[600MRG] reformatted question on Path Loss

[Edward R Cole]

Ralph,

Thanks for the links.

The first one talks about VHF and HF NVIS which is interesting as a 
comparison.  The final section that deals with 600m is apparently 
accumulate empirical data and not a path loss formula as was what I 
replied to.  I did not expect there would be a formula.

The 50% noise and 90% noise graphs are interesting in that my 
measurements in summer of 2012 with Laurence showed my 13m vertical 
with 35-dB SNR at 112km range is nearly 24/7 for the summer 
months.  I suspect it is good 365 days/year.  This exceeds the top curve.

The ground conductivity maps are probably useful everywhere but 
Alaska since longitude skips from 145 to 162 (I live at 151W 
long).  Kind of interesting that the most populated region north of 
latitude 60 is skipped.  Funny since this probably has the greatest 
concentration of AM broadcast stations in NA north of latitude 60.

But the maps are great for the rest of you...even on Ellesmere Is and Hawaii.

73, Ed - KL7UW

At 03:25 AM 8/12/2015, Ralph Wallio, W0RPK wrote:
>*See the 600m section of 
>http://showcase.netins.net/web/wallio/600m.htm and then ask Fritz 
>for use of his SNRD software to estimate 630m ground-wave 
>propagation.  See 
>https://www.fcc.gov/encyclopedia/m3-map-effective-ground-conductivity-united-states-wall-sized-map-am-broadcast-stations 
>for a Ground Conductivity map.  -- Ralph W0RPK
>
>*
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73, Ed - KL7UW
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