Re: LF: Smart noise cancelling?!?

[David Hine <evad_hine@yahoo.co.uk>]

Hi Stefan, Although this is a bit different, but also to do with noise, I bought a very cheap kitchen broadcast radio from Tesco for £9. It has  Long Wave on it, and I am amazed it is the only LW radio I have that can receive all the stations that still are on LW without any background noise once a station is tuned in. It can be mains powered and next to a computer or TV, and still no local noise!! The model number of this Tesco kitchen radio is RAD - 113B. On tuning to a station, it suddenly 'locks on' to it with a small 'jump'. Then the local noise totally disappears, leaving only the required LW programme interference free!! Why is this? -could it be the way this very cheap radio detects the signal? If so, the detection method used in this cheap radio would be very useful for LF work, in which local mains noise is always a big problem. Perhaps someone here also owns this Tesco radio, and can answer why it is so quiet indoors where all my other Long Wave (and much more expensive) receivers are all swamped by local noise when used indoors?? I hope this is useful. Regards, David.  

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From: DK7FC <selberdenken@posteo.de>
To: "rsgb_lf_group@blacksheep.org" <rsgb_lf_group@blacksheep.org>
Sent: Thursday, 3 November 2016, 13:22
Subject: LF: Smart noise cancelling?!?

Hi all,

Last night i thought a bit about noise cancelling on LF/VLF. Depending
on the band and distance and strength of the QRN, different settings for
a noise blanker are used, or optimal. Different rise times, treshold
levels and so on.
I thought about propagation changes and different shapes of QRN bursts
in the time domain, requiring different blanker settings.

Is it possible to program an 'intelligent' noise blanking system that is
evaluating the input spectrum, looking at the shape/type of a sferic and
automatically sets individual dynamic noise blanker parameters for each
burst?
Or do i miss something here?

Just a thought. I guess i'm not the first one who has this idea :-)

73, Stefan