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From The Recent AES Panel Session: “Practical Advice for Wireless Microphone Users”
Veteran panel addresses key wireless and RF issues for "typical" users
Nov. 03, 2009, by Mike Wireless
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  Wireless Systems, Aes, Wireless Microphones, Rf, Panel

Of course, frequency coordination and band planning were on the docket as well, and specifically, preparation for multiple channels of wireless systems. Frequency coordination techniques mentioned include having pre-calculated backup frequencies at the ready. Totel showed an example of band planning where there was no overlap between IFB, IEM, beltpack and handheld groups.

Winkler also brought up the importance of proper audio gain staging to achieve optimum results, not only to keep the audio optimized but also because wireless mic transmitters need a healthy signal in order to modulate the RF carrier to get a good signal at the receiver.

Some of the tools available for wireless mic planning, including spectrum analyzers of various cost ranges, software tools, and resource web sites were covered.

The summary statements from each of the panelists centered on a common theme: planning is key to success, and having backup frequencies and other fallback plans help prevent problems.

I enjoyed the panel’s discussion, and the 60 or so in the audience appeared appreciative. In fact, many of them stayed afterward to ask further questions.

It looks like AES has found a good formula and excellent panelists for this topic, and I hope to see them continue with it in years to come.

Signing off for now…
Mike Wireless

Mike Wireless is the nom de plume of a long-time RF geek devoted to better entertainment wireless system practices the world over.

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Comment (1)
Posted by Henry Cohen  on  11/04/09  at  07:20 PM
"Stoffo has previously chaired panel discussions at AES that concentrated on large-scale wireless mic installations and applications such as the Super Bowl, but this year the focus was on the “typical” wireless user - a good move."

The "typical" wireless user concept was actually brought to fruition by Jonathan Novick and Bob Lee at the 2008 convention in San Francisco for which they were the Live Sound co-chairs. Mac Kerr and I thought it prudent to continue that theme for the 2009 program.

"Coaxial cable loss was discussed in this context as well, with the recommendation to lean toward low-loss coax cables like RG213 and 9913F."

RG213 is not considered to be low loss. Whereas it has less loss than RG58 due to it's larger center conductor, it has more loss than 9913 (or 9914, LMR400, RG6 or RG11); about 6.3dB/100' @ 600MHz for the single braid RG213 versus about 3.3dB/100' @ 600MHz for the double shielded 9913.

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