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Re: LF: Field strength revised

To: [email protected]
Subject: Re: LF: Field strength revised
From: Väinö Lehtoranta <[email protected]>
Date: Mon, 28 Feb 2000 17:27:01 +0200
In-reply-to: <[email protected]>
Reply-to: [email protected]
Sender: <[email protected]>
Hejsan Christer,

Just curious - how do you calculate your Fs.

0.3 W at 2 km should give 68 dB(uV/m)
0.6 W at 2 km should give 71 dB(uV/m)

Both calculating and measuring Fs is difficult.

Main point is that you have very good signal!!

de Väinö, OH2LX






At 22:09 27.2.2000 +0100, you wrote:
Hello All

Thanks to PA0SE for suggesting the calibration method.
I tried this method this evening and believe I'm somewhat closer to the
truth...
Obviously the measuring loop with the connection wiring was resonant far
lower in frequency than expected. This made the figures a bit optimistic.
Now I have a 6,3 dB difference between calculated (2,4 W) and measured
radiated power (0,65 W).
More details on my home page
http://home5.swipnet.se/~w-54761/fs.htm

73
Christer
SM6PXJ
          GROUND WAVE FIELD-STRENGTH, MILLINGTON METHOD

     GW LF Ham 136. kHz  

          FIELD-STRENGTH DB ABOVE 1 MICROVOLT/METER
    
 EPS =10.0      SIG =    .5 mS/m     FREQ = 136. kHz POWER =     .30 W

                      DIST. (KM)    F-S (dBuV/m)

                        1.0            74.1
                        2.0            68.0
                        3.0            64.3
                        4.0            61.7
                        5.0            59.7
                        6.0            58.0
                        7.0            56.5
                        8.0            55.3
                        9.0            54.2
                       10.0            53.2
                       30.0            41.7
                       50.0            35.0
                       70.0            30.4
                       90.0            26.6
END OF CIRCUIT         

LOPPU
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V.K.Lehtoranta, OH2LX, POBox 50, FIN-05401 Jokela, Finland
------ Tel: +358-9-4173965 ---- Fax: +358-9-4173961 ------
E-mail: [email protected] - alias: [email protected] & [email protected]
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