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Author Topic: 700 MHz wireless question  (Read 1552 times)

Tommy McCall

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700 MHz wireless question
« on: February 17, 2009, 08:15:23 am »

We currently use 16 sennhesier wireless microphones. There are seven in the 700MHz band, five in the 600 MHz band, And four in the 500 MHz band. Is it recommended to do away with the units in the 700 MHz band, or can we keep using them. We do not have any interference problems now.
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Brad Weber

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Re: 700 MHz wireless question
« Reply #1 on: February 17, 2009, 09:31:24 am »

Tommy McCall wrote on Tue, 17 February 2009 08:15

We currently use 16 sennhesier wireless microphones. There are seven in the 700MHz band, five in the 600 MHz band, And four in the 500 MHz band. Is it recommended to do away with the units in the 700 MHz band, or can we keep using them. We do not have any interference problems now.

I believe that the general consensus is to at least have a plan in place.  It is expected that the use of 700MHz wireless systems will soon be specifically prohibited.  In some ways this is not much of a change, most wireless users are unlicensed anyways so operating outside the rules is nothing new.  However, there will be some differences as it will no longer be a matter of being unlicensed but rather being unlicensed and operating in direct violation of the law.

As the DTV transition occurs and the licensed users of the 700MHz spectrum implement their services on a broader basis, most people will find more interference occurring.  For example Qualcomm's FloTV will probably be introduced into many areas as soon as broadcasters in their spectrum cease operations.  The DTV transition delay has probably actually made things worse in this regard as you now have broadcasters shutting down and new users coming online almost randomly, a frequency that is in use today may be clear in a month but one that is clear today may be in use in a week.  So we now have a four month period of almost constant change.

So for most people it probably comes down to two things.  First, how comfortable are you with continuing to operate if, and almost certainly when, 700MHz wireless systems are actually prohibited.  That is an ethical issue to consider.  Second, how critical is the wireless system use and can you live with the results if a bunch of new 700MHz services came on line tomorrow?  For some users, doing without a wireless either permanently or until they can get a replacement may be acceptable, for others the loss of use of one or more wireless systems might be a critical factor.  So you just need to consider how it could affect you and plan accordingly.
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Brad Weber
muse Audio Video
www.museav.com

Jeff Ekstrand

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Re: 700 MHz wireless question
« Reply #2 on: February 17, 2009, 09:32:30 am »

Today's the magic day, right?

Unless it's illegal, why not keep using them? Have a backup ready, just in case... I'm planning a wired solution as a contingency since I'm in a major-market city with quite a bit going on that could conflict with a select few wireless systems.
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Jeff Ekstrand

Technical Director, North Shore Campus
Willow Creek Community Church
Northfield, IL

Brad Weber

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Re: 700 MHz wireless question
« Reply #3 on: February 17, 2009, 10:48:29 am »

Jeff Ekstrand wrote on Tue, 17 February 2009 09:32

Unless it's illegal, why not keep using them?

Given that the vast majority of churches are unlicensed users, that is sort of ironic.  My concern with this is how many churches will keep up with the subject enough to know when the FCC enacts the rule prohibiting operating wireless mics, wireless IEMs. etc. in the 700MHz spectrum?  If you do not plan on following everything closely, then it is probably best to act as though that will happen soon.
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Brad Weber
muse Audio Video
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Henry Cohen

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Re: 700 MHz wireless question
« Reply #4 on: February 17, 2009, 11:10:29 am »

Part 74 Subpart H devices (wireless mics, coms, IEMs, IFBs) must vacate the 700MHz band at the end of the DTV transition - now June 12th (at 11:59:59pm). They will still require licenses to operate, and so far eligibility requirements have not changed. That said, Part 74 is under revision right now, but I've not heard of any eligibility revisions.

As others have said, at this time in the midst of the final (?!) stage of the transition, it's best to expect significant interference in the 700MHz spectrum at any time and have a contingency plan in place, be it hard wire or a different frequency band.
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Henry Cohen
Production Radio Rentals

ProSoundWeb Community

Re: 700 MHz wireless question
« Reply #4 on: February 17, 2009, 11:10:29 am »


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