[aprssig] APRS Satgate Omni Antennas

Stephen H. Smith wa8lmf2 at aol.com
Tue Jul 14 22:29:41 CDT 2015


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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