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Author Topic: Google gains approval from FCC to use TV whitespace for internet service  (Read 2948 times)

Tommy Peel

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Wonder what this could do to wireless Mic systems....

http://us.appy-geek.com/Web/ArticleWeb.aspx?regionid=1&articleid=10663457

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Mac Kerr

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Wonder what this could do to wireless Mic systems....

http://us.appy-geek.com/Web/ArticleWeb.aspx?regionid=1&articleid=10663457

Sent from my Milestone X using Tapatalk 2

This is just one of the many TVBDs that will fill the "white spaces". It was this use that primarily drove the reallocation of the UHF bands. This is what has been discussed for the last 5 years on these and other forums.

There are 2 "protected" TV bands in each market for use by wireless mics. These are different in each TV market, but are the first unused band below ch37, and the first unused band above ch37. These are the frequencies you should plan on using first. With proper planning you should be able to get at least 12, and most likely more, mics into these 2 bands.

Unused TV channels that are adjacent to an active TV channel are also off limits for mobile TVBDs, so should be relatively safe for wireless mic operation. Unused TV channels that are not adjacent to an active TV channel will be open for use by TVBDs, and in the future may be unusable for that reason. For today, where there are few (no?) TVBDs operating they are probably fine.

It is becoming increasingly important that care is taken in choosing frequencies for wireless mics. There is commercial software from PWS, Stage Research, and Kaltman Creations, and probably others, that helps in RF planning by identifying unused TV channels in your zip code, and calculating intermod free frequencies. There are also free versions from Shure, and Sennheiser.

When using more than a couple of wireless mics, it is increasingly important to take the time to find the best RF frequencies you can. There are plenty of tools available to help you do that.

Mac
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Jason Glass

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    • CleanWirelessAudio.com

This is just one of the many TVBDs that will fill the "white spaces". It was this use that primarily drove the reallocation of the UHF bands. This is what has been discussed for the last 5 years on these and other forums.

There are 2 "protected" TV bands in each market for use by wireless mics. These are different in each TV market, but are the first unused band below ch37, and the first unused band above ch37. These are the frequencies you should plan on using first. With proper planning you should be able to get at least 12, and most likely more, mics into these 2 bands.

Unused TV channels that are adjacent to an active TV channel are also off limits for mobile TVBDs, so should be relatively safe for wireless mic operation. Unused TV channels that are not adjacent to an active TV channel will be open for use by TVBDs, and in the future may be unusable for that reason. For today, where there are few (no?) TVBDs operating they are probably fine.

It is becoming increasingly important that care is taken in choosing frequencies for wireless mics. There is commercial software from PWS, Stage Research, and Kaltman Creations, and probably others, that helps in RF planning by identifying unused TV channels in your zip code, and calculating intermod free frequencies. There are also free versions from Shure, and Sennheiser.

When using more than a couple of wireless mics, it is increasingly important to take the time to find the best RF frequencies you can. There are plenty of tools available to help you do that.

Mac

FYI, when you use the Google Spectrum Database, click "Register Protected Entity", and click "Low Power Auxiliary Stations (Licensed Wireless Microphones)", it simply bounces you to Spectrum Bridge.

I noticed a disturbing quirk when using the system to register under my license for an event in Salt Lake City.  It doesn't allow you to register unoccupied channels that are adjacent to local DTV broadcast channels, because they are supposedly already protected.  However, Portable devices are allowed to operate at 40 mW on those channels adjacent to nearby television channels.  Additionally, months ago, Spectrum Bridge applied for a waiver of FCC rules on behalf of Meld Technologies, to allow their 40mW fixed TVBD video media transmitters to operate on DTV-adjacent channels, and to do so without GPS location requirements.  This is a major flaw in the system.

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