> 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.
If I understand correctly, those numbers represent an external wide
band noise floor.
Being not a noise produced internally to a receiver (or by a low noise
instrument like a spectrum analyzer), it has not a great meaning to
specify a BW unless the receiver ground floor is actually comparable
with those numbers (hopefully not).
73,
Mauri I4JMY
>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
--
FAQ on WWW: http://www.contesting.com/FAQ/rfi
Submissions: rfi@contesting.com
Administrative requests: rfi-REQUEST@contesting.com
Questions: owner-rfi@contesting.com
|