Interesting: 3MW TX power give 8W ERP, so 0,0003% efficiency at a commercial
station on 76 Hz.
But with that 8W ERP the whole world was covered. And we talk about 120* the
frequency and for us, 300km would be enough to motivate each other to start
some experiments there ;-)
________________________________
Von: [email protected] im Auftrag von Warren Ziegler
Gesendet: Mo 22.02.2010 18:37
An: [email protected]
Betreff: Re: LF: VLF_8.79 kHz
Roger,
I believe that elf is being abandoned for use with
submarines in favor of a system that shoots lasers from satellites
into the water.
The US has shut down its 76 Hz transmitter in Clam Lake Wisconsin
which used 3 Megawatts of transmitter power to achieve an ERP of 8
watts!
Interesting write up on the web:
http://www.fas.org/nuke/guide/usa/c3i/fs_clam_lake_elf2003.pdf
--
73 Warren K2ORS
WD2XGJ
WD2XSH/23
WE2XEB/2
WE2XGR/1
On Mon, Feb 22, 2010 at 12:18 PM, Roger Lapthorn
<[email protected]> wrote:
> This is an interesting answer and today OFCOM should be tested with another
> request. I will happily do it if no-one else will.
>
> With regard to 0-9kHz induction and conduction communications, i.e.
> non-radiating systems, I wonder if they have any legal right to allocate
> "radio" licences at all? I wonder if the RA's concern was a military one -
> possibly compromising transmissions to nuclear submarines in the low VLF
> region - and they were "instructed" to give this response. If so they must
> all be paranoid.
>
> On a slightly political note, I for one wish the UK government would scrap
> our nuclear submarine deterrent and plough the billions saved into renewable
> energy research instead, but that is not for further discussion here. I'm
> happy to discuss this with others off-list.
>
> 73s
> Roger G3XBM
>
>
>
> On 22 February 2010 16:10, ALAN MELIA <[email protected]> wrote:
>>
>> Hi as far as the Uk is concerned it is not allowed. You probably need to
>> contact Andy G4JNT for details he did approach the regulator at one time
>> maybe around 2001/2 when Geri was doing his tests the answer as I remember
>> was:-
>> Frequencies below 10kHz are not allocated by International Treaty but we
>> control all frequencies between DC and gamma rays, and no we will not be
>> issuing any licences for that region.
>>
>> I believe that was the RadioCommunications Agency things may be different
>> now with Ofcomm. The best person to know whether an approach would be
>> worthwhile would be John Gould G4WKL who nursed the 500k stuff through.
>>
>> Alan G3NYK
>>
>
> http://g3xbm-qrp.blogspot.com/
> http://www.g3xbm.co.uk <http://www.g3xbm.co.uk/>
> http://www.youtube.com/user/G3XBM
> G3XBM GQRP 1678 ISWL G11088
>
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