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The PTX-3 transmitter and PRC-2 receiver wireless IFB system is currently offered in four different frequency bands or blocks in the North American TV spectrum. The Block numbers and the corresponding frequencies are shown in the chart below:

Blocks 23, 24, 25,26,27 are not legal to operate in the US on the PTX-3 wireless transmitter as of July 2020.

Solution Finder > Wireless: What are the PTX-3/PRC-2 frequency bands currently offered? > image2020-10-29_15-7-53.png

Visit the Clear-Com web site for details of the PTX / PRC-2 Wireless IFB system

http://www.clearcom.com/product/wireless/ifb-wireless