REDBACK
®
C 8870C UHF Band Diversity Wireless Mic System
REDBACK
®
C 8870B UHF Band Diversity Wireless Mic System
Page 5
REDBACK
®
UHF Band Diversity Wireless Microphone System
Operation:
(See Fig 1.)
1. Connect the cable, one end to the balanced or unbalanced output jack of the receiver, the other end to
the mic mixing input of amplifier, audio mixer etc.
2. Please set the same frequency (see Table 1 & 2) on the transmitter and receiver. If interference occurs
from an outside source, change the frequency.
3. For best results set the output volume control at three quarter level (3 o'clock position) and
adjust mixer / amplifier level to suit.
4. The squelch level is adjustable by the squelch adjustment at the back of the unit. Adjust
the squelch level to prevent external noise. Note: setting the squelch high (towards max)
will reduce the range of the system.
5. When the receiver is not in use disconnect from mains power.
PLEASE NOTE: There are 2 types of transmitters available, both are compatible with this unit. Series
1 transmitters have a DIP switch for frequency selection. Series 2 transmitters have a rotary switch
for frequency selection. Please refer to table 1 “Frequency cross reference chart” for details.
A maximum number of 6 Redback systems can be used in the one location at the same time. To use the
maximum number of frequencies in the one location at the same time the consult channel guide below.
D C O U T
5
13
1
9
B
Transmitter charging port
C
Power Switch
D
Channel Selector
E
Power Indicator
F
Diversity A.B Indicator
G
RF Level Indicator
H
Volume Control
I
Antenna B
J
Balanced Output
K
Unbalanced Output
L
Squelch Adjustment.
M
DC Socket
N
Antenna A
Fig 1:
Page 2
Ant B
Ant A
B C
F
G
H
I
J
K
L
M
N
D
E
Table 1 : Frequency Cross Reference Chart.
Series 1 Transmitters, DIP Switch
Series 2 Transmitters, Rotary Switch (MHz)
Ch1:
790.375
Ch2:
791.125
Ch3:
792.125
Ch4:
793.250
Ch5:
794.250
Ch6:
795.125
Ch7:
796.250
Ch8:
797.375
Ch9:
798.375
Ch10:
799.875
Ch11:
800.875
Ch12:
801.625
Ch13:
802.750
Ch14:
803.875
Ch15:
804.750
Ch16:
805.375
Use only these channels in the
same location at the same time.
Other channels used together
will not provide interference
free transmission.
Channel 1
Channel 5
Channel 9
Channel 10
Channel 14
Channel 15
Fig 5: Fitting the rack mounting brackets to
the unit.
C 8843
Bracket
C 8842
Booster
To Antenna
(TNC Female)
To Booster
(TNC Female)
Screw adaptor
for mic stand.
Fig 4: An antenna booster is highly recommended for long distance requirements such as in stadiums
and auditoriums. The antenna booster (C 8842) can be wall or mic stand mounted to with an option-
al bracket (C 8843).