Sony MB-806A Service Manual page 7

Overview
These operating instructions describe the MB-806A
Tuner Base Unit in which the optional WRU-806A
UHF Synthesized Tuner Unit is installed.
The unit is a reliable UHF synthesized diversity tuner
for the 800-MHz-band Sony UHF wireless microphone
system which uses the frequency bands allocated for
UHF TV broadcasting.
This tuner is designed to enable simultaneous use of
multiple channels when channels are selected
according to the channel plan.
Installing six WRU-806A UHF Synthesized Wireless
Tuner Units will enable six-channel operation on the
tuner.
In building up a UHF wireless microphone system, be
sure to combine a microphone/transmitter and a tuner
having the same TV channel number (62 or 69).
CE62 model
A 14 MHz frequency band is assigned to the MB-
806A with WRU-806A (CE62) model, permitting it to
operate on any of 111 receiving frequencies in 125-
kHz steps of Sony original channel plan or 561
receiving frequencies in 25-kHz steps of German User
Group in the range of TV channels 62 and 63.
The selectable wireless channels and frequencies for this
model are listed pages L-3 through L-8.
CE69 model
An 8 MHz frequency band is assigned to the MB-
806A with WRU-806A (CE69) model, permitting it to
operate on any of 64 receiving frequencies in 125-kHz
steps of Sony original channel plan in the range of TV
channel 69 or 14 receiving frequencies in 25-kHz steps
of UK General Use.
The selectable wireless channels and frequencies for this
model are listed on page L-9.
AU66 model
An 14 MHz frequency band is assigned to the MB-
806A with WRU-806A (AU66) model, permitting it to
operate on any of 102 receiving frequencies in 125-
kHz steps of Sony original channel plan in the range of
TV channel 66 and 67.
The selectable wireless channels and frequencies for this
model are listed on pages L-10 and L-11.
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Features
Phase Locked Loop (PLL) synthesized
system
The tuner has a refined phase locked loop (PLL)
synthesizer circuit.
Preprogrammed wireless channel plan for
simultaneous multichannel operation
The tuner has many preprogrammed, easily settable
channels for simultaneous multichannel operation.
Modular multichannel reception
By installing optional WRU-806A UHF Synthesized
Tuner Units, you can receive up to six channels on one
MB-806A unit.
Versatile display
A liquid-crystal display provides a variety of
information, including the levels of the reception
channels, RF information and transmitter battery
alarm.
Space diversity reception system
The tuner provides stable signal reception with
minimum dropout.
Tone squelch circuit for noise elimination
A built-in squelch circuit eliminates noise and signal
interference when the tuner is in signal reception
standby mode.
Compander system
A compander (compressor/expander) system enables
stabilized wireless transmission over a wide dynamic
range.
Rack mounting
The MB-806A can be mounted in an EIA standard 19-
inch rack (1 U size).
System Configuration
The tuner can be used with a Sony UHF synthesized
wireless microphone or UHF synthesized transmitter
among the models listed in the table below.
Sony 800 MHz-band system models
CE62 and CE69 model
Frequency band Model name
TV channel Frequency Transmitter or Tuner
(MHz) microphone
62 800.000 to WRT-805A (62) WRR-805A (62)
814.000
WRT-807A (62) WRR-802A (62)
WRT-822A (62) MB-806A with
WRU-806A(62)
69 854.125 to WRT-805A (69) WRR-805A (69)
862.000 WRT-807A (69) WRR-802A (69)
WRT-822A (69) MB-806A with
WRU-806A(69)
AU66 model
Frequency band Model name
TV channel Frequency Transmitter or Tuner
(MHz) microphone
66 792.250 to
WRT-805A (66) WRR-805A (66)
798.500
WRT-807A (66) WRR-802A (66)
WRT-810A (66)
MB-806A with
WRT-820A (66) WRU-806A (66)
67 799.250 to
WRT-822A (66) WRR-810A (66)
805.500
WRT-830A (66) WRR-820A (66)
WRT-860A (66) WRR-840A (66)
WRR-850A (66)
WRT-867A (66)
WRR-855A (66)
WRR-860A (66)
Channel Plan
The tuner stores several groups of channels. See
"Overview of Channel Plan" in the "Wireless Channel
Lists" section.
Channel groups other than group 00 are designed so
that all channels of one group can be used
simultaneously within the same UHF wireless
microphone system without causing intermodulation.
It is therefore recommended that you usually use a
channel group other than group 00 unless the use of
group 00 is specifically necessary.
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