Name: Kenwood TM-V7A
Brand: Kenwood
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M-V7A/E

CIRCUIT

DESCRIPTION

144MHz

Band

Transmit

Circuit

@Outline

The

transmitter

directly

oscillates

the

target

frequency

and

directly

frequency

modulation

applied

with

variable-

capacity

diode.

@Modulation

circuit

the

control

unit,

the

audio

signals

are

amplified

and

limited

and

passed

through

splatter

filter,

then

mixed

with

subtones

from

the

microprocessor,

and

directly

frequency

modulated

VCO

(IC

10)

with

variable-capacity

diode.

@yYounger

stage

circuit

The

signals

from

the

PLL

unit

are

input.

the

drive

circuit.

Q56

and

Q61

carry

out

stable

amplification

over

broad

band

without

regulation

and

can

obtain.

adequate

output

drive

the

final

module.

@APC

circuit

The

automatic

transmission

output

control

circuit

(APC)

uses

differential

amplfier

circuit

(1C16)

compare

and

amplify

the

reference

voltage

that

forms

the

CPU

PWM

output

and

the

voltage

that

detects

part

the

trans-

mission

power

with

diodes

(VHF:

D41

and

D42;

UHF:

D37

and

D39)

and

for

that

output

controls

the

voltage

with

preamp

(Q67)

and

control

transistor

(Q66)

and

holds

the

transmission

output

constant.

ANT

430MHz

Band

Transmit

Circuit

@Outline

The

transmitter

directly

oscillates.

the

target

frequency

and

directly

frequency

modulation

applied

with

variable-

capacity

diode.

@Modulation

circuit

the

control

unit,

the

audio

signals

are

amplified

and

limited

and

passed

through

splatter

filter,

then

mixed

with

subtones

from

the

microprocessor,

and

directly

frequency

modulated

VCO

(iC

12)

with

variable-capacity

diode.

@Younger

stage

circuit

The

signals

from

the

PLL

unit

are

input

the

drive

circuit.

Q53,

Q57,

and

Q60

carry

out

stable

amplification

over

broad

band

without.

regulation

and

can

obtain

adequate

output

drive

the

final

module.

Six

sets

PWM

data,

high-,

medium-,

and

low-power

each

for

VHF

and

UHF

are

stored

into

EEPROM

memory

(IC512)

and

for

each

power

condition,

the

data

extracted

from

the

EEPROM

control

the

power.

VHF

UHF

Final

amp

LPF LPF

Final

amp

Ic3

‘

Ica

DBA

PWR

D41

PWR

D37

DET

D42

DET

|D39

IC512

;

E2PROM

Waveform

filter

Comparative

amplitication

Circuit

1C16

Preamp

967

Control

|Q66

transistor

IC508

CPU

Reference

voltage

PWM

output

(JULIUL)(

SUT)

Fig.2

APC

circuit

Other manuals for Kenwood TM-V7A

Instruction Manual100 pages

Questions and Answers:

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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