david.elsbury Posted May 23, 2014 Share Posted May 23, 2014 Did you know that by attaching a high power variable frequency mains voltage motor drive to an induction loop you can actually make all the hearing aids levitate and cause spontaneous combustion of the carpet? No, I didn't know that. But in no way does it suprise me that you know ;) Link to comment Share on other sites More sharing options...
sam.spoons Posted May 23, 2014 Share Posted May 23, 2014 A local church experienced just such an event last month. However "St" Doris is out of hospital and fully recovered nowhttp://www.blue-room.org.uk/public/style_emoticons/default/biggrin.gif Link to comment Share on other sites More sharing options...
alistermorton Posted May 23, 2014 Share Posted May 23, 2014 Did you know that by attaching a high power variable frequency mains voltage motor drive to an induction loop you can actually make all the hearing aids levitate and cause spontaneous combustion of the carpet? Next episode in "The further adventures of Fanny Flambeaux"? Link to comment Share on other sites More sharing options...
Chappie Posted May 23, 2014 Share Posted May 23, 2014 The under-carpet copper tape is great, especially if you are designing a low-spill system. But, even if you install protection, beware of carpet fitters and stanley knives.It can also have problems in installations where it might be subjected to constant immersion in cola or other fizzy pops, such as towards the bottom of raked seating in a cinema, as it can rot through in time. We used to specialise in multi-loop induction installations in cinema multiplexes and on many occasions pulled up cola soaked carpet to find sections of loop completely missing! Link to comment Share on other sites More sharing options...
james3mc Posted May 10, 2016 Share Posted May 10, 2016 ...The other thing with induction loops the cable has to be run at floor level all around the room. You can go up over the doors and come back down the other side... Oh, why is that? I'm beginning to think that our (quite old) loop system in our small (132 seat) theatre isn't very good, but don't really know anything about them. Link to comment Share on other sites More sharing options...
smalljoshua Posted May 10, 2016 Share Posted May 10, 2016 Hi James, Chances are it isn't. Most loop systems are poorly installed and not fir for purpose. Contact the good folks at Ampetronic and they can tell you all you need to know and more about loops. Josh Link to comment Share on other sites More sharing options...
timsabre Posted May 10, 2016 Share Posted May 10, 2016 ...The other thing with induction loops the cable has to be run at floor level all around the room. You can go up over the doors and come back down the other side...Oh, why is that?I'm beginning to think that our (quite old) loop system in our small (132 seat) theatre isn't very good, but don't really know anything about them. I presume that original quote should say "can't go up over the doors"But it's not really true. It's not ideal and it creates unevenness in the signal strength in that area, but it won't make it not work. I'd second the suggestion of calling Ampetronic, they are very helpful. Link to comment Share on other sites More sharing options...
Shez Posted May 10, 2016 Share Posted May 10, 2016 A third recommendation for getting Ampetronic involved. And yes, many loop installations out there are very poorly implemented. Often by electricians who think that just running a loop of cable around the outside of the room is all that's required to produce a working system If it's a carpeted space, you can run flat tape under it and not have any troubles with doorways. I have a vague recollection that running the loop at ear height is the worst possible location for it as the signal strength is low / uneven directly within the loop. When properly designed, the ear height of the listener will be accounted for. Link to comment Share on other sites More sharing options...
timsabre Posted May 10, 2016 Share Posted May 10, 2016 If it's a carpeted space, you can run flat tape under it and not have any troubles with doorways. You will have a lot of trouble with carpet fitters though, who seem unable to remember what you told them about not slicing through the flat tape stuck to the floor which you pointed out to them several times.. Link to comment Share on other sites More sharing options...
Shez Posted May 10, 2016 Share Posted May 10, 2016 Been there. It worked fine for a few weeks as it must have still been making contact. Then it stopped working - foot traffic I guess. Located the fault to within a couple of inches across a 150m long loop with a cheap tone & probe set. Soldered a copper plate across the cut. Link to comment Share on other sites More sharing options...
david.elsbury Posted May 10, 2016 Share Posted May 10, 2016 I remember reading once that a loop installer put the flat loop tape in and connected it to a very loud alarm system so that when the installers of the carpet cut into the loop, they knew about it! ?? Link to comment Share on other sites More sharing options...
Owain Posted May 10, 2016 Share Posted May 10, 2016 Most loop systems are poorly installed and not fir for purpose. Local council fitted their high street 'customer service' office with loops at the counter and in the meeting rooms. Anyone with a loop receiver in the shopping centre next door could listen in on all the discussions about council tax and rent arrears, etc etc. Link to comment Share on other sites More sharing options...
Andrew C Posted May 11, 2016 Share Posted May 11, 2016 I remember reading once Ummm Post 9 in this thread? Link to comment Share on other sites More sharing options...
timsabre Posted May 11, 2016 Share Posted May 11, 2016 I remember reading once Ummm Post 9 in this thread? Ahh, we're all repeating ourselves like doddery old men... Link to comment Share on other sites More sharing options...
sleah Posted May 11, 2016 Share Posted May 11, 2016 Most loop systems are poorly installed and not fir for purpose. Local council fitted their high street 'customer service' office with loops at the counter and in the meeting rooms. Anyone with a loop receiver in the shopping centre next door could listen in on all the discussions about council tax and rent arrears, etc etc.That's interesting.Do those portable ones I've seen in the bank manager's office offer better privacy? Lower range I guess? How do they work then? Link to comment Share on other sites More sharing options...
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