Further to my previous post, The U.S. Government has taken a position
in favor of an amateur allocation at 461-469 kHz and 471-478 kHz.
--
73 Warren K2ORS
WD2XGJ
WD2XSH/23
WE2XEB/2
WE2XGR/1
On Tue, Nov 2, 2010 at 10:03 AM, Warren Ziegler <[email protected]> wrote:
> Hello the list,
> The International Maritime Organization (IMO) is primarily a trade
> group but does have standing on these issues. The IMO doesn't deploy
> anything itself, what it does do is lobby governments to deploy these
> systems. If the ARRL had better lobbyists they would take then on
> directly, rather the strategy seems to be "we'll take any crumbs that
> fall off the table and be grateful for it".
> I find it interesting that the IMO let the MF spectrum lie dormant for
> decades only to rediscover an interest in it the moment someone else
> looked at using the spectrum!
>
> --
> 73 Warren K2ORS
> WD2XGJ
> WD2XSH/23
> WE2XEB/2
> WE2XGR/1
>
> On Tue, Nov 2, 2010 at 9:28 AM, Alan Melia <[email protected]> wrote:
>>
>> Whoa hardly an intrusion we are not a primary user we have to take what
>> interference they give. Some seem to forget this is not an amateur band it
>> is commercial spectrum and we have an experimental permit. Also the noise
>> increase showed on your plot is minimal ~1dB .....speclab is extermenly
>> sensitive....what you are showing would probably be regarded as
>> insignificant.
>>
>> I think this may be the French taking their normal stance of not wanting to
>> rely on US satellites and systems and trying to mollify
>> redundancy-threatened radio engineers :-)) cf Loran-C. :
>>
>> Alan
>>
>> ----- Original Message -----
>> From: "Gary - G4WGT" <[email protected]>
>> To: <[email protected]>
>> Sent: Tuesday, November 02, 2010 11:50 AM
>> Subject: Re: LF: The Wideband Noise
>>
>>
>> > Hi John & LF,
>> >
>> > The screen shot attached shows an average strength of the 498 to 502kHz
>> > signal here in NW England (IO83QO). QSB has an effect on the signal which
>> > continues throughout the darkness periods.
>> >
>> > This intrusion into the UK 500kHz band makes reception difficult.
>> >
>> > 73,
>> >
>> > Gary - G4WGT.
>> >
>> >
>> >
>> > On 1 November 2010 23:37, John P-G <[email protected]> wrote:
>> >
>> > > Hello,
>> > >
>> > > I've had some correspondence with John G3WKL and Colin G3PSM about the
>> > > new "commercial" wideband data noise that occupies 498-502kHz
>> > >
>> > > It seems to be a test of an impending data system for marine use.
>> > >
>> > > Colin would like some information about where, and when, it can be
>> > > heard or otherwise detected. It appears to be being driven by the
>> > > French.
>> > >
>> > > Forthe record I can hear it here in Shetland. It faded up tonight at
>> > > approx 1615 UTC and is audible and visible on a waterfall display.
>> > >
>> > > I haven't been in a position to DF it, but in the first instance Colin
>> > > would like to gather some information about where it is being received.
>> > >
>> > > I can collate the information for him if anyone who is affected by, or
>> > > can simply detect, this noise/data signal could give details either
>> > > direct, or via the LF group. I know a lot of discussion has been had
>> > > already, but a quick note now could be useful, as there is a meeting
>> > > soon to discuss this, and other aspects of WRC2012.
>> > >
>> > > Cheers,
>> > >
>> > > John
>> > > GM4SLV
>> > >
>> > >
>> >
>>
>>
>
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