[mythtv-users] Slightly OT - Keyboards

[Brian Wood]

David Brodbeck wrote:
> Damian Surr wrote:
>> Maybe I'm just been paranoid. I'm sure a wireless keyboard would produce 
>> much less poison into the air waves than something like a mobile phone.
> 
> Mobile phones can produce up to 5 watts, if I remember right.  Most
> wireless keyboards are putting out much less than one watt, and most
> transmit only when a key is pressed.  That's about as minimal an amount
> of RF exposure as you're going to get from a wireless device.

"Full Power" analog cell phones are rated at 3 watts output. Digital
phones typically put out 100 milliwatts or less (the receiving site
sends a signal to the phone telling it to reduce output power until the
site has just enough signal).

A wireless device operating under FCC part 15 authority can put out no
more than 100 milliwatts, and typically they emit less than that.

So the actual power levels of a modern digital phone and a KB are very
close, at least the same order of magnitude, but, as was pointed out,
the KB only emits for a very brief time with each keypress, while the
phone transmits more or less continuously.



> 
> That said, I have an IR keyboard.  This one:
> http://www.pctekonline.com/skcomwirkeyw.html
> It's cheap and it works very nicely.  The range is good; even bouncing
> off walls works well.  The batteries last months as long as I don't
> accidentally set something on top of the keyboard. ;)  I don't think I
> got it from that vendor in particular; that's just the first one that
> came up when I did a Google search on the model number.