Message-ID: <004e01ca0164$c2eba160$0301a8c0@mal769a60aa920>
From: "mal hamilton" <g3kevmal@talktalk.net>
To: <rsgb_lf_group@blacksheep.org>
References: <001401ca0147$dc500d20$0301a8c0@mal769a60aa920> <E1MPE8F-0003vW-7r@post.thorcom.com> <fc7eccec0907100551s60290a11i30d6089fd2cd960e@mail.gmail.com>
Date: Fri, 10 Jul 2009 14:46:00 +0100
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Subject: Re: LF: Forthcoming GPS jamming exercises
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We all know the reasons and under some circumstances justified, but so many 
now rely on and depend on its existance that perhaps we have gone down the 
wrong road. Just imagine if a major incident was about to take place and it 
was jammed for prolonged peroids. So many agencies now depend on it and 
consider it an essential navigation facility.
Of course it could also be jammed deliberately by hostile organisations 
which is even worse than a controlled exercise.
Communications satellites are also vunerable to jamming and abuse and the 
whole world communications network is virtually dependent on them with only 
limited cable alternatives.
  I think we are in a right mess and more vunerable than before the advent 
of such systems not to mention computer viruses and hackers etc.
All these gadgets and contraptions are very useful but the mistake is 
totally DEPENDING on them which is the situation we are in.
G3KEV

----- Original Message ----- 
From: "Andy Talbot" <andy.g4jnt@googlemail.com>
To: <rsgb_lf_group@blacksheep.org>
Sent: Friday, July 10, 2009 1:51 PM
Subject: Re: LF: Forthcoming GPS jamming exercises


Ask yourself why it may be advantageous to jam GPS is a war scenario,
and just how GPS is likely to be used by both sides.
Then consider how it may be done in a sensible manner, how to avoid
excessive fratricide and why excercises such as these may have to be
performed.

Ask yourself why Selective Availability was removed some years ago.

May like to also wonder if the substation located at exactly that
specified location could have anything to do with the exercise.

Andy  G4JNT
www.g4jnt.com



2009/7/10 Michael Probert GW4HXO <mikegw4hxo@solva.co.uk>:
> Hello Finbar,
>
> Maybe Mal has a point? Seems a bit odd that the MOD are going to jam an
> important service for a couple of hours. Can you imagine it they jammed TV
> for a day or two, would be nice!
>
> Best regards
>
> Mike
>
> -----Original Message-----
> From: owner-rsgb_lf_group@blacksheep.org
> [mailto:owner-rsgb_lf_group@blacksheep.org] On Behalf Of mal hamilton
> Sent: 10 July 2009 11:19
> To: rsgb_lf_group@blacksheep.org
> Subject: Re: LF: Forthcoming GPS jamming exercises
>
> Like I said when the big BANG comes the Appliance operator and his data
> gadgets will be rendered useless, whereas a Radio Amateur with his 2 
> valved
> RX/TX, a morse key, a piece of wire for antenna and a pedal powered power
> source will communicate on.
> We all managed to commumicate and navigate this past 100 years without 
> these
>
> gadgets, unfortunately today the majority seem to be totally dependant on
> computers and associated data devices. These gadgets are handy but make a
> person LAZY and forgetful about how to write and operate CW as a tool to
> communicate.
> G3KEV
>
> ----- Original Message -----
> From: "Dave Pick" <daveyxm@googlemail.com>
> To: <rsgb_lf_group@blacksheep.org>
> Sent: Friday, July 10, 2009 8:11 AM
> Subject: Re: LF: Forthcoming GPS jamming exercises
>
>
> Perhaps we should encourage a Loran jamming excercise to prove that it
> isn't the un-jammable marvel that its cracked up to be?
>
> ;-)
>
> Dave G3YXM
>
> 2009/7/9 Dave G3WCB <ganymede444@btopenworld.com>:
>> Hmmm... I can only see an electricity substation at that exact
>> location...the source will probably on Henley's Down or somewhere 
>> similar.
>>
>> It'll mess-up any GPS-disciplined beacons (LF or Microwave)for a few
>> hours!
>>
>> 73, Dave G3WCB IO91RM
>>
>> -----Original Message-----
>> From: owner-rsgb_lf_group@blacksheep.org
>> [mailto:owner-rsgb_lf_group@blacksheep.org]On Behalf Of Andy Talbot
>> Sent: 08 July 2009 22:36
>> To: ukmicrowaves@yahoogroups.com; uk_beacons@yahoogroups.com;
>> rsgb_lf_group@blacksheep.org
>> Subject: LF: Fwd: Fw: Ofcom Update: Date Correction - Forthcoming GPS
>> jamming exercises
>>
>>
>> The Lat/Long converts to:
>> Loc. JO00FV41
>> NGR TQ723122
>>
>> Andy
>> www.g4jnt.com
>>
>> --- On Wed, 8/7/09, Updates <Updates@ofcom.org.uk> wrote:
>>
>> From: Updates <Updates@ofcom.org.uk>
>> Subject: Ofcom Update: Date Correction - Forthcoming GPS jamming 
>> exercises
>> To:
>> Date: Wednesday, 8 July, 2009, 11:14 AM
>>
>> The MoD has informed Ofcom of the following GPS jamming exercise:
>>
>> Dates: 14th and 15th October 2009.
>>
>> Times: Maximum of two hours between the times of 08:00-12:00 and
>> 13:30–15:30 each day.
>>
>> Location: Within 1km of N50° 53.0’ and E000° 27.0’ (Bexhill, East 
>> Sussex).
>>
>> Contact: Trial Manager (during the trial) on 07776 484226.
>>
>>
> ...........................................................................
>>
>>
>>
>
>
>
> --
> G3YXM IO92BK Birmingham UK
>
>
>
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>



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