Re: Re: Help : RF Keyfob blocked on Driveway

[Kevin Hawkins <lists@xxxxxxxxxxxxxxxxx>]

Oh.. BTW I should add that finding out what is causing this may not be
a
solution.  As I think Ian mentioned the receivers in car alarms are very
basic designs usually and have very poor selectivity and strong signal
immunity. You may well find that the source of your problems is a
perfectly legitimate other signal ( likely to be ONOFF rather than
continuous in nature based  on your observations) and that they won't be
able to do anything to help your problem . They probably will suggest a
'better' alarm system, even though it is the same two different cars.
Do the times of the problems indicate anything useful ?  Have you ever
had problems in the wee hours of the mornings for example and does it
follow any working hours/weekend pattern.

K

Kevin Hawkins wrote:
>
> You don't want to go this route on your own, although it is the best
way
> to resolve it. UHF Spectrum analysers are expensive and complex pieces
> of equipment. If you have to investigate at yourself I would recommend
a
> more simple receiver covering the 70cm band. You can remove/play with
> aerial configurations to alter sensitivity and get limited directional
> information. You need to borrow one of these ideally.
>
> Do you have any radio amateurs living in the immediate vicinity , any
> houses with unusual looking or number of aerials .. - whereabouts are
> you & are you in a built up area ? Even knowing of one that is
within
> say 25 miles might allow you to find out about other more local ones ,
> and if they are active on 70cm, finding such a person might provide a
> loan receiver.
>
> K
>
> oughtomate wrote:
> >
> >
> >
> > That aside, could anyone advise where I can get hold of a source
> > finding specturm-analyzer-thing-majig?
> >
>
> __




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