Kenwood TM-V7A Service Manual

TM-V7A/E
DESCRIPTION OF COMPONENTS
TX-RX UNIT (X57-52XX-XX : A/3)
CONTROL UNIT (X57-52XX-XX : B/3)
Ref No. Use/Function Operation/condition/Compatibility
Qi Power select switch ON for 430MHz reception
Q2 Power select switch ON for 144MHz transmission
Q3 Power select switch ON for main 144MHz reception/ON for 430MHz sub-reception
Q7 Power select switch ON for 430MHz reception
Q8 Speaker output mute ON for internal speaker
Q9 Speaker output mute ON for external speaker
Qi0 Power select switch ON for 430MHz transmission
Qi1 High-frequency amplification Operates for main 144MHz reception
Qiz Buffer 12.8M
Q15 F IN amp 430M
Q16 Power select switch ON for 800MHz reception (Except K type) /ON for main 430MHz reception
Q17 Power select switch ON for 430MHz pass through/ON for 144MHz sub-reception
Q19 Amp 12.8M
Q20 FIN amp 144M
Q21 High-frequency amplification Operates for main 144MHz reception
Q23 High-frequency amplification Operates for main 430MHz reception
Q24, 25 Charge pump 430M
Q26 Filter switch 430MHz sub-reception
Q27 First mixer switch ON for main 144MHz reception
Q28 First mixer Operates for main 144MHz reception
Q29, 30 Charge pump 144M
Q31 First mixer switch ON for 430MHz sub-reception
Q32 First mixer Operates for 430MHz sub-reception
Q33 Modulation muting 430M
Q34 High-frequency amplification Operates for main 430MHz pass through
Q35 Modulation muting 144M
Q36 PLL 8V ripple filter
Q37 High-frequency amplification Operates for main 430MHz reception
Q38 CV line buffer
Q39 First mixer switch ON for 144MHz sub-reception
Q40 First IF amplification
O41 PLL 8V ripple filter
Q42 Power switch For 430M through
Q43 Q40 gain control AM AGC
Q44 First mixer Operates for 144MHz sub-reception
O45 VCO-PLL output amplification 430M
O46 VCO-PLL output amplification 144M
Q47 Main 144M reception power
Q48 First mixer switch ON for main 430MHz reception
Q49 High-frequency amplification Operates for 800MHz reception (Except K type)
Q50 First mixer Operates for main 430MHz reception
Q51 High-frequency amplification Hetero amplification for 800MHz reception (Except K type)
Q52 First mixer Operates for 800MHz reception (Except K type)
Q53 Transmission driver 430M transmission
Q54
First
mixer
switch
ON
for
800MHz
reception
(Except
K
type)
Q55
First
IF
amplification
;
Q56 Transmission driver 144M transmission
Q57 Transmission driver 430M transmission
Q58 Noise amp 144M
Q60 Transmission driver 430M transmission
23

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"