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G0FTD > TECH 19.04.07 19:21l 53 Lines 2029 Bytes #999 (0) @ WW
BID : 000995108PZT
Read: GUEST OE7FMI
Subj: New propagation modelling s/ware
Path: DB0FHN<DB0FOR<DB0MRW<OK0PPL<DB0RES<ON0AR<GB7SYP<GB7PZT
Sent: 070419/1616Z @:GB7PZT.#24.GBR.EU [Kidderminster] #:99500 XSERV410h
Date: Thu, 19 Apr 2007 17:16:39 +0000
From: g0ftd@gb7pzt.#24.gbr.eu (Andy)
To: tech@ww
Subject: New propagation modelling s/ware
Two things.
I see there's a new noise modelling program from Greg Hand.
> GH_NOISE.ZIP file. This program is a proposed update to Recommendation ITU-R
> P.372-8 Combination of Radio Noise.
> This was previously known as CCIR Report 322-3 Atmospheric Radio Noise Data.
> I may use the two names interchangeably, so please excuse the confusion.
>
> The Word document itu_submission.doc is a joint submission by Australia &
> the U.S. and will be presented at meetings in April 2007.
>
> It will reproduce the results of the current DOS program NOIS2.EXE and will
> also reproduce the world map contours in Report 322-3.
>
> Download the file GH_NOISE.ZIP from the website:
> http://www.greg-hand.com/noise/
Briefly, it produces maps and figures of worldwide noise, selectable with
or as a combination of galactic, atmospheric and man made noise.
You select the season and the time band and then use the figure.
Contours are selectable from 0.01MHz - 30MHz.
At the same time there's been a recent update to the propagation modelling
engines. This file is called itshfbc_070415.exe, and I'm not sure what the
update has updated, but I'd guess it might include a new noise (Spaulding)
algorithm which is being proposed.
ITSHFBC needs to be installed before any popular user front end is used.
I use Hamcap 1.5 front end, available from www.dxatlas.com, which has links to
all the useful modelling files.
Refering back to the noise plots, probably the most useful output parameter
is "N DBW" Median hourly noise power in dBW for a noise power bandwidth of
1 Hertz at the receiver input terminals, assuming a short lossless vertical
antenna. Predicted noise power is derived from the CCIR 322-3 charts
and are for conditions when there are no local thunderstorms.
From there you can ascertain noise figures for your chosen bandwidth.
- Andy (trolley scientist) -
G0FTD @ GB7PZT
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