Return to KLUBNL.PL main page

[Top] [All Lists]

Re: LF: 476.181 kHz from indoor loop

To: <[email protected]>
Subject: Re: LF: 476.181 kHz from indoor loop
From: "Markus Vester" <[email protected]>
Date: Fri, 26 Jun 2015 21:04:38 +0200
Dkim-signature: v=1; a=rsa-sha256; c=relaxed/relaxed;; s=20150623; t=1435345483; bh=+Ewo5iXIONe8Hjkaa9Qgit6yxBho/3KE2c6bnCMI6O0=; h=From:To:Subject:Message-ID:Date:MIME-Version:Content-Type; b=NkqQ9ZX6A/8T8rNXGdRGtp/8S+5IxPxwPwIX7N1Ke77F4ZzqyhQBIdzjZjbJH0sgq 1NRKu0Yq7s26DrwT+g0ArI5TEUMrAjAZpbB6QonwrjaL/vOua4JhtTag0ZtI6baUyj jEyP21PSmWZ0sChZjcFLsWseMg5hPfO/yOKLNSyY=
Importance: Normal
References: <[email protected]> <[email protected]>
Reply-to: [email protected]
Sender: [email protected]
Hi Stefan,
good to see the remote station working nicely now.
>> but don't see you
...yes you do ;-) There is a slight frequency offset in the remote grabber which had put me out of your QRSS-30 band. I now switched to my "heritage" QRG 136172.5 ahem 476172.5 Hz, and voila there it is, loud and clear.
Currently still on the low Marconi, also about 2 mW EMRP.  The relatively strong coupling to the LF grabber E-field antenna produced some aliases and noise there, which have been mitigated by a 475 kHz Saugkreis (trap) - same as in old AM radios ;-)
 73, Markus

From: DK7FC
Sent: Friday, June 26, 2015 7:46 PM
Subject: Re: LF: 476.181 kHz from indoor loop

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 :-)
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)

<Prev in Thread] Current Thread [Next in Thread>