[time-nuts] Antenna restrictions [was Lucent 40 dB Antenna]
lists at lazygranch.com
Sun Apr 15 09:20:58 EDT 2012
The dummy pipe would be fine.
In theory ABS makes a good radome, but in practice whatever you get at
the hardware store effects antennas significantly. [ABS and PVC is the
first thing that comes to mind when weather proofing home made
antennas.] The AWACS uses S-2 glass for it's radome. The dielectric
constant is worse than ABS, but perhaps when the dust settles, the S-2
glass can be thinner that ABS for the same strength. So perhaps in
practice it is a better radome.
S-2 glass is off the shelf if you have a Tap Plastics handy. S-2 tube
forms are easy to make with a cardboard tube and some mylar. The result
is a beige tube that is somewhat translucent.
I haven't shot mine to test out the ballistic properties.
On 4/15/2012 5:41 AM, Chuck Harris wrote:
> Yes, but you GPS antenna surely would notice the infusion
> with various fumes and chemicals that come from the vent
> pipe. Remember, the vent is open to the sewer, its purpose
> is to prevent pressure build up in the sewer from blowing
> (or sucking) the water out of the various traps and letting
> sewer gas into the house.
> However, one could add a dummy plumbing vent to the roof
> without anyone noticing.
> -Chuck Harris
> Chris Albertson wrote:
>> On Sat, Apr 14, 2012 at 11:01 PM, Perry Sandeen<sandeenpa at yahoo.com>
>>> Esteemed Time-nutters
>>> The religious answer.
>>> 1. Install antenna in as inconspicuous location as possible.
>> A GPS timing antenna should fit INSIDE a 4" plumbing vent. The ABS
>> pipe will not effect the GPS signals. Some houses will have a 4" vent
>> pipe, most will be smaller but it is easy to slip a larger diameter pipe
>> over a small one. Buy a 30 inch length of 4" black ABS drain pipe and
>> simply drop it on to of any smaller vent pipe. No one would ever notice
>> and your plumbing system will not notice either.
>> Chris Albertson
>> Redondo Beach, California
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