Kenwood TKR-851 User manual

© 2004-5 PRINTED IN JAPAN
B51-8684-00 (N)987
UHF FM REPEATER
TKR-851
SERVICE MANUAL
UHF FM REPEATER TKR-851
Front panel
(A62-0934-03)
Knob (DC source)
(K29-9106-04)
Key top
(K29-5460-02)
Knob (Volume)
(K29-5389-03)
Modular jack
(E08-0877-05)
Antenna cable (N)
(E30-7528-05)
Antenna cable (BNC)
(E30-3418-05)
TEST/SPKR connector assy
(E37-0913-05)
D-sub cable assy
(E37-0904-05)
DC backup terminal
(E70-0402-05)
DC cord (Ext DC in)
(E30-3414-05)
Fuse (Blade, 10A/32V)
(F06-1032-05) x 2
GENERAL ................................................................. 2
SYSTEM SET-UP ..................................................... 2
OPERATING FEATURES ......................................... 3
REALIGNMENT........................................................ 4
INSTALLATION........................................................ 5
MODIFICATION ....................................................... 8
DISASSEMBLY FOR REPAIR ................................ 10
CIRCUIT DESCRIPTION ......................................... 11
SEMICONDUCTOR DATA ..................................... 18
COMPONENTS DESCRIPTION ............................. 20
PARTS LIST............................................................ 22
EXPLODED VIEW .................................................. 34
PACKING ................................................................ 36
ADJUSTMENT ....................................................... 37
CONTENTS
TERMINAL FUNCTION ......................................... 46
INTERCONNECTION DIAGRAM........................... 50
PC BOARD
FINAL UNIT (X45-3742-71) ............................... 52
DISPLAY UNIT (X54-3330-21) .......................... 56
TX-RX UNIT (X57-6962-70) (A/2)..................... 60
TX-RX UNIT (X57-6962-70) (B/2) ..................... 64
RX VCO UNIT (X58-4800-10) ........................... 68
TX VCO UNIT (X58-4810-10) ............................ 69
SCHEMATIC DIAGRAM ........................................ 70
BLOCK DIAGRAM.................................................. 83
KES-5 (EXTERNAL SPEAKER) .............................. 86
SPECIFICATIONS................................................... 87

54
JIHGBA
1
2
3
4
5
6
7
8
9
10
11
12
13
14
C49
C50
C52
C53
C91 C92 C93 C94 C95 C96 C97
C106
C107
C108
C109
IC1
R51
R52
R53
J72-0911-09 (A/2)
1
34
6
TKR-8
FINAL UNIT (X45-3742-71) Foil side view (J72-0911-09)
Ref. No. Address
IC1 7J
IC2 9O
Q9 8O
D10 8O

TKR-851
87
SPECIFICATIONS (K TYPE)
GENERAL
Frequency Range ................................ 450 to 480MHz
Number of Channels ........................... 16 channel
Channel Spacing ................................. Wide : 25kHz Narrow : 12.5kHz
(PLL channel stepping 5kHz/6.25kHz)
Operating Voltage ............................... 13.6V DC±15% (10.8~15.6V)
Current Drain
Standby .......................................... 0.8A
Standby w/power save .................. 0.3A (Operating mode DC-IN : Backup, FAN : Temp, SAVE : ON, DISP : OFF)
Receive .......................................... 1.2A
Transmit/Receive ........................... Less than 8A
Duty Cycle
Receive .......................................... 100%
Transmit ......................................... 100% (1~25W)
Frequency Stability ............................. Less than ±0.00015% –30°C to +60°C (–22°F to +140°F)
Antenna Impedance ........................... 50Ω
Operating Temperature Range ........... –30°C to +60°C (–22°F to +140°F)
Dimensions ......................................... 483 (19) W x 88 (3-1/2) H x 340 (13-1/3) D mm (inch)
Weight ................................................ 9.7kg (21.4 lbs.)
RECEIVER (Measured by TIA/EIA-603)
Sensitivity
12dB SINAD ................................... 0.35µV (–116dBm)
20dB Quieting ................................ 0.45µV (–114dBm)
Selectivity ........................................... Wide : 83dB (±25kHz) Narrow : 75dB (12.5kHz)
Intermodulation................................... Wide : 78dB (±25kHz/±50kHz) Narrow : 75dB (±12.5kHz/±25kHz)
Hum and Noise ................................... Wide : 50dB Narrow : 45dB
Spurious & Image Rejection ............... 90dB
Audio Output (Ext. Speaker) ............... 4W at 4Ωless than 5% distortion
Audio Distortion (Ext. Speaker) .......... Less than 2.5% at 1000Hz
Band Spread ....................................... 5MHz
TRANSMITTER (Measured by TIA/EIA-603)
RF Power Output ................................ 25W adjustable to 1W (100% duty @1~25W)
Type of Emission ................................ Wide : 16K0F3E Narrow : 11K0F3E
Spurious Response ............................. Harmonics : 80dB Others : 75dB
FM Hum and Noise ............................ Wide : 50dB Narrow : 45dB
Audio Distortion .................................. Less than 3% at 1000Hz
Microphone Impedance...................... 600Ω
Band Spread ....................................... 30MHz

Kenwood TKR-851 Service Manual
Kenwood TKR-851 Service Manual
Kenwood TKR-851 Service Manual
Kenwood TKR-851 Service Manual
Kenwood TKR-851 Service Manual
Kenwood TKR-851 Service Manual
Kenwood TKR-851 Service Manual
Kenwood TKR-851 Service Manual
Kenwood TKR-851 Service Manual