[time-nuts] Antenna restrictions [was Lucent 40 dB Antenna]

[DaveH]

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-bounces at febo.com 
> [mailto:time-nuts-bounces at 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<sandeenpa at 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
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