[Date Prev][Date Next][Thread Prev][Thread Next] - [Date Index][Thread Index][Author Index]

Re: 2.4 gHzCordless Phones



Honest to God, my sources inform me the original microwave tests were on
cooking a hot dog.  2.4GHz won out because it is about the resonant
frequency of a hot dog (made it cook faster).

73,
Joe
----- Original Message -----
From: "Edward R. Cole" <al7eb@ptialaska.net>
To: <amsat-bb@AMSAT.Org>
Sent: Saturday, January 20, 2001 1:53 AM
Subject: Re: [amsat-bb] 2.4 gHzCordless Phones


> >From: "Deon Erwin" <zr1dq@qsl.net>
> >Talking about 2.4 GHz phones.  People are going crazy about 900 and 1800
MHz
> >mobile phones and cancer, but they are quite happily using 2.4 GHz
cordless
> >phones.
>
> It is a bit crazy.  BTW early microwave ovens were built for ~900 MHz but
> moved to 2.45 GHz because that frequency is more efficient for heating of
> organic tissue [may have been an freq. allocation thing as well].  Anyone
> notice the cable "ads" for a patch you put on your head that screens out
> all that nasty cordless phone RF...unbelievable!  Now you can stop
> smoking...for real.
>
> I guess if you use the 2.4G phone enough you might have sufficient
exposure
> to be concerned...but the phone bill would kill you faster!  I been
> thinking of an experiment to see how long it would take to bake a potato
> with my 2.4G spread spectrum phone.  Anyone having trouble with
> telemarketers calling their oven? OK OK getting serious:
>
> My understanding is that the 2.4G cordless is radiating only when off
hook.
>  When I get a Drake set up I'll be interested to see if there is
> interference.  In my case the solution is simple...pull the plug on the
phone!
>
> Years ago we [NASA] experimented with oven Magnetrons and I seem to recall
> that the power supplies were using avalanche diodes with little dc
> filtering.  The voltage was around 3.5 kV on the anode.  If you switch a
> high voltage like that at say half an amp there will be a fair amount RFI.
> The "maggys" are putting out broad-band noise due to this.
>
> Ed
>
> ----
> Via the amsat-bb mailing list at AMSAT.ORG courtesy of AMSAT-NA.
> To unsubscribe, send "unsubscribe amsat-bb" to Majordomo@amsat.org
>
----
Via the amsat-bb mailing list at AMSAT.ORG courtesy of AMSAT-NA.
To unsubscribe, send "unsubscribe amsat-bb" to Majordomo@amsat.org



AMSAT Top AMSAT Home