Sony WRT-810A Operating Instructions Manual page 3

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The WRT-810A and the WRT-820A are transmitters for an 800 MHz
band UHF synthesized wireless microphone system to be used for
broadcast or movie production purposes. The other system compo-
nents include the AN-820A UHF antenna, the WD-820A UHF antenna
divider, and the WRR-820A/840A UHF synthesized diversity tuner.
The microphones/transmitters and tuners are classified by frequency
band. See the table on the next page.
A 12 MHz frequency band (or two consecutive-numbered TV channels)
is assigned to each microphone/transmitter and tuner model. To
indicate the assigned frequency bands, the parenthesized numbers
following the mode! names in the table show the smaller of the assigned
TV channel numbers. in building up a UHF wireless microphone
system, be sure to combine a microphone/transmiiter and a tuner
having the same TV channel! number.