Join Date: Aug 2008
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Most wireless access points already run on 12V DC, so you should be able to hook it up to your system without too much trouble at all.
I imagine people will suggest that you must have a voltage regulator to make sure it still gets 12V even when the battery is a flagging a bit, or when it's hot off a charger and putting out more, but at only about £30, I'd stick it in and see how it goes. If it fries, buy a new one and get a voltage regulator.
Of course - I'm not an electrician, and I am a software engineer (who any hardware engineer worth his salt would be quick to point out knows nothing about how real computer systems work) so take that advice with a pinch of your condiment of choice.
You'll be looking for a Wireless Access Point, or Wireless Bridge, you don't need a 'broadband router' as this will include the ADSL modem bit which is no good to you and occupies the 'network uplink' port that you *will* need, I would also steer clear of any that boast "Draft-N" or 802.11n compatibility for a whole list of geeky reasons that mostly boil down to "Really not worth the extra money".