[aprssig] APRS Satgate Omni Antennas

Robert Bruninga bruninga at usna.edu
Wed Jul 15 08:00:13 CDT 2015


> Are the groundplane dimensions in the table above DIAMETER or RADIUS ?

Total distance across a square screen.  But could be round too.
bob

-----Original Message-----
From: Stephen H. Smith [mailto:wa8lmf2 at aol.com]
Sent: Tuesday, July 14, 2015 11:30 PM
To: Robert Bruninga; TAPR APRS Mailing List
Subject: Re: [aprssig] APRS Satgate Omni Antennas

On 7/14/2015 10:27 PM, Robert Bruninga via aprssig wrote:
> Finally did some PSAT tests with 1/4 wave on car roof and TH-D72
> Kenwood radio.
>
>
> ------------------------  original message ----------------------
>
> Some EZNEC models:
> 1/4 wave with radials:  -2 at 30 and -6 at 60  ==>  Basically a dipole
> pattern
>
> 3/4 wave with radials:  +2 at 30 and -1 at 60  ==>  4 to 5 dB better,
> 2 dBi max
> 3/4 wave w 3' gndpln:  +3 at 30 and +1 at 60 ==>  5 to 7 dB better,
> 3.3 dBi max
> 3/4 wave w 6' gndpln:  +2 at 30 and +3 at 70 ==>  4 to 9 dB better,
> 5.5 dBi max
> 3/4 wave w 9' gndpln: +3 at 30 and +3 at 65 ==>  5 to 9 dB better,5.3
> dBi max
> 3/4 wave perfect gnd: +3 at 30 and +3 at 68 ==>  5 to 9 dB better, 6.9
> dBi max
>

Are the groundplane dimensions in the table above DIAMETER or RADIUS ?

________________________________________________________

Stephen H. Smith    wa8lmf (at) aol.com
Skype:        WA8LMF
EchoLink:  Node #  14400  [Think bottom of the 2-meter band]
Home Page:          http://wa8lmf.net

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