Topband: Accuracy of modeling of 160m verticals

[K9FD]

So true,  my AM broadcast station location with 120 330ft radials does 
not hold a
candle to the same InvL antenna at the beach with two radials.
I am about a mile inland from the beach.  Too far for any help.

73 Merv  K9FD  Molokai Island Hawaii
> Hi Ignacy,
>
>
> Salt water is very special! In a salt water environment potentially
> the entire Fresnel zone -- where as much a 6 dB of gain is obtained
> from ground reflection -- is in a highly conductive environment.
>
> Low angle radiation from a vertical with a salt water Fresnel Zone
> is much better than from an inland vertical.
>
>
> In a inland location only a very small fraction of the Fresnel Zone is
> covered by conductive radials.
>
>
> 73
> Frank
> W3LPL
>
> ----- Original Message -----
>
> From: "Ignacy Misztal" <no9e at arrl.net>
> To: topband at contesting.com
> Sent: Tuesday, November 6, 2018 8:45:28 PM
> Subject: Topband: Accuracy of modeling of 160m verticals
>
> A number of articles analyzed 160m verticals by simulation. Once the height
> was lambda/8 and the number of radials >= 16 (buried) or >=4 (elevated),
> the difference in gain was at most a few db.
>
> I operated the 2017 Stew contest from a northern beach of St George Island,
> FL. The antenna was inv L about 55 ft vertical and 90 ft horizontal,. with
> one 70ft radial elevated 5 ft.
>
> The performance was astounding. EU was heard one hr before the sunset, in
> bright sun..During the contest, EU were only slightly weaker than the US. A
> special point was easily working a DL with 100W while a well known
> contester using high power 100 miles inland could not work it.
>
> So it seemed that the salt-water enhancement was like 15 db, not a few. I
> wonder whether simulations are inaccurate with respect to radials/soil
> type or is salt water special?
>
> Ignacy, NO9E
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