Re: LF: VLF

[Roger Lapthorn <rogerlapthorn@gmail.com>]

As a matter of interest, I wonder how many people in the UK have applied for a <9kHz NoVs so far since my note about OFCOM's willingness to seriously consider these a few weeks ago? I hope to submit my application this week.

My best attempts and modest power levels are unlikely to result in much radiated power at all, but I'm following with great interest the German experiments by Marcus and others. There is little doubt that some records will tumble when they optimise their systems. Good luck.

73s
Roger G3XBM

On 8 March 2010 18:42, Andy Talbot <andy.g4jnt@googlemail.com> wrote:

...wishing I'd persued the NoV application a few years ago instead of just letting it slide into oblivion...

 

Has anyone yet tried a ground loop at 9kHz?   That was going to be my first (and probably only) antenna type, running a length of wire as far away from the house as I could get-away with and connecting it to a ground stake, then feeding this against the existing local earth.   I never got round to making measurements to see what sort of ground resistance might be expected, but that would have been a lot easier than winding 1.4H air wound chokes.

 

My house backs onto a main road, and there is a drainage ditch running behide trees and foliage running for about 70m in one direction that would have made a useful route to hide a wire in.  Might have been interesting hammering in a ground stake next to the footpath at the corner of the next road though !

Andy
www.g4jnt.com

2010/3/8 Wolfgang Büscher <dl4yhf@freenet.de>

Hi Stefan,

A VLF grabber would be very fine! If you can arrange that, it would perhaps be a motivation for the dreamers ;-)
 

Well there are two now (Markus' and Paul's) .. I will try to add a third but need to get away from the local QRM. The plan is to use an UHF FM link to the remote, battery-powered site but there are some issues to be solved - one of them is the lack of dynamic range of the FM transmitter/receiver, so I may have to add some analog bandpass filtering before the FM modulator (which would render it useless for broadband VLF signals, especially natural radio signals..).

Will keep you informed, when/where another VLF 'live spectrogram' goes online.

Cheers,
 Wolf .

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