Kenwood TR-8400 Service Manual

TR-8400
[K, X type]
GENERAL
Semiconductors................. MPU 1
ICs 13
Transistors 52
FETs 6
Diodes 74 (K), 76 (X)
Frequency range ................ 440.000 to 449.975 MHz (K)
430.000 to 439.975 MHz (xX)
Digital control, phase locked VCO
.. PM (F3)
Frequency synthesizer
Mode...
Antenna impedance ........... 50 ohms
Power requirement ........... 13.8V0C +15%
Grounding ......0..00....... .. Negative
Operating temperature .......
Current drain ooo...
—20°C to + 50°C
0.45A in receive mode with no
input signal
3.44 in HI transmit mode {Approx.)
1 4A in LOW transmit mode
(Approx.)
Less than 3 mA for memory back up
(from power supply)
147.5 mm (5 — 13/16") wide
51.5 mm (2") high
193.0 mm (7 ~ 5/8") deep
(projections excluded)
TRANSMITTER SECTION
RF output power (at 13.8V,
Dimensions 0...
DC, S02 toad) H] 10 Watts min.
; LOW 1 Watts approx. (Adjustable)
Modulation 20...
Variable reactance direct shift
Frequency tolerance
(—20°C ~ +§0°C)
Spurious radiation.............. HI
Less than —60d8
LOW Less than — 50 dB
Maximum frequency deviation
Gast saat Less than +15 x 1076
DWN. switches, 5000
UHF FM CAR TRANSCEIVER
SPECIFICATIONS
[W, T type]
GENERAL
Semiconductors............ MPU 1
ICs 13
Transistors 54 (W), 53 (T)
FETs 6
Diodes 80 (W). 79 (T)
Frequency range ........... 430.000 to 439.975 MHz
Frequency synthesizer... Digital control phase locked VCO
Mode... FM (F3)
Antenna impedance ...... 50 ohms
Power requirement....... 13.8V DC +15%
Grounding |... Negative
Operating temperature.. — 20°C to + 50°C
Current drain ..... 0.454 in receive mode with no
input signal ;
3.4A in HI transmit mode (Approx.)
1.44 in LOW transmit mode
(Approx.}
Less than 3 mA for memory back up
(from power supply)
Dimensions .................. 147.5 mm (5 — 13/16") wide
51.5 mm (2") high
193.0 mm (7 ~— 5/8") deep
_ {projections excluded)
Weight ......0...0000000000.0. 1.5 kg (3.3 Ibs) (approx.)
TRANSMITTER SECTION
RF cutput power (at 13.8V
DC, 500 load} 0. Hi 10 Watts min.
LOW 1 Watts approx. (Adjustable)
Modulation «2.0000... Variable reactance direct shift
Frequency tolerance........... Less than +15 x 1076
(—20°C ~ +50°C)
Spurious radiation.............. HI Less than —60dB
LOW Less than — 50 dB
Maximum frequency deviation
(FM)... +5 kHz
RPT. Tone frequency (W) ... 1,750 Hz
RPT. Tone burst frequency
CT) b a c t r t a teu Dann 28 cee eae Sane 1,750 Hz
Microphone ....................... Dynamic microphone with PTT, UP.
DWN switches, 500 Q
RECEIVER SECTION
Circuitry 0.0... ee Double conversion superheterodyne
Intermediate frequency ...... Ist IF 21.6 MHz
2nd IF 455 kHz
Receiver sensitivity ........... Better than 1 nV for 30 dB S/N
Better than 0.4 uV for 12 dB SINAD
Receiver selectivity ............ More than 14 kHz (—6 dB)
Less than 30 kHz (—60 dB)
Spurious response.............. Better than 60 dB
.... 0.35 nV (threshold)
.. More than 2.0 watts across 8 ohm
load (10% dist)
Note: Circuit and ratings are suject to change without notice due to
developments in technology
Squalch sensitivity ...
Audio output