[UK-CONTEST] OT - RFI problem

[G4FNL]

Hi Clive / Roger / Gordon

Thanks all of you for your responses. 

Please don't worry about solving the problem - that is probably fairly
easily done by getting someone who knows about RF interference from the
Alarm Company to install some ferrite rings etc. 

No, it's the explanation to the poor guy who has to pitch up each time this
happens to switch off the alarm panel that I want. Somehow, I need to let
him know in my most diplomatic way, that it's his poorly installed alarm
system that's the cause of the trouble. However, from his perspective, if I
wasn't there - the problem goes away.......

So, just to let you know, that I have received one great idea from Paul
GW8IZR - he suggest that I explain to key holder that the interference
problem is "a bit like a leaky roof - no problem until it rains."  That's
the best analogy that I've heard - unless anyone knows better??

73 Graham G4FNL



-----Original Message-----
From: uk-contest-bounces at contesting.com
[mailto:uk-contest-bounces at contesting.com] On Behalf Of Clive Whelan
Sent: 09 May 2010 19:24
Cc: uk-contest at contesting.com
Subject: Re: [UK-CONTEST] OT - RFI problem

I agree with Gordon (!) Graham , the alarm companies know all about this 
and they have strict EC rules for RF immunity with which to comply. Mine 
was also fixed without issue. So if it is a commercial system insist ( 
diplomatically) on involving the installer. My experience was the same, 
i.e. they know exactly what to do because of more serious issues on 
commercial premises in high RF fields.

  However if it is a home brew system that is more difficult. Do you 
know what the situation is?

73


Clive
GW3NJW

On 09/05/2010 18:08, Gordon Brown wrote:
> Graham,
>               I had the same RFI problem with my burglar alarm when
transmitting on 20M.  The engineer who came to sort it out had no idea about
what I was telling him but when he got  back to his office they were aware
and came up with some ferrite beads which solved the problem. 
>          I would be interested in any replies you get because I am sending
Morse messages via next doors security light but they haven't twigged yet -
after five years and many new bulbs.
> 73 Gordon G3MZV.
>
>
>
>
> ________________________________
> From: G4FNL<g4fnl at bubloz.demon.co.uk>
> To: uk-contest at contesting.com
> Sent: Sunday, 9 May, 2010 14:26:03
> Subject: [UK-CONTEST] OT - RFI problem
>
> Folks
>
> Forgive the off topic nature - but I reckon that someone on this reflector
> will be able to help.
>
> I need to explain RFI problems that I am experiencing on a site nearby me
to
> a non-radio type person. The problem is solvable I am sure (it's RF
> breakthrough into an intruder alarm.) However, as I say, this is not at my
> QTH - it's elsewhere, and I don't really know the people involved yet as
> this appears to be an intermittent type of problem. So, what I am trying
to
> do is have an analogy ready, to explain that whilst the problem is only
> present when I am around, it's not actually my fault, and that the company
> that fitted the alarm should be called in to investigate. Has anyone found
> an analogy or example that explains RFI problem and whose 'fault' it is?
>
> Any help much appreciated
>
> 73 Graham G4FNL
>
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