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LF: 476.181 kHz from indoor loop

To: [email protected]
Subject: LF: 476.181 kHz from indoor loop
From: Markus Vester <[email protected]>
Date: Wed, 24 Jun 2015 06:11:17 -0400
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I am currently running a DFCW-60 beacon on 476.181 kHz, using the same 10m^2 indoor transmit loop as previously on LF. With 35 Watts of RF input, estimated radiated power is around 2 mW, with lobes pointing west and east.
The daytime groundwave signal is visible in the bottom panel of the DK7FC MF grabber. Going by the CCIR plots for 3 mS/m conductivity, the groundwave attenuation for this distance would be about 23 dB in excess off lossless 1/r propagation, resulting in approximately 0.2 uV/m in Heidelberg. 
Best 73,
Markus (DF6NM)

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