I am on the Tesla email list and people there have noted that some of the black plumbing pipe actually has carbon black added to it -- this renders the pipe conductive and not good for a Tesla secondary form.
Would not be good for RF either. Dave > -----Original Message----- > From: time-nuts-boun...@febo.com > [mailto:time-nuts-boun...@febo.com] On Behalf Of gary > Sent: Sunday, April 15, 2012 6:21 AM > To: Discussion of precise time and frequency measurement > Subject: Re: [time-nuts] Antenna restrictions [was Lucent 40 > dB Antenna] > > 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<sandee...@yahoo.com> > >> wrote: > >> > >>> > >>> > >>> 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 > >> plastic > >> 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 > >> _______________________________________________ > >> 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.