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Kenwood TM-V7A Service Manual

Kenwood TM-V7A
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TM-V7A/E
CIRCUIT
DESCRIPTION
Digital
Control
Circuit
The
digital
control
section
controls
each
function
with
one
microprocessor
(IC508)
and
comprises
the
subtone
signal,
DTMF
encode
and
DTMF
decode
circuit
(IC506),
the
electronic
control
circuit
(IC504),
and
the
analog
signal
select
cross
point
switch
(IC503
and
1C510)
circuit.
The
reset
and
backup
circuits,
mic
amp
circuit,
and
microphone
key
input
circuit
are
also
included
in
the
control
unit.
IC508
78P058GC
SI
Control
panel
Panel
and
Control
Unit
Data
Communications
Figure
7
shows
the
control
unit
data
communication
circuits.
Sl
is
the
serial
data
in
and
SO
is
the
serial
data
out.
There
is
an
inverter
for
protecting
the
microprocessor
board.
Data
communication
is
asynchronous,
with
a
communi-
cations
speed
of
3125
bps.
The
control
unit
side
micro-
processor
checks
the
connection
once
every
0.5
second
and
if
the
connection
is
NG
twice
in
a
row,
in
other
words
if
the
panel
section
is
removed
for
more
than
one
second,
the
power
is
cut
off.
IC4
|
|
pPD78058GC
Panel
surface
Fig.7
Panel,
control
unit
data
communications
circuit
Speaker
Switching
Circuit
There
are
two
speaker
jacks,
J1
and
J2.
The
AF
signals
can
be
output
in
various
combinations
matching
the
internal
speakers.
When
no
external
speaker
is
connected
to
J1,
Pins
10
and
11
of
the
multiplexer
(IC18:
XBU4053BCF)
go
low,
the
AF
signals
AO
0
and
AO
1
from
the
control
unit
are
added
and
input
to
the
power
amp
(IC1:
LA4446).
When
an
external
speaker
is
connected
to
J1,
Pins
10
and
11
of
the
multiplexer
(1C18)
go
high
and
AO
0
and
AO
1
are
input
separately
to
the
power
amp.
The
AF
signal
output
combinations
are
as
in
the
speaker
combination
cable
on
the
right.
AOO
AO1
Internal
speaker
external
speaker
Internal
speaker
|
external
speaker
external
speaker
|
external
speaker
Internal
speakers
only
1
external
speaker
(J2)
1
external
speaker
(J1)
2
external
speaker
Speaker
combination
table
ICt
POWER
AMP
Ri2
R10
AO1
AN
AN
u
I>
8
1C18
a
o
15]
8
A
°
1
|
[40
12
R14
14
RQ
_
AAA
AOO
Wr
“TS
13
w—?
hM_{8
A
11
~
fem
Dé
f.
KHKH-+
PNA
2s
c>
7
Fig.8
Speaker
switching
circuit

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Kenwood TM-V7A Specifications

General Specifications IconGeneral Specifications
VHF frequency range144~148MHz
UHF frequency range438~450MHz (U.S.A/Canada)
Antenna impedance50Ω
Usable temperature range-20°C to +60°C (-4°F to +140°F)
Power supply13.8V DC ±15% (11.7~15.8V)
Grounding methodNegative-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 IconTransmitter Specifications
High power output50W (VHF) / 35W (UHF)
Mid power outputApprox. 10W
Low power outputApprox. 5W
Spurious emissions-60dB or less
Maximum frequency deviation±5kHz
Audio distortion3% or less (at 60% modulation)
Microphone impedance600Ω
Receiver Specifications IconReceiver Specifications
CircuitryDouble 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 sensitivity0.1μV or less
Audio output2W or higher (8 ohms, 5% distortion)
Audio output impedance8Ω
Weight and Dimensions IconWeight and Dimensions
Weight1.2 kg (2.6 lb)
Dimensions (W x H x D)5.51" x 2.15" x 8.09"
View in Manual

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