REDBACK
®
C 8870B UHF Band Diversity Wireless Mic System
REDBACK
®
C 8870C UHF Band Diversity Wireless Mic System
Page 6
REDBACK
®
UHF Band Diversity Wireless Microphone System
Congratulations on purchasing a REDBACK PLL Synthesized True Diversity Wireless Microphone
System. The PLL synthesized true diversity wireless microphone system operates on UHF frequency
band. 790~806MHz with 16 selectable channels. Please read this instruction manual completely before
operating the system. These instructions cover the transmitters, plus receiver model C 8870C
System Features:
• Operates on UHF frequency band range 790-806MHz.
• PLL (Phase Locked Loop) synthesized wireless microphone system with 16 selectable frequencies
making it easy to choose interference free channels.
• Excellent reception system ensures super high sensitivity.
• Units are supplied with SMT assembled PCB modules ensuring high reliability, and easy serviceability.
• High signal-noise ratio, high sensitivity & wide dynamic range.
Receiver Features:
• 12V-18V DC Power Supply (supplied)
• Easy rotary switch selection of frequencies all hidden from users view.
• 1/2 19” size case with power & RF indicators. Rack Ears available for
mounting one or two systems into 19” rack equipment.
• Removable aerials making the unit suitable for portable or fixed installations. Aerials are fitted with
TNC connectors.
• Includes in-built power supply for C 8842 antenna booster.
Receiver Specifications:
Carrier Frequency Range:
..............................
UHF band 790~806MHz
Frequency Stability:
........................................
±0.005% with PLL synthesized controlled
S/N Ratio:
..........................................................
at 8dB/µV over 80dB
Image and Spurious Rejection:
....................
80 dB minimum.
Receiving Sensitivity:
....................................
8 dB/µV, at 80 dB S/N ratio.
Selectivity:
........................................................
More than 50dB
Dynamic Range:
..............................................
More than 96dB
Modulation Mode:
..........................................
FM.
IF Frequency:
....................................................
1ST : 56MHz 2ND: 10.7MHz
Service Area:
....................................................
Over 50 metres
AF Response:
....................................................
50Hz to 15KHz(±3dB)
T.H.D.:
..............................................................
Less than 1% (at 1KHz)
Receiver Audio Output:
................................
Unbalanced: max. 1000mV (0dB=1V) at 5K
Ω
Load.
Balanced: max. 100mV at 660
Ω
Load.
Receiver Power Supply:
................................
DC 12-18V Adapter
Note:
TWO OR MORE WIRELESS MICROPHONES (HANDHELD AND/OR LAVALIER)
WHICH TRANSMIT AT THE SAME FREQUENCY CAN NOT BE USED IN THE SAME
LOCATION.
DESIGN AND SPECIFICATIONS SUBJECT TO BE CHANGED WITHOUT NOTICE.
PRECAUTIONS:
* AVOID EXTREMELY DIRTY OR DUSTY ENVIRONMENTS.
* AVOID AREAS WHERE THERE IS EXTREMELY HIGH HUMIDITY.
Page 1
3 Pin XLR Lead
AMPLIFIER
SPEAKER
Mic IN
Line IN
AUDIO MIXER
WIRELESS
RECEIVER
Line OUT
6.3mm Stereo Jack Lead
AMPLIFIER
SPEAKER
Mic IN
Line IN
AUDIO MIXER
WIRELESS
RECEIVER
Line OUT
Fig 6. Wireless Receiver Connection Via Mic In
Fig 7. Wireless Receiver Connection Via Line In
or
OP
E
N
D C O U T
13
9
5
1
Fig 8: Connecting the transmitters to the charging circuit
IMPORTANT NOTE:
DO NOT CONNECT THE CHARGER CABLE
WHEN USING NON-RECHARGEABLE (DRY
CELL / ALKALINE) BATTERIES IN THE
TRANSMITTER.
