New Wireless mics are 2.4 Ghz

Discussions around meetinghouse sound systems, microphones, assisted listening devices, and translation equipment
kreeve
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New Wireless mics are 2.4 Ghz

Postby kreeve » Sun Mar 18, 2018 11:35 am

The new wireless mics the FM ground dropped off are 2.4GHz. Not sure how the wireless internet and mics will get along, and who will interfere with who.

craiggsmith
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Re: New Wireless mics are 2.4 Ghz

Postby craiggsmith » Sun Mar 18, 2018 3:06 pm

Haven't gotten ours yet but am worried about that too. Might be a good reason to upgrade our access points to the 5 GHz Meraki units.
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Biggles
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Re: New Wireless mics are 2.4 Ghz

Postby Biggles » Sun Mar 18, 2018 3:18 pm

Assuming you are referring to the Meraki MR33’s, they are dual band 2.4 and 5Ghz. Therefore you will still have a 2.4Ghz source of possible interference?

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Re: New Wireless mics are 2.4 Ghz

Postby russellhltn » Sun Mar 18, 2018 3:55 pm

Hopefully the mics can be set to a channel different than the APs. However, since the APs select their own channel, it should be checked before each use.
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danpass
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Re: New Wireless mics are 2.4 Ghz

Postby danpass » Mon Mar 19, 2018 2:17 pm

craiggsmith wrote:Haven't gotten ours yet...


Is everyone getting wireless mics?

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Re: New Wireless mics are 2.4 Ghz

Postby russellhltn » Mon Mar 19, 2018 2:59 pm

danpass wrote:Is everyone getting wireless mics?

I can't imagine this being church-wide. Perhaps within a FM group at best.

But if you ask for one....
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kreeve
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Re: New Wireless mics are 2.4 Ghz

Postby kreeve » Mon Mar 19, 2018 3:42 pm

Our FM group received notice that the FCC had auctioned off the spectrum our current Audio-Technica mics are using. These are the same standard Audio-Technica mics the LDS church supplies to Stakes.

So I was totally surprised to see that the replacements they are buying are 2.4 GHz ones. Because we are a large double chapel YSA building, we have 8 Access points (CISCO) and around noon time 400 - 600 in the building at one time. That is a lot of RF flying around from smartphones on both 2.4 and 5 GHz.

Stake Conference the week after General Conference with a visiting authority who has requested wireless mics. (They all do now.) 600+ in our adult session, probably 3 - 4 wireless mics. It will be an interesting test.

I would say the wireless mics are in use 2 times a month on Sundays. They are especially popular with 5th Sunday lessons and ward conferences.

Hopefully Church HQ/AV/IT has thought this through?

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Re: New Wireless mics are 2.4 Ghz

Postby WA6IJD » Tue May 15, 2018 6:49 am

Are the new mics WFM or Spread Spectrum?

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Re: New Wireless mics are 2.4 Ghz

Postby russellhltn » Thu Jun 14, 2018 1:41 am

kreeve wrote:Our FM group received notice that the FCC had auctioned off the spectrum our current Audio-Technica mics are using. These are the same standard Audio-Technica mics the LDS church supplies to Stakes.


I had a chance to dig into this. Right now, we're in a transition time where the mics may or may not be legal depending on if there's a wireless carrier using those frequencies in your area. But at some channels will become illegal after July 13, 2020

Specifically, the banned frequencies are:
  • 617 - 652 MHz
  • 663 - 698 MHz
  • 698 - 806 MHz (previously banned)

Long term, the following will be legal:
  • TV channels 2-36 (about 54 - 608 MHz)
  • 614-616 MHz
  • 653-657 MHz for licensed use
  • 657-663 MHz for unlicensed use

On the older Audio-Technica mics, channel 1 (656.125 MHz) falls into 600MHz the "for licensed use" band. Channels 2-4 (659.375, 660.000, and 662.125) fall within the "for unlicensed use". Channels 5 (665.125 MHz) and up fall within the 663 - 698 MHz prohibited area. As far as power output, the units run 12mW, well below the 20mW limit for that band. I'm not sure of the bandwidth, but assuming broadcast band wide-band FM of 0.2MHz, it doesn't change the results above.

That said, I wouldn't be the least surprised but what the church wants all of these mics returned. I sure wouldn't want a bunch of these mics in the hands of people who may not follow instructions. ;)

There's also some indication (according the B&H Photo catalog) that some manufacturers are giving credits toward new mics for turning in old "illegal" mics.

Regulatory Source: FCC: Operation of Wireless Microphones
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Re: New Wireless mics are 2.4 Ghz

Postby Hagothsen » Wed Jul 18, 2018 10:58 pm

I’m sure we will be using our AudioTechs until such time as someone gets fined, or someone’s cell phone conversation hijacks audio in the chapel. No sooner.


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