EAV had the pleasure of spec’ing and providing the Guiding Light Assembly church in London with a complete 12-way radio microphone solution and a digital desk for use in their weekly meetings. The GLA church have been very kind and sent us through some photos of the system all racked up and finished.
Everything you can see below is what we provided. Here is a list of the kit
1 x Custom Built Flight Case
1 x Tascam DM4800 Digital Mixer with Firewire recording card and Meterbridge
4 x Trantec S5.5 Dynamic Vocal Wireless systems on channel 70
1 x Antennae distribution system for Trantec microphones
8 x AKG WMS450 Dynamic Vocal Wireless systems on channel 38
2 x AKG antennae distribution systems
1 x AKG power supply
1 x Yamaha P7000s Amplifier
1 x 30m 24-way stage snake
1 x 30m 4-way speaker snake
1 x Cables/accessories/rack kits etc . .

The challenges you have to consider when building a system that contains more than four wireless systems is knowing which frequency bands to work on. As I am sure you all know, the free band of channel 70 (863MHz to 865MHz) will only allow you to run four wireless systems at once and anymore after that you need to go on to a licensed band. Now in the past the shared license band that you would have used would be right next to channel 70 on channel 69 (854MHz to 862MHz). Most pro wireless systems that run on channel 70 also include the channel 69 band. The problem that is now occurring for many wireless users is that channel 69 is being sold off to digital TV and a new frequency band, all the way down the frequency spectrum on channel 38 (606MHz to 614MHz) is being allocated to wireless systems. Because of the huge gap between channel 70 and channel 38, no one system includes the free frequencies on channel 70 and the licensed frequencies on channel 38. Essentially you now buy which you need and therefore careful planning is needed to make sure you can fit in and run all the systems you want.
Now some people will say that channel 38 can fit 12 wireless microphones running at the same time. So on the surface, we could have provided the GLA church with all 12 systems running on channel 38 however, after discussions with the AKG specialists at Sound Technology (UK distributes of AKG) they said they never spec more than 8 wireless mics on that band as 12 is a very tight fit and problems could occur as the spacing of the frequencies between each wireless system would be too small. Now, this meant we needed to find a space for the remaining four systems which luckily, as stated previously, is the max amount of systems that can fit on channel 70. Visit our 'Future of Wireless systems' page for more info on wireless frequencies past 2012
Another point you have to consider when using more than four or above wireless systems is antennae distribution. Basically, this is a unit that links four wireless systems together (some do more than four) via BNC cables and allows you to run those four systems off a single pair of antennae’s. If you are using more than four systems then you can link another antennae distribution unit (ADU) together and again just use a single pair of Antennae’s. In our case, the Trantec systems had one ADU unit and the AKG wireless systems had 2 ADUs and a PSU4000 which powered all the 8 wireless systems and the two ADUs. So in total, we had 16 units that were part of the wireless systems and only two mains plugs coming off them. I will touch on what other benefits come from ADUs in a separate article soon. If you look at the first picture you will see that the first 9U (or 9 rows) of equipment in the rack part of the flight case are all to do with the wireless systems and you will notice that there are only two pairs on antenna visible. Two for the Trantec systems (the white units at the very top) and two for the AKG systems (under the Trantec units)
The only other obstacle we had was providing the GLA church with a flight case/working cabinet for the equipment. This is where our custom made services come into play. We use a UK based company that make flightcases and provided them with everything that the customer wanted and what we thought would work and they designed and built it for us. The few images below show different sides of the case a little better. You can see it was made with usability in mind. There are access points for getting cables and multicores to the mixer and amps. We also provided removable lids and sides for protection whilst not in use. Next to the racking area you can see a cupboard that fits all their spare bits. The space on the top was specifically designed to house the Tascam DM4800 with its meterbridge and allow you to work the desk in the case and have access to all the rear connectors (see image below) . They are pro made units and offer fantastic protection. If you need something built then please give us a call, you may well be surprised with the prices we can offer.



It may also be worth mentioning that the multicore units we provided were also UK made and all had Neutrik connectors and were custom made to include a variety of different connectors the church required and also labeled to fit in with the system they required. Again, for any length or size, give us a call and we will quote what you require.
If you require more information on channel 38 wireless microphones , antennae distribution, custom flight cases or custom multicores then please don’t hesitate to give us a call on 0845 125 9409