> 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.
I believe these values are in a 1 kHz bandwidth at 3 MHz..
The help files in ICEPAC & VOACAP give the levels for a 1 Hz bandwidth at 3
MHz. Adding 30 dB for a 1 kHz bandwidth gives the values above.
This is from the help file:
ManMade Noise indicates the man-made noise level at the receiver in -dBW
(decibels below 1 Watt) in a 1 Hertz bandwidth at 3 MHz.
Default is -145 dBW.
Range [1, 2, 3, 4, 100-200], where (from CCIR Report 258):
1 = 140.4 = industrial
2 = 144.7 = residential
3 = 150.0 = rural
4 = 163.6 = remote un-populous. Here, cosmic noise will usually dominate
over man-made noise
73,
Larry N6TW
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