Re: NEC-LIST: World Radio Noise Maps

At 05:26 AM 6/13/2005, D. B. Miron wrote:
>Good day,
>
>I have a copy of CCIR Report 65 "Revision of Atmospheric
>Radio Noise Data", ITU, Geneva, 1957 which has maps of
>average noise contours for six time blocks and four season,
>and curves of average noise vs. frequency to go with them.
>A search of the web and a reading and search of the ITU web
>site indicates that the most recent such data is CCIR Report
>322, from 1963, but this doesn't seem to be available
>anywhere. I did find an ITU Opinion that there are errors
>in 322 which ought to be fixed. Whatever their utility, I
>think a sample of these maps and curves has instructional
>value.
>1. Is the data in 322 significantly different than the data
>in 65?
>2. Is there an electronic version of these maps anywhere?
>
>Thanks,
>Doug Miron

You might also want to check out the work of Coleman, who did some
interesting work combining world lightning rate maps with propagation
models to construct site specific atmospheric noise maps.

C.J. Coleman, "The Directional Aspect of Atmospheric Noise and its Impact
upon HF Communications Systems"
University of Adelaide, South Australia

Or
C.J. Coleman, "A direction-sensitive model of atmospheric noise and its
application to the analysis of HF receiving antennas", Radio Science, Vol
37, No3, 2002

A fair amount of discussion about the ITU models in there, too.

>http://www.robomod.net/mailman/listinfo/nec-list

James Lux, P.E.
Spacecraft Radio Frequency Subsystems Group
Flight Communications Systems Section
Jet Propulsion Laboratory, Mail Stop 161-213
4800 Oak Grove Drive
Pasadena CA 91109
tel: (818)354-2075
fax: (818)393-6875

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