VLF: OT - 11.7 Hz signal and multiples

[Daniele Tincani <danieletincani@yahoo.com>]

I have found that a PWM Fan Controller (like the ADM1031 from Analog Devices) can use 11.7 Hz as the PWM frequency driving the fan. I suspect that in my case the 11.7 Hz signal come from inside my PC.

Regards

Daniele

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From: Daniele Tincani <danieletincani@yahoo.com>
To: rsgb_lf_group@blacksheep.org
Sent: Mon, May 9, 2011 11:12:13 AM
Subject: Re: ELF: ZEVS transmitting from 0800UTC

Hi Eddie,

I didn't realize you are the author of the web page that I mentioned in my message below :-)

My compliments also for the very nice grabber page.

Regards

D.

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From: qrss <qrss@talktalk.net>
To: rsgb_lf_group@blacksheep.org
Sent: Mon, May 9, 2011 10:45:21 AM
Subject: Re: ELF: ZEVS transmitting from 0800UTC

Hi Daniele / Chris et al

I will take a good look at  the ZEVS breakfast code in moment, I have a burst of noise covering the start bit.

OK on the 11.7Hz Daniele, I will take a close look there too to try and establish if it is a received signal. These cariers are too stable to be from local devices I think.

73 Eddie G3ZJO





On 09/05/2011 09:30, Daniele Tincani wrote:

Hello Chris,

 

I have no doubt that that 11.7Hz-spaced lines on my SpecLab screen have a local origin. I am just curious about their source.

 

Following web page http://g3zjo-radio.blog.co.uk/ mentions 11.7Hz as one of ELF carriers visibile at the author's location ("At my urban location there are several carriers visible, 5.9Hz,8.8Hz,11.7Hz,16Hz, 23Hz and 32Hz") but it does not tell anything about the possible origin.

 

Regards

D.

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From: Chris Dillon <c.r.dillon@dsl.pipex.com>
To: rsgb_lf_group@blacksheep.org
Sent: Mon, May 9, 2011 10:17:22 AM
Subject: ELF: ZEVS transmitting from 0800UTC

Hi all - ZEVS transmitting on schedule from 0800 UTC this morning.

Eddie, Daniele - I don't have an 80Hz carrier here at IO92vf. I'll look out for the others.

Chris


On 08/05/2011 23:52, qrss wrote:

Sorry Daniele no idea 1.7Hz and multiples.

Both Stefan and I have an 80Hz constant carrier, I am also pretty sure about 16Hz 32Hz and 64Hz being received signals.
Perhaps the growing band of listeners can confirm these as also received elsewhere.

Eddie

On 08/05/2011 23:40, Daniele Tincani wrote:

I see a constant trace at 82Hz, but it appears to be 7 x 11.7Hz, as I see other similar traces at 6 x 11.7Hz (70.28Hz) and 8 x 11.7Hz (93.72Hz), etc. Does anyone know about a possible origin of these 11.7Hz-spaced carriers (or harmonics)?

Regards

Daniele