[DX] ARRL BPL Video

[Chipn1ir@aol.com]

In a message dated 8/9/03 11:09:35 AM Eastern Daylight Time, 
K4WLS@carolina.rr.com writes:


> Near field is widely accepted to be 1/2 wavelength
> from the antenna at the operating frequency - also
> known as the Freznel Zone. Chip, thought you were
> an antenna man ???   Larry, K4WLS
> 
> 
> 


Hi Larry--

That is not correct (the 1/2 wave value). The near field depends on the 
effective aperture of the (in this case)  both antennas.  Gain antennas (depending 
on the gain) can have a near field far more than 1/2 wave away. And: what is 
the effective aperture of a long power line 15 feet above ground?

My point: these calculations are tractable but subtle. Don't let some paid 
consultant show that hams don't know what's going on and are being reactionary. 
The very best data (for Dave and others) are documented examples of 
in-the-shack RFI FROM BPL, and the ABSENCE of BPL user interference FROM hams in the 
extant service areas where BPL is up.

I hope I've made some points that will be taken to heart before the closing 
date for comments to the FCC. And, as I've already mentioned, I am not 
affiliated with the power companies. 

Best to all,
Chip N1IR


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