The strands are bare wire.
http://www.youtube.com/watch?v=yBF4uVqIp7U&list=PL5EE08A0B75E75744&index=2&feature=plpp_video
http://www.youtube.com/watch?v=yBF4uVqIp7U&list=PL5EE08A0B75E75744&index=2&feature=plpp_video
That's what I suspected. In that case, it will behave, electrically (even at 'high frequencies'), exactly the same as a single equivalent un-stranded solid conductor. ... leaving the reason for the size of the cable less certain! (the multi-stranded nature might just be a matter of flexibility)The strands are bare wire.
Fair enough - so about 6mm² cross-sectional area. It might be that size, and stranded, simply for 'mechanical reasons' (a single 1mm² or 2mm² conductor would be fairly 'fragile'). It might conceivably be for reasons of low resistance, as suggested by bernard but, frankly, given its short length, I very much doubt that would be the reason.By 6mm I mean it's like a core of 6mm T&E
The ratio of resistance (at DC) to the impedance ( at operating frequency ) of the wire ( not the complete coil ) affects the Q ( quality ) of the completed coil ( even when only a single turn coil )It might conceivably be for reasons of low resistance, as suggested by bernard but, frankly, given its short length, I very much doubt that would be the reason.
I realise that, but did not think that one would be needing that high a Q. Maybe I'm wrong.The ratio of resistance (at DC) to the impedance ( at operating frequency ) of the wire ( not the complete coil ) affects the Q ( quality ) of the completed coil ( even when only a single turn coil )It might conceivably be for reasons of low resistance, as suggested by bernard but, frankly, given its short length, I very much doubt that would be the reason.
Indeed - but what we don't have much of a clue about is how critical either tuning or Q is to the satisfactory functioning of this particular piece of equipment. It might be pretty tolerant in relation to both those things.So what you have to decide is learning all about aerial tuning worth it for one job?
That was my initial thinking but, on reflection, given what I presume will be a very small return signal from a passive tag (at appreciable distance), 'efficiency' may possibly be more of a consideration. However, I do very much doubt that it's going to be anything like as critical as some have suggested.The coil doesn't have to be anywhere near resonance, or to be an efficient aerial. All that matters is that a suitable tag within its field causes an identifiable change in the coil characteristics.
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