Kenwood TM-V7A Service Manual

TM-V7A/E
DESCRIPTION OF COMPONENTS
Ref No. Use/Function Operation/Condition/Compatibility
IC511 Low frequency amplification
IC512 EEPROM
10513 Multiplexer
Di Voltage compensation
D4,5 Variable capacity diode tuning
D7 For lock detector rectification For 430MHz
Ds Lock detector For144MHz
D9 Filter switch For 430MHz-sub
D10, 11 Variable capacity diode tuning
D12 Loop filter switch For430MHz
D13, 14 Variable capacity diode tuning
D15 High-frequency switch
D16 Loop filter switch For 144MHz
D17 High-frequency switch
D18 Hetero switch
Di9 Constant voltage circuit For frequency divider
D20 Speeds rise of Q36
D21 Hetero switch
D22 High-frequency switch
D23 Speeds rise of Q41
D24 Power switch
D25 ~ 27 Hetero switch
D28 Temperature assurance For 144MHz
D29 Power switch
D30 Temperature assurance For 144MHz
D31 Temperature assurance 430M driver
D32 Noise amp detection For 144MHz
D33, 34 Antenna switch For 430MHz
D35, 36 Antenna switch For 144MHz
D37 APC power detection Operates for 430MHz transmission
D38 Noise amp detection For 430MHz
D39 APC power detection Operates for 430MHz transmission
D40 Transmission control
D41, 42 APC power detection Operates for 144MHz transmission
D43 Power reverse connection protection
D44 ~ 47 Hetero switch
D48 Constant voltage circuit
D49 Switch Overvoltage protection
D50 Antenna switch For 144MHz
D51 Reverse power connection prevention
D52 Antenna switch
D501-505 Backflow prevention
D502 Backup detection
D508 Switch For hardware reset
D509 Power feed For PC control
25

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"