposite end of the house from where I will have VHF and UHF transmitter antennas. Try it. That's the only way to find out how well it works for you. Do you have software to monitor holdover? My TBolt antenna is inside, one ceiling under a similar roof. It switches into holdover several times a day. I think it happens more often when the roof is wet but I don't have numbers to back that up. No snow here so I can't comment on that. Part of my problems may be reflections (multi-path) from nearby buildings. -- These are my opinions. 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 antenna in attic?
My main GPS receiver used to see four to six satellites at a time when I used an antenna near a window in my workshop in a singe story house. I moved the antenna up into the attic near the peak, added 25 feet of TV cable, did not add any amplification, and now my system acquires and tracks eight to twelve satellites at a time. I did not want to move the antenna outside in order to reduce the chance of roof leaks and to avoid having to provide lightning strike protection. We do not get much, if any snow, and I have not noticed any problems with rain. John WA4WDL -- From: Peter Gottlieb n...@verizon.net Sent: Sunday, November 25, 2012 11:50 AM To: Discussion of precise time and frequency measurement time-nuts@febo.com Subject: [time-nuts] GPS antenna in attic? I'm beginning to set up in my new house and planning where all my various antennas are going to go. Being a wood frame building, I was wondering if it was sufficient to simply mount my Thunderbolt GPS antenna high in the attic. It would be convenient as there is already a high quality CATV line running from there to my lab area that I'm not going to use and the Thunderbolt antenna system is 75 ohms. Will I have much attenuation going through an asphalt shingle roof? What if it is wet? Or has some snow on it? Another advantage for me would be I could mount that antenna on the opposite end of the house from where I will have VHF and UHF transmitter antennas. Peter ___ 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] GPS antenna in attic?
On Sun, Nov 25, 2012 at 8:50 AM, Peter Gottlieb n...@verizon.net wrote: I'm beginning to set up in my new house and planning where all my various antennas are going to go. Being a wood frame building, I was wondering if it was sufficient to simply mount my Thunderbolt GPS antenna high in the attic. It will work but it will be far from optimal. All you need to do is get a big drill bit and drill through the roof and put up an iron galvanized pipe. Put a pipe flange on the end and bolt the GPS antenna to that. You will need some metal flashing and roofing tar and then you will have a first class setup. You run the coax down the pipe. The timing antennas are pointed on top so snow falls off 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] GPS antenna in attic?
There are ways to do it w/o drilling holes. Most all houses have vent stacks for the plumbing, typically 3 or 4 inch cast iron or thick plastic. You can clamp a couple of feet of pipe onto one of those and run the wire to under an eve or through a gable end, adding a drip loop of course. But, if it were my house and I just wanted to discipline my local standard, I'd try the attic first. Among other things, you can get to the antenna w/o climbing on the roof! New England is not sunny CA. -John On Sun, Nov 25, 2012 at 8:50 AM, Peter Gottlieb n...@verizon.net wrote: I'm beginning to set up in my new house and planning where all my various antennas are going to go. Being a wood frame building, I was wondering if it was sufficient to simply mount my Thunderbolt GPS antenna high in the attic. It will work but it will be far from optimal. All you need to do is get a big drill bit and drill through the roof and put up an iron galvanized pipe. Put a pipe flange on the end and bolt the GPS antenna to that. You will need some metal flashing and roofing tar and then you will have a first class setup. You run the coax down the pipe. The timing antennas are pointed on top so snow falls off 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. ___ 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 antenna in attic?
Another possible option is running the cable through the same hole in the roof as the vent pipe. Frequently (for bath exhaust vents and such) there is a ~4-8 tin or aluminum shroud hat around the vent pipe, and in many cases, a gap between the pipe and roofing material (the shroud opening having a mesh to keep out critters). I used the gap to run my old Z3801A cable out before I had my roof replaced. I never replaced it because I upgraded to better cable, and it was too rigid for the old path (it had to bend enough to create a drip loop to keep the water out). I never did get around to rerouting the cable, so it's at ceiling level in the office. The performance is a little worse than I used to get but not bad enough to be a problem. In my case, the vent and main stack are about 2' apart, so mounting the antenna pipe (plastic) to the main stack worked nicely. -Dave - Original Message - From: J. Forster j...@quikus.com To: Discussion of precise time and frequency measurement time-nuts@febo.com Sent: Sunday, November 25, 2012 7:15:05 PM Subject: Re: [time-nuts] GPS antenna in attic? There are ways to do it w/o drilling holes. Most all houses have vent stacks for the plumbing, typically 3 or 4 inch cast iron or thick plastic. You can clamp a couple of feet of pipe onto one of those and run the wire to under an eve or through a gable end, adding a drip loop of course. But, if it were my house and I just wanted to discipline my local standard, I'd try the attic first. Among other things, you can get to the antenna w/o climbing on the roof! New England is not sunny CA. -John On Sun, Nov 25, 2012 at 8:50 AM, Peter Gottlieb n...@verizon.net wrote: I'm beginning to set up in my new house and planning where all my various antennas are going to go. Being a wood frame building, I was wondering if it was sufficient to simply mount my Thunderbolt GPS antenna high in the attic. It will work but it will be far from optimal. All you need to do is get a big drill bit and drill through the roof and put up an iron galvanized pipe. Put a pipe flange on the end and bolt the GPS antenna to that. You will need some metal flashing and roofing tar and then you will have a first class setup. You run the coax down the pipe. The timing antennas are pointed on top so snow falls off 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. ___ 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.
