🚀 go-pugleaf

123 <yano@home.com> wrote in message
news:ad2P6.5258$Ii.65924@news1.sshe1.sk.home.com...

>  At the risk of showing my age !!  These signs were
> created beforeTransistors were invented circa 1948 !

We certainly didnt have those signs at petrol stations all that time.

> At that time, it was quite common for Mobile transmitters
> to run 100 to 1000 watts output in the Short Wave Bands

Very uncommon indeed at petrol stations.

> . . At these power levels it was quite possible to ignite blasting Caps
> wired at a blasting Site ! Hence the Warning Signs to shut off the Mobile
> Transmitters  at these constuction sites, and coincidentally at fuel Depots !

Fraid not with retail petrol stations !

> In the intervening 60+  years, we now seldom use Hi-Powered
> mobile transmitters, with the exception of a few misguided CB
> operators, even most taxi's transmitters are under  50 watts.

> Our latest Cell Phones are all under 1 watt, and operate
> in the UHF bands. In the Good Old Days, it was not
> uncommon to get an RF burn off  of the transmitter's
> microphone,  never mind from the antenna !

Oh bullshit.

> Nowdays we transmit with the cell-phone antennapressed
> up against our ear!  What we are seeing  are Warning
> Signs from the Vacuum Tube era posted in the  PC age,

Wrong again. They only showed up at retail petrol stations
long after tubes stopped being used and well after CB too.

> and it doesn't really make much (any) sense at all, until you
> realize that these signs and rules and regulations were created
> three generations ago to cover situations that no longer apply.

Wrong again with retail petrol stations.

> You will occasionally see these signs posted in
> a room, right next to the Staff Microwave Oven !!

Pity what was being discussed was retail petrol stations.


> Adam <hideo@tne.net.au> wrote

> > Most of us have seen the warning signs at petrol stations telling us
> > to switch off our mobile phones. Obviously, some people believe that
> > the transmission from a mobile phone is powerful enough to induce a
> > spark in a nearby object.
> >
> > What about sensitive electronic componentry thats particularly
> > susceptible to electrostatic discharge? If a mobile phone is operated
> > near such equipment/components, is there a risk of damage? Can the
> > signal couple with a loop on a PCB and induce a voltage capable of
> > destroying a sensitive device? eg. If you're modifiying your computer
> > & receive a call on your mobile, is it actually possible to screw up
> > your motherboard if you get too close to it?
> >
> > I've spoken to an Electrical Engineer about this, and we were unable
> > to discount the possibility. If anyone knows more, please contribute.