Topband: receiving antennas

[Tom Rauch]

> I emailed W7EL regarding this matter since EZNEC2 & 3 is what
> I've used to obtain my pattern figures.  I could configure an equation/
> program to calculate such a noise figure but it would still require a lot
> of manual entry without incorporating it directly into a NEC program. That
> part is out of my league...
> 
> 73,  Bill     K0HA

Eznec exports a pattern table that may somehow be able to be 
imported into a spreadsheet, but don't ask me how to do that.

One problem with Eznec is it doesn't plot groundwave. That means 
low angle patterns are not correct, a very critical part of the 
antenna response for people who have local noise sources is 
missing!

With Beverages (and other horizontal antennas near earth), you 
can't set ground loss to zero to get an accurate view of low angle 
response near the antenna or the antenna quits working.

All things considered, any data is better than no data at all. At 
least the results would be somewhat accurate when skywave noise 
dominates.

73, Tom W8JI
w8ji@contesting.com


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