To: | [email protected] |
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Subject: | Re: LF: Re: 9kHz noise level |
From: | Roger Lapthorn <[email protected]> |
Date: | Fri, 26 Feb 2010 17:07:49 +0000 |
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Two questions... (1) Does anyone know how modes like WSPR behave with signals buried deep in impulsive noise like sferics? It seems that most of the natural noise at <9kHz is of this nature. Man-made noise is another matter. Perhaps there are certain modulation types that are well suited to get through for this sort of impulsive noise? I am no expert so have no idea but would value the views of people like Andy. (2) Regarding OFCOM and NoV permits for <9kHz is it not reasonable that they should have some overview of any transmissions (radiated, conducted or inducted) which could be sources of interference? We all appreciate that the radiated energy will be tiny, but near-field signals can be a significant interference source and over a considerable (local) distance at these very low frequencies. A most basic example could be interference to telephone, inductive loop audio systems, hi-fi or even pipe tracing systems. If any interference did occur, OFCOM would have some leads for investigation. It is not as if they are charging for NoVs. 73s Roger G3XBM On 26 February 2010 19:51, Alexander S. Yurkov <[email protected]> wrote:
-- http://g3xbm-qrp.blogspot.com/ http://www.g3xbm.co.uk http://www.youtube.com/user/G3XBM G3XBM GQRP 1678 ISWL G11088 |
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