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Re: An experiment 2.4 GHz SS Cordless vs Weak Signal



in england, dont know about any where else, it clearly states in our band
plan, that we have to accept interferrence from ISM users (industrial,
scientific and medical).
so here its a case of live with it or dont use it :).

just glad i live in a small town full of old people (no offence intended :),
so are unlikely to have portable phones ;).


Speak to you later.
Scott Elliott
Scott@pieh0.co.uk
2E1FJB / M1SJE
----- Original Message -----
From: "Grant Hodgson" <grant@ghengineering.co.uk>
To: <amsat-bb@AMSAT.Org>
Sent: Monday, March 25, 2002 8:21 PM
Subject: Re: [amsat-bb] An experiment 2.4 GHz SS Cordless vs Weak Signal


> >
> > > think we need to design a 2.4g beacon that we can put in our yard to
> help
> > > keep 2.4g phones away.
> > > W4SCO
> >
> > Easy, a Microwave oven on the roof with the door open...
> >
>
> I'll ignore the obvious comments, but make this one instead  - a 'source'
at
> 2450MHz (magnetron frequency used by microwave ovens to resonate water
> molecules) is too far away (in frequency).  A frequency agile SS phone
would
> see that 2450 is blocked and go somewhere else - like 2401 - not good.
What
> would be needed is a source much closer to 2401, such as a 'personal
> attended beacon' on 2402 MHz - far enough away from the downlink such that
> the 144MHz IF radio would filter it at the IF frequency, but close enough
so
> that the phone would think that it is a blocked channel, and go somewhere
> less intrusive such as 2410, 2420 or whatever.  It would help to keep
WLANs
> away as well.
>
> In the UK, a personal attended beacon is quite legal for hams. And, if the
> power is less than 100mW, you don't even need an amateur radio licence -
> anybody can do just about anything with this part of the spectrum; no type
> approval is required as long as the power is below the 100mW threshold
(and
> there may also be limitations on high gain aerials).  But if you have an
> amateur radio licence, you can run the legal limit.....
>
> Maybe we are lucky (so far), but I don't think that there are many 2.4GHz
> cordless phones here in the UK, although there are now quite a few
wireless
> video links at this band, and they are not ussually frequency agile.
>
> Grant G8UBN
>
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