Re: LF: 476.181 kHz from indoor loop

[DK7FC <selberdenken@posteo.de>]

Hi Markus,

Thanks for your DFCW-30 transmission. I can see you clearly in daytime on my RX in the city! However i can't see you on my RX is the garden! The remote system seems to run stable now, at least for a longer time then in the last 3 days :-)
http://www.iup.uni-heidelberg.de/schaefer_vlf/DK7FC_remote_Grabber.html
I switched between a T antenna and a loop beaming 300/120 deg but don't see you. It appears that the hill between us is (my garden is on the hill side, the city antenna is more distant to the hill) actually reducing the SNR. So it also reduces QRN from the east and favours the west. But i would prefer an omnidirectional pattern :-/

73, Stefan

Am 24.06.2015 12:11, schrieb Markus Vester:

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)