[time-nuts] GPS antenna in attic?

[d.seiter at comcast.net]

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" <jfor at quikus.com> 
To: "Discussion of precise time and frequency measurement" <time-nuts at 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 <nerd at 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 
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