[TowerTalk] high tension power line noise...

[Jim Chaggaris]

 As a point of reference, HV/EHV transmission lines in the US range from 69KV-765KV.
 
HV transmisson line ratings: used in the US:
69KV
115KV
138KV
161KV
230KV
345KV
500KV (EHV)
765KV  (EHV)
 
There are also other ratings (subtransmission and distribution lines):
46KV
34.5KV
26.2KV
24.9KV
15KV Class  (12.47KV, 13.2KV, 13.8KV)
7.2KV
4.16KV
 
RFI and corona problems typically occur at the 46KV - 4.16KV due to loose connections, cracked or dirty insulators (which can track) etc...
 73,

Jim N9WW

James Chaggaris
PowerOne Corp./PowerOne Environmental
1020 Cedar Avenue
Suite 203
St. Charles, IL 60174
Phn: (630) 443-6500
Fax: (630) 443-6505
Cell: (630) 669-2241

-----Original Message-----
From: "Barry Merrill, W5GN" <w5gn at mxg.com>
Sent: Saturday, March 10, 2012 6:53pm
To: towertalk at contesting.com
Subject: Re: [TowerTalk] high tension power line noise...



My city lot (75x145) backs up to the 100 foot wide right of way for a pair of 125KV lines, on 125 foot towers,
that runs North-South. The tower to the Northwest is 225 feet from the corner of my property and hosts an AT&T array of PCS
antennas; with the beam pointed at that pylon, my noise floor is S2 but tolerable, but 30 degrees away from that tower, I hear none
of that cell hash.

I've NEVER heard the 125KV lines, even though on a few occasions with heavy fog I could audibly hear some sounds of arcing.

The tower to my Southwest is 150 feet away, in a direct line to the TV towers at Cedar Hill, 20 miles away, and back when I had a
rotatable TV antenna, I had to steer it about 40 degrees south of the direct bearing to see Channel 8 and 11.

73

Barry, W5GN

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