Kenwood TM-V7A Service Manual

TM-V7A/E
24
DESCRIPTION OF COMPONENTS
Ref No. Use/Function Operation/Condition/Compatibility
Q61 Transmission driver 144M reception
Q63 Noise amp 430MHz
Q66, 67 APC control
Q69 Power switch
Q71 Power switch control
Q73 RD buffer 144MHz
Q74 RD buffer 430MHz
Q75 FAN switch
Q76 Constant voltage circuit 10V
Q77 Switch Overvoltage protection
Q78 Constant voltage circuit 10V
Q81 Temperature protection switch
Q91 Switch AM select
Q501 Back up switch
Q504 5C feed switch
Q505 MIC RD buffer amp
Q506 9600bps RD buffer amp
Q507 MIC RD mute
Q508 1200bps RD buffer amp
Q509 Reset switch
IC4 AF amplification
IC2 8V AVR
IC3 VHF band transmission driver
IC4 UHF band transmission driver
IC6 PLL frequency synthesizer 430MHz
IC7 PLL frequency synthesizer 144MHz
IC8 Analog switch 430MH2z Ioop filter switching
Ic9 Analog switch 144MHz loop filter switching
IC10 VCO-PLL
IC11 Frequency divider (prescaler)
IC12 VCO-PLL
IC13 Second local oscillation, mixer, IF amplification, detection,
low-frequency amplification, noise amplification,
noise detection, squelch switching
IC14 Multiplexer
IC15 Second local oscillation, mixer, IF amplification, detection,
low-frequency amplification, noise amplification,
noise detection, squelch switching
IC16 APC conirol
IC17 5V AVR
IC18 Multiplexer
IC19, 20 Serial-parallel conversion
IC501 6V AVR
IC502 5V AVR
1C503 Cross point switch
IC504 Electronic control
IC505 Reset IC
IC506 DTMF decoding
IC507 Mic amp, tone decoding
IC508 MPU
IC509 Analog switch
IC510 Cross point switch

Kenwood TM-V7A Specifications

General Specifications

VHF frequency range	144~148MHz
UHF frequency range	438~450MHz (U.S.A/Canada)
Antenna impedance	50Ω
Usable temperature range	-20°C to +60°C (-4°F to +140°F)
Power supply	13.8V DC ±15% (11.7~15.8V)
Grounding method	Negative-ground
Frequency stability	±3ppm (-10°C to +50°C)
Dimensions (W x H x D)	140 x 54.5 x 205.5 mm

Transmitter Specifications

High power output	50W (VHF) / 35W (UHF)
Mid power output	Approx. 10W
Low power output	Approx. 5W
Spurious emissions	-60dB or less
Maximum frequency deviation	±5kHz
Audio distortion	3% or less (at 60% modulation)
Microphone impedance	600Ω

Receiver Specifications

Circuitry	Double conversion
Intermediate frequency (1st / 2nd)	38.85MHz / 450kHz and 45.05MHz / 455kHz
Sensitivity (VHF or UHF band)	0.16μV or less (12dB SINAD)
Sensitivity (Sub VHF or UHF band)	0.25μV or less
Selectivity (-6dB)	12kHz or more
Selectivity (-60dB)	28kHz or less
Squelch sensitivity	0.1μV or less
Audio output	2W or higher (8 ohms, 5% distortion)
Audio output impedance	8Ω

Weight and Dimensions

Weight	1.2 kg (2.6 lb)
Dimensions (W x H x D)	5.51" x 2.15" x 8.09"