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" <[email protected]> To: "Discussion of precise time and frequency measurement" <[email protected]> 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 <[email protected]> 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 -- [email protected] > To unsubscribe, go to > https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > and follow the instructions there. > > _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there. _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
