Re: LF: Re: Sub-9kHz NoV progress

[Roger Lapthorn <rogerlapthorn@gmail.com>]

It does not surprise me that the OFCOM and the Met Office have taken almost 3 months to make no decision yet on NoVs for sub-kHz, but I was doing "the right thing" by applying for one.

A reasonable response would have been to give permission to go-ahead on a "non-interference to other users" basis for a fixed period and possibly with a limit on power to the "antenna". In the absence of hearing any news I've gone ahead with occasional earth-mode transmissions at 1, 5 and 8.97kHz using just 4W on the reasonable assumption that radiated power is likely to be in the pW region and the risks to other users almost non-existant.

Were I to run hundreds of watts to a larger antenna structure then it seems reasonable to wait for the NoV. Even then, as Stefan has shown, it requires a LOT of effort to get even a couple of mW of radiated power and the true risk of interference to other users must still be tiny.

73s
Roger G3XBM

On 3 June 2010 08:11, Rik Strobbe <Rik.Strobbe@fys.kuleuven.be> wrote:

John,

 

I guess this applies only for signals above a certain level, probably the same as for unwanted radiation (harmonics, spurs) of "legal" transmissions.

In Belgium it is 0dBm below 30MHz and -26dBm above (not stated wether this is TX output power or ERP).

At VLF only ERP makes common sense (otherwise any audio amp would be illegal).

Taking into account what efforts Stefan had to do to get 1mW ERP any "back yard" experiment running reasonable power will far below this level.

 

73, Rik  ON7YD

 

BTW: below 9kHz is not regulated in Belgium, so UK dreamers band fans can consider a holiday in Belgium ;-)

 

---

Van: owner-rsgb_lf_group@blacksheep.org [owner-rsgb_lf_group@blacksheep.org] namens John Rabson [john.rabson@numeo.fr]
Verzonden: donderdag 3 juni 2010 8:42
Aan: rsgb_lf_group@blacksheep.org
Onderwerp: Re: LF: Re: Sub-9kHz NoV progress

On 3 Jun 2010, at 00:18CEST, mal hamilton wrote:

Roger

Some say a NOV is not necessary on this QRG.

It depends on the country.  The last time I asked, the Crown monopoly on UK radiocommunications (which is modified by granting licences) did apply to this part of the spectrum.  Other adminstrations may have different laws.

John F5VLF 

-- 
http://g3xbm-qrp.blogspot.com/
http://www.g3xbm.co.uk
http://www.youtube.com/user/g3xbm
G3XBM    GQRP 1678      ISWL G11088