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Kenwood TM-V7A Service Manual

Kenwood TM-V7A
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TM-V7A/E
CIRCUIT
DESCRIPTION
@1C407
(RD
system)
SW
No.
SW
name
Function
0
CTCSS
decoder
input
"L"
:
OFF
"H"
:
RDV
connection
1
CTCSS
decoder
input
“L"
>
OFF
"H"
:
RDU
connection
2
Not
used
(Always
set
to
OFF)
3
|
Notused
(Always
set
to
OFF)
4
MIC
RDV
squelch
control
"L":
CLOSE
"H"
:
BUSY
5
MiC
RDU
squelch
control
"L":
CLOSE
"H"
:
BUSY
6
Not
used
(Always
set
to
OFF)
7
Not
used
(Always
set
to
OFF)
8
MIC
RDV
squelch
control
"L":
CLOSE
"H"
:
BUSY
9
MIC
RDU
squelch
control
"L":
CLOSE
"H"
:
BUSY
10
|
Not
used
(Always
set
to
OFF)
11
_|
Not
used
(Always
set
to
OFF)
Data
Terminal
and
Peripheral
Circuits
J402
(data
terminal)
is
the
data
communications
terminal
on
the
front.
It
handies
transmission
control,
data
input/output,
and
squelch
signals.
There
are
two
data
communications
modes:
9600bps
mode
and
1200bps
mode.
9600bps
mode
communications
are
GMSK
and
G3RUH
packet
communications.
Unlike
with
1200bps
AFSK,
with
this
type
of
high-speed
modulation,
frequency
modulation
is
carried
out
after
the
@Transmission
signals
Transmission
modulation
signals
enter
from
PKD
of
the
data
terminals
(J501).
The
path
to
the
modulation
depends
on
whether
communications
are
9600bps
mode
or
not.
These
paths
are
shown
as
®,
When
PKS
of
the
data
terminais
(J402)
is
low,
the
path
switches
to
®
and
©.
When
PTT
is
active,
the
path
switches
to
©.
The
modulation
input
levels
etc.
are
in
Table
8.
For
9600bps
mode,
the
frequency
shift
depends
on
the
input
signal
level,
so
there
is
an
amplitude
limiting
circuit
to
hold
the
signal
below
4
Vp-p
to
avoid
extreme
shifts.
@Reception
signals
PR9
is
the
9600bps
data
communications
reception
output.
It
outputs
the
FM
detection
circuit
output
(RD
Table7
®,
and
©
in
Figure
12.
SW
No.
sw%
OE
12
|
PTT
BAND
RDV
control
"L"
:
Transmit
band
is
430
"H"
:
Transmit
band
is
144
13.
|
PTT
BAND
RDU
control
“L":
Transmit
band
is
144
"H"
:
Transmit
band
is
430
14
|
Not
used
(Always
set
to
OFF)
15
__|
Not
used
(Always
set
to
OFF)
16
|
DTMF
decoder
input
"L":
OFF
“H"
:
RDV
connection
17
|
DTMF
decoder
input
"L’
:
OFF
"H"
:
RDV
connection
18
{|
Not
used
(Always
set
to
OFF)
19
|
Not
used
(Always
set
to
OFF)
20
Not
used
(Always
set
to
OFF)
21
Not
used
(Always
set
to
OFF)
22
|
DTMF
decoder
switching
"L":
RD
input
input
"H"
;
MIC
input
23
|
DTMF
decoder
switching
"L":
RD
input
input
"H"
:
MIC
input
digital
base band
signals
(rectangular
wave)
are
passed
through
a
band
limiting
filter.
For
9600bps
GMSK
for
example,
compared
to
4800Hz
signals
(nearly
sine
wave
signals
passed
through
a
filter),
these
signals
have
a
hissing
sound
like
digital
modulation
when
listened
to
by
ear.
Different
types
of
modulation,
such
as
GMSK
and
G3RUH,
are
distinguished
by
the
type
of
band
limiting
filter.
The
amplitude
of
the
PKD
signal
from
the
data
terminals
(J402)
is
limited
by
D506
and
D507.
Thanks
to
this
circuit,
the
PKD
signal
does
not
go
above
4
Vp-p
and
the
frequency
shift
does
not
fluctuate
extremely.
Pin
No.
|Pin
name
Specification
bps
switching
1200bps
g600bps
1
PKD
Modulation
input
|
40mVp-p
2Vp-p
Frequency
shift
|
3+0.5kHz
|
2.2+0.5kHz
4
PRe
Output
level
500mVp-p/1
0kQ
|
Always
output
during
reception
Output
level
500mVp-p/10kQ
5
PR1
Not
output
when
squeich
off
signals)
through
a
buffer
amp
(Q506:
2SC4738
(GR)).
These
signals
are
always
output
whether
the
squelch
is
open
or
closed.
Table8
DATA
terminal
input/output
level
PR1
is
the
1200bps
data
communications
reception
output.
It
outputs
the
FM
detection
circuit
output
(RDT
signals)
through
a
buffer
amp
(Q508:
2SC4738
(GR)).
These
signals
are
always
output
whether
the
squelch
is
open
or
closed.
18

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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"
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