[UK-CONTEST] OT - RFI problem

[Clive Whelan]

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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