Fixed+Rotary (aircraft, not washing lines)
Join Date: Jan 2005
Location: Peak District, Yorkshire, UK
Age: 56
Posts: 357
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As already pointed out - radio *receivers* are also transmitters which is how the tuning is done...
Think about it another way - the TV detector vans, how do they know you have a TV? They pick up the signal being transmitted by your receiver. Similarly in WWII it wasn't so hard for Nazi patrols to locate and uncover illegal radio receivers from resistance forces.
On this point, I have a watch with an analogue face. Hidden in the face is a solar panel - so I don't need batteries. Additionally the watch receives signals from the clock broadcasts in the UK and Europe. So, I'm wearing a permanently switched on - albeit low power - radio receiver. Would this not be allowed on board? I can't switch it off or remove the batteries as there aren't any (well, apart from the internal rechargable which isn't accessible). I'll probably wear another watch when flying...