[ARC5] Balanced antenna coupling...

[Robert Eleazer]

The surprise I got was when I built one of those 2 meter collinear antennas
out of 300 ohm twin lead.  VSWR looked good.  Then I stuck it in a piece of
PVC pipe and sealed it in with silicone RTV.  VSWR went way up after that.

Also, not long ago I tried making some two section electrolytic caps by 
seling some caps in pill bottles.  I used a hot melt glue gun to secure the 
caps in the bottle.  On the one where the glue covered both the + and - 
wires the leak rate went way up.

So RTV is not good at VHF and hot melt glue is not good at HV.  Who knew?

Wayne
----- Original Message ----- 
From: "Brian" <brianclarke01 at optusnet.com.au>
To: "don davis" <dxguy at earthlink.net>; "'Robert Eleazer'"
<releazer at earthlink.net>; <arc5 at mailman.qth.net>
Sent: Sunday, December 28, 2014 3:21 AM
Subject: Re: [ARC5] Balanced antenna coupling...


> Hello Don,
> When road muck gets trapped in snow, you have a mildly conductive ground
> plane (connected to Earth via your downpipes) not too far from the
> antenna. If you have a high VSWR, there is a possibility of arcing between
> the high Voltage points and the unintended ground-plane. Also, you won't
> get much radiation - in or out - through that pesky ground-plane.
> 73 de Brian, VK2GCE.
>
> On Sunday, December 28, 2014 6:49 PM , Don said:
>
> But it's "in the attic" so snow shouldn't be too big of a problem?
>
> dd
>
>
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