[RFI] RFI levels

i4jmy@iol.it i4jmy@iol.it"<i4jmy@iol.it
Thu, 1 Mar 2001 15:20:30 +0100

> 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).

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

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