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Hemisphere
Old Croc Joined: 21 April 2008 Status: Offline Points: 2272 |
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Posted: 20 November 2014 at 8:09am |
Does anyone have any experience of these?
I've heard the idea of linking many sound systems together via radio broadcast before but haven't heard of it being put into practice. Spotted this: LINK which seems just the job for very localised (300-800 metre range) broadcast, providing all the systems had their own radio receiver.
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bitSmasher
Old Croc Joined: 23 June 2012 Location: Melbourne Status: Offline Points: 2295 |
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Something I plan on doing sooner or later... have the gear, have the idea, just don't have time/motivation
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Hemisphere
Old Croc Joined: 21 April 2008 Status: Offline Points: 2272 |
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LINK receiver chips are pretty cheap also.
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lutkeveld
Young Croc Joined: 23 September 2013 Location: The Netherlands Status: Offline Points: 517 |
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IIRC this has been used on a Boominator meetup to let them all play the same music in sync.
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bitSmasher
Old Croc Joined: 23 June 2012 Location: Melbourne Status: Offline Points: 2295 |
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Again, have a few of them to play with but haven't gotten that far yet |
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studio45
Old Croc Joined: 16 October 2007 Location: United Kingdom Status: Offline Points: 3864 |
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In my experience: Slightly larger "Tour Guide" beltpack transmitters from China eg the CZH-T200 - work very well up to about 50 metres - perfect fidelity 35Hz-15kHz - good dynamic range..... .......could not POSSIBLY comment on their legality in the UK ;) Keep out of OFCOM's way, and don't sue me if they try and fine you for going over 50uW (yes, microwatts) without a license. Note that the T200 can transmit in the range 76-108MHz so if you can find a suitable receiver, you can get right out of the UK commercial FM band. I use old Nokia "music" phones, they have an excellent FM receiver in them and a good audio output.
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Studio45 - Repairs & Building Commotion Soundsystem -Mobile PA
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MessyM2k8
Young Croc Joined: 29 October 2008 Location: Norwich Status: Offline Points: 690 |
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be careful using frequencies other than 87.5 - 108. Below 87.5, as suggested above, is used for emergency services and mod, just above 108 is used by the CAA (Civil Aviation Authority). see here for a list of last years, 2013, frequency allocation.
Another thing to remember that if using cheap transmitters you will get lots of harmonics, if you can check on a spectrum analyser to make sure your not broadcasting on multiple different frequencies Edited by MessyM2k8 - 20 November 2014 at 2:20pm |
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Hemisphere
Old Croc Joined: 21 April 2008 Status: Offline Points: 2272 |
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Hmm.. I think I'll give it a miss for now :) definitely good to know it's possible though.
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studio45
Old Croc Joined: 16 October 2007 Location: United Kingdom Status: Offline Points: 3864 |
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Yes the FM bugs have a big problem with harmonics, the tour guide's belt pack seems not to cause interference though. I didn't know about the potential interference with emergency services communications, although on close inspection of that enormous document it does seem that Mountain Rescue are allocated a band around 80 MHz, so definitely best to keep away from there. At the end of the day if "CHHH - Charlie uniform november tango, what's your position, over - CHHH" an' that starts coming thru the rigs, we'll know what's going on straight away, and turn the bloody thing off ;)
Given the fact that most people's phones can act as FM receivers, they do make 12v link-ups WONDERFULLY simple!
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Studio45 - Repairs & Building Commotion Soundsystem -Mobile PA
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