Michael, normally, I would confirm your suspicions that there are no decent wireless mics for $200 or less, but given your list of uses, you may be able to use a “less than ideal” system that suits your price range. Before I go any further, let me clarify the term a bit – What I think you really considering is a wireless “system”, not just a wirelss mic. That being said, your receiver end of the system is as important as the transmitter end. I assume you are considering a handheld transmitter and not a plug-on or beltpack.
Since you know in advance the situations in which you intend to use the system – in your case – several loud locations – you have a distinct advantage in purchasing that system. Most people being interviewed in in noisy conditions will speak loudly and in relation to the level of noise; similar to when someone listening to music with headphones will scream to others in the room when they really don’t need to. Most high-end wireless systems go to great effort to make the signal path as quiet as possible (high signal to noise ratio). Many low-cost systems suffer from poor signal-to-noise and are unacceptable for most applications. You don’t have to be as concerned about this however, because you already have ambient noise to mask the system noise.
What you do need to be concerned about are these:
– Is the system “frequency agile” so that a clear channel is available. With most metros in the US, it can be difficult to find a clean freq to use, and if your system is locked to just one and that freq is being used by another, you’re out of luck.
– Is the system durable enough to stand up to what you plan to do? Many entry-level systems are plastic, with controls that break, and connectors that fail.
– You will need a “camera mountable” receiver. It will be smaller, and be powered by 9 volt or AA bats. Many stage-type systems have a bigger receiver with an external power supply.
– You will need a receiver with a balanced, XLR output to match the input of your DVX100 (which has good preamps but real a noisy headphone amp. I monitor the RCA outs and tolerate the delay)
And finally, most wireless sytems use a circuit known as a “compander” circuit (compressor – expander). It’s a way to get more audio signal out of less radio signal and it’s the reason most wireless mic systems are unusable junk. The reason is, that with some of these designs, the greater the input signal, the more the compander circuit kicks in and then you get more distortion – which is worse than noise. Some designs (such as the original Sennheiser E500 series) have a lot of noise on the carrier signal but do a good job with the actual program signal – that would be preferable in your case.
So to summarize, you could probably find a useable system for around $200, but it would most-probably be unacceptable for other work and it might not make it through the season. Check out the Cow classified section and see if someone has a used Lectrosonics, Sony, or Sennheiser. Also, you may need to buy a separate transmitter (handheld) and receiver (camera mount) because most systems with camera mounted receivers come with beltpack transmitters.
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