I wrote:
> When I get back to the office tomorrow, I will post some
> additional info from the NTIA IONCAP/WINDOWS program (along
> with the URL to download it.)
The levels for man made noise that are cited in the program are:
-110.4 dBm - industrial
-114.7 dBm - residential
-120.0 dBm - rural
-133.6 dBm - remote
This presumably assumes an isotropic radiator. I am guessing this is a 3
kHz bandwidth. The data caem from CCIR Report 258. The measurements made by
ARRL showed somewhat lower levels.
The program has to be just about the best IONCAP-based propagation program I
have played with. It can be downloaded free from:
http://elbert.its.bldrdoc.gov/hf.html
73,
Ed Hare, W1RFI
ARRL Lab
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