[amsat-bb] Re: Antenna near gas lines?
ko6th_greg at hotmail.com
Mon Jul 21 23:37:58 PDT 2008
The only other thing I would add is to be sure that the RF doesn't find its way to the furnace's controller or thermostat. I have a dipole strung across the ridge of our roof (end-to-end, about a foot above it), with the upstairs furnace in the attic below. Depending on its mood (the only explanation I can think of), I sometimes hear strange and loud noises from up there when I work 40 meters. It doesn't happen all the time, but it can't be good when it does.
> From: domenico.i8cvs at tin.it
> To: rmann at latencyzero.com; amsat-bb at amsat.org
> Date: Tue, 22 Jul 2008 05:08:08 +0200
> Subject: [amsat-bb] Re: Antenna near gas lines?
> ----- Original Message -----
> From: "Rick Mann"
> To: "amsat Org"
> Sent: Tuesday, July 22, 2008 3:42 AM
> Subject: [amsat-bb] Antenna near gas lines?
>> Hi. Sorry for the somewhat off-topic post.
>> I recently moved into a townhouse with a lovely homeowner's
>> association. Rather than fight them putting up my antenna outside, I
>> decided to just mount it inside my attic. I found a spot about 3 feet
>> away from a vertical run of the gas line to the heater (also in the
>> attic). My first choice as a location right next to it, 'till I
>> realized it was there.
>> Should I be concerned about creating an explosion hazard? My
>> transmitter outputs a maximum of 100 W, and it's going into a Diamond
>> X-30 antenna (http://www.diamond-ant.jp/ama2/eng_ama_2_2_3.asp).
>> I wouldn't think it should be a problem, since it's metal pipe, and an
>> RF energy is unlikely to go through the gas. But sadly, I don't
>> remember what I learned when I took my test, if it even addressed this
>> Any advice would be welcome.
> Hi Rick
> Normally the metal pipes for gas are interrupted by insulating joints
> to prevent electrolitic corrosion and the RF currents induced over it
> by your antenna are flowing over the outside metal surface because
> of the skin effect and they cannot penetrate inside were the gas flow.
> 73" de
> i8CVS Domenico
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