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Helical or paddle antenna for both IEM and WL mics
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<blockquote data-quote="Paul Johnson" data-source="post: 216636" data-attributes="member: 2643"><p>The reality of on stage radio use is that the distance from stage left to stage right is so small that a full signal strength reading from even a low power wireless unit is not a feat of any kind. 1W can get you up to the space stations in orbit. Line-of-sight is exactly what it says. If you can see it, it will work. The issue is things in the way, and reflections. Those dead spots we all have noticed. Antennas can have gain, but usually at the expense of coverage. If you tour a show, then your system that works in one venue should work in another, unless things make you move your gear and people in relation to each other. </p><p></p><p>We also did not cover polarisation changes - very tricky when you look at hand-held's being waved around. A vertical antenna on the receiver can be totally solid, but rotate it through 90 degrees and the signal strength can drop to almost nothing. We spoke about helical antennas - usually a way to produce a functional antenna in a smaller package by coiling the wire. We can also have another helical antenna where a spiral is used to produce an antenna that works effectively on any polarisation - so rotating the transmit antenna doesn't do anything. We can add reflectors, creating a more cardioid pattern, with a distinct 'rear'. We often think of the paddle antennas as 'beams' - but most are log-periodic designs capable of operating over a wider frequency range. They do have a directivity - but not as much as you'd imagine. With diversity operation, the idea really is to make sure that there are no zero level dead spots, not that there is maximum signal. The plan is just to create coverage where the signal strength remains good, everywhere people will be working, and not waste it on areas that don't matter. </p><p></p><p>There is NO single antenna that does this. Simple dipoles, small yagis, log-periodics, helicals and other designs are just tools for different jobs. It is NOT magic and it is NOT something where any of them at any cost will solve a problem.</p></blockquote><p></p>
[QUOTE="Paul Johnson, post: 216636, member: 2643"] The reality of on stage radio use is that the distance from stage left to stage right is so small that a full signal strength reading from even a low power wireless unit is not a feat of any kind. 1W can get you up to the space stations in orbit. Line-of-sight is exactly what it says. If you can see it, it will work. The issue is things in the way, and reflections. Those dead spots we all have noticed. Antennas can have gain, but usually at the expense of coverage. If you tour a show, then your system that works in one venue should work in another, unless things make you move your gear and people in relation to each other. We also did not cover polarisation changes - very tricky when you look at hand-held's being waved around. A vertical antenna on the receiver can be totally solid, but rotate it through 90 degrees and the signal strength can drop to almost nothing. We spoke about helical antennas - usually a way to produce a functional antenna in a smaller package by coiling the wire. We can also have another helical antenna where a spiral is used to produce an antenna that works effectively on any polarisation - so rotating the transmit antenna doesn't do anything. We can add reflectors, creating a more cardioid pattern, with a distinct 'rear'. We often think of the paddle antennas as 'beams' - but most are log-periodic designs capable of operating over a wider frequency range. They do have a directivity - but not as much as you'd imagine. With diversity operation, the idea really is to make sure that there are no zero level dead spots, not that there is maximum signal. The plan is just to create coverage where the signal strength remains good, everywhere people will be working, and not waste it on areas that don't matter. There is NO single antenna that does this. Simple dipoles, small yagis, log-periodics, helicals and other designs are just tools for different jobs. It is NOT magic and it is NOT something where any of them at any cost will solve a problem. [/QUOTE]
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Helical or paddle antenna for both IEM and WL mics
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