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For your help we have provided some frequently asked technical questions and answers.
 
  Technical Questions  
   Is my choice of Lapel/Headset Mic limited when using wireless beltpacks?  
  Not at all! There is a wide selection of Lapel Mics and Headsets, which we would recommend for use in wireless systems that cover most possible situations. However it is possible to connect most lapels and headsets to beltpacks, only in very rare situations is this impossible.

 
   VHF or UHF, which is better?  
  VHF can be classed as the first generation wireless audio equipment, which was soon followed by the introduction of UHF systems. VHF systems tend to be fixed frequency, crystal based, where as UHF equipment is normally based around synthesised frequency generators allowing the frequency to be adjusted via switches or software. This frequency agility is what gives UHF the upper hand, as well as better audio performance with better stability and a reduced chance of interference.

With the advent of fixed frequency UHF systems, everyone can have the benefits of UHF at a price to suit. Making it the ideal time to upgrade from your old VHF equipment. The following situations are just perfect for fixed frequency UHF:

1. Performers that are just starting out and not sure if wireless is for them.
2. Venue operators who may need a wireless system for on stage announcers.
3. Guitarists who want to lose the cable.
4. Comedians, Stand-up Entertainers, Magicians, and Compares can all benefit from a wireless system, which simply plugs in to the house sound system and is easy to load out.

 
   What is an ADA (Antenna Distribution Amplifier), what does it do? and when do I need to use it?  
  When you have several systems running together all their related antenna can look very unattractive and affect performance. To the rescue we have ADA's which amplify and distribute the signal from one set of aerials to several receivers. This also allows the use of remote antenna that is very useful when the working area is large, allowing accurate antenna placement. The other benefits include the ability to locate the receiver's further away from the stage area, to have the receiver's packaged in a single rack, reducing load in and load out times.

We normally would recommend an ADA to be used when there are more than 4 systems being used in one location. You should note ADA's normally have a maximum of 5 outputs and are frequency specific, so set-ups consisting of large number of systems or various frequency bands may need more than one ADA. For multiple system sales or hire quotes we will take care of specifying the number of ADA's required if any, and the best packaging method for the set-up.

 
   How many systems can I run together?  
  There is no definite answer on this. There are several factors, which limit the number of systems that can work together. Firstly you have the frequency constraints on the systems available, followed by the limit on which frequencies can be licensed for use. As the number of systems goes up, so does the problem of Intermodulation and the harder it gets to work around it. Finally, local conditions have the final bearing on how many systems can be run.

You may have managed to get all the systems you need running, but a low level rogue transmission in another part of the spectrum could be enough to throw your frequency planning in to total disarray. The good news however is that with good frequency management and equipment selection we have had success running over 40 systems together at The Disney Awards show in London Docklands Arena. This was a combination of In-Ear Systems, Lapels and Hand Held Microphones.

 
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Hand Held Audio, Unit 2, 12-48 Northumberland Park, London N17 0TX, UK. Tel: +44 (0) 20 8880 3243. Fax: +44 (0) 20 8365 1131.