GPS watch

[chihuahua]

I saw a watch for sale with a built in GPS! Obviously aimed at walkers, but I could not help wondering if it would cause interferance if switched on in flight. I didn't look too closely to see if it had on/off switches for the GPS, and I have better things to spend £350 on.

[Right Stuff]

I've seen one, and apart from being ludicrously sized ('wrist wearable' is pushing it!) I hear the reception is terrible. As far as interfering with A/C systems, I would guess v.unlikely

[CharlieBrown]

GPS is only a receiver, which calculates the distance from several satalites signal. In the normal operation, it won't have EM wave transmitted.

[mad_jock]

Every reciever is a transmiter. Thats how they catch you with a TV detector van.

But i agree the power levels involved would be very unlikely to effect any systems

MJ

[FE Hoppy]

They get you because they have a list of addresses with no licence. Thats why they want to come in and have a look. Don´t let them, you don´t have to. Or pay for your licence..

[mad_jock]

Its cheaper to let the computer do the work.

And they also use to have aload of dud vans driving around which did a pretty good job of scaring everyone into buying a license.

But if the real van is about they can even tell you what channel you are watching.

MJ

[RATBOY]

Or you could move to a civilized country wher ethey don't charge you for listening to the public airwaves.


Course there are the stupid commercials all the time. And you guys get to watch Eastenders and stuff when it is new, not on public broadcasting, which doesn't have commercials unless you count the twice a year "pledge weeks" when they beg you for money.

But of course I get my television through the local cable system so I can see the commercials much more clearly and it only costs about 27 quid per month.

Hmmm. how much does that license cost?

[Knold]

18 billions...

To get back to the topic, in which way is every receiver a transmitter?

[RATBOY]

Most modern receivers are transmitters also in the sense that they emit electromagnetic radiation at radio frequencies. In the case of the GPS receiver ther are several conversions from very high frequencies and processing of the signal. This involves using oscillators that produce internal frequencies that are in parts of the radio spectrum and modulated in ways that can interfere with some communications and other systems succeptible to RF interference. These signals are not particularly powerful, but can cause problems.

Sorry for getting off topic.

[Knold]

So the "transmitting" part is just electromagnetic waste?

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Está esto el cambio de marchas?

[RATBOY]

Yep. Or noise or radio frequency byproducts or what you will, but it is still RF and you still hear it with a receiver.