No, it won't affect the waveforms, but it might affect antenna patterns due
to reflections from the large metal objects.
David Robbins K1TTT
e-mail: mailto:k1ttt@arrl.net
web: http://wiki.k1ttt.net
AR-Cluster node: 145.69MHz or telnet://k1ttt.net
-----Original Message-----
From: myles landstein [mailto:myles.landstein@gmail.com]
Sent: Saturday, June 02, 2012 00:57
To: RFI Mail Reflector
Subject: Re: [RFI] RFI from HIGH voltage power lines
aside from any possibility of interference from the lines as RFI, I wonder
if other types of interference might exist?
Perhaps being so close to the a)metal towers and or the (b) fields and
(c)wire(s) might effect your tx and or rx wave form shapes?
dunno
N2EHG
On Jun 1, 2012, at 10:07 AM, Jeff Blaine wrote:
> Related question.
>
> I'm looking to move to a place where I can put up a decent spread of
> antennas. A couple of the places have been scratched because the high
> tension lines were within 1000' or so of the potential QTH.
>
> This thread got me to thinking - can one assume a rough rule of thumb
> on distance to big lines?
>
> I realize the inverse square rule applies to any RFI problem that exists.
> Which argues a diminishing return in spacing - and concludes the
> further the better.
>
> On the other hand, I would guess the power companies would tend to
> want to fix any little thing found on the bigger lines because leakage
> or whatever on these big boys spells many problems for them. So it
> may not be as big of an issue as what one would assume?
>
> 73/jeff/ac0c
> www.ac0c.com
> alpha-charlie-zero-charlie
>
> -----Original Message-----
> From: K1TTT
> Sent: Friday, June 01, 2012 8:53 AM
> To: 'RFI Reflector'
> Subject: Re: [RFI] RFI from HIGH voltage power lines
>
> The 'beads' or 'bells' as they are usually called on the insulator
> strings are the key. As a rough guess you can assume 20-25kv line
> voltage for each glass or ceramic insulator bell in the string. So 10
> of them would give 200-250kv, the common voltage used in that range in
> the states is 230kv. If the line is well maintained it should not
> generate much interference, but you must remember that it is allowed
> to generate a little bit, so close to the line won't be as quiet as
> farther away. If you can take a mobile station there during different
> weather conditions you could get an idea about how noisy the line might
be.
>
> And yes, the 2 wires above the 3 heavy current carrying ones are for
> lightning protection.
>
> David Robbins K1TTT
> e-mail: mailto:k1ttt@arrl.net
> web: http://wiki.k1ttt.net
> AR-Cluster node: 145.69MHz or telnet://k1ttt.net
>
>
> -----Original Message-----
> From: Jim Miller KG0KP [mailto:JimMiller@STL-OnLine.Net]
> Sent: Friday, June 01, 2012 11:30
> To: RFI Reflector
> Subject: [RFI] RFI from HIGH voltage power lines
>
> Just wondering.... I have a few acres that run along HIGH power lines
and
> wonder if it is even worth considering building a small weekend
> place/hamshack there. The antennas would likely be between 100 to not
> more than 250 feet from these guys.
>
> My question is whether RFI is more likely to be generated by these
> guys verses the smaller distribution lines along the average two lane
> blacktop rural road.
>
> These lines are the big guys. If any of this helps to identify the
> amount of power, here it is. Probably a quarter mile of more average
> between supports that are three poles each. Height is estimated maybe
> about 40 feet to the lines. There are three lines and the outside
> lines of the three are about 31 feet apart. There are 10 "beads" or
> "cones" making up each of the insulators the wires are hanging on.
> There are two cables running above the power lines (maybe for
> lightning to strike them instead of the power lines themselves?). Anybody
have any idea of the voltage these would be carrying?
>
> Thanks es 73, de Jim KG0KP
>
>
>
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