[Lowfer] VLF signals

[jrusgrove at comcast.net]

Eric

Conventional small loop antennas maintain their characteristic figure 8 pattern down through the VLF 
frequency range. Terminated loops, like the large K9AY used here, maintain their cardioid pattern 
down through VLF. I typically see F/B ratios of 15 to 20 dB at VLF. It's a bit more difficult to 
develop directional patterns at VLF with vertical antennas because of the required real estate.

Jay W1VD  WD2XNS  WE2XGR/2


----- Original Message ----- 
From: "Eric Smith" <esmithmail at gmail.com>
To: "Discussion of the Lowfer (US, European,& UK) and MedFer bands" <lowfer at mailman.qth.net>
Sent: Monday, January 04, 2016 8:47 PM
Subject: Re: [Lowfer] VLF signals


> Hi, Garry,
>
> Rank noob here regarding VLF .. so please take it easy on me .. but is
> there such a thing as a directive antenna at 12 kHz?  I would think it
> analogous the (non-) directional nature of a bass drum at low audio
> frequencies ...??
>
> Eric kd5uwl
>
>
>> On Jan 3, 2016, at 8:00 AM, Garry <k3siw at sbcglobal.net> wrote:
>>
>> Good signals here from the 3 main alpha transmitters this morning. See those plus "RSDN F4" on 
>> Laurence's KL7L grabber. Don't see the signal presumably on 12.090773 kHz here. Perhaps it's off 
>> now or has a directive antenna aimed elsewhere. Also saw a burst on 21.1 kHz. In the evening that 
>> would be from one of the RLS transmitters but here in the morning signals come in from the 
>> Pacific so think it's RJS instead, located in Vladivostok. Can't see the signal on the KL7L 
>> grabber because its present tuning range doesn't go that high.
>>
>> --
>> Garry, K3SIW, EN52ta, Elgin, IL
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