More propagation plots

Post date: Oct 21, 2020 11:10:59 PM

Related to these articles:

• RF Coverage Comparison

• 2m vs 70cm coverage

• VHF vs. UHF in hills

I did another set of plots, this time comparing 2 previously-reviewed sites and adding one more that I hadn't examined before.

The files are attached below; if you download them to the same directory, you can use your favorite image viewer to flip between them and compare propagation.

Plot sets

There are two sets of plots for the 3 houses:

2m repeater

0. My house*

1. My house

2. Englemans

3. Pecks

*I did two plots from my house. The 1st was the one from 2012, a fairly optimistic view that pretty much shows the limits of what I could work

from my house with my main antenna. The 2nd one is a little more conservative, representing less power and not as good an antenna. It's

more representative of the performance that a modest mobile (i.e. vehicle, not hand-held) station could expect if they were using a

repeater at my house. The parameters I used for that 2nd plot are the same ones I used for the other two sites so that the geography is directly comparable.

GMRS repeater

The 2nd set has 3 more plots for the same 3 locations, but this time it was modeled assuming that the people at the other end are using low-power GMRS radios. Again, you can flip between pictures to compare the 3 locations.Note that the GMRS plots are zoomed way in compared to the ham plots (since the coverage area's much smaller), so you can't just flip between two pics to quickly compare the details of ham vs GMRS at a site.