Kenwood TS-790A User manual

GOO/ANAD
ALLMODE TRIBANDER
TS-790A
TS-790E
INSTRUCTION MANUAL
KENWOOD CORPORATION
PRINTED IN JAPAN B50-8254-30(K, M, M2, T, WH(MC)
96N2110987654321 95121 10987

Thank you for purchasing this new transceiver.
IMPORTANT: =
Please read this Instruction Manual carefully before
placing the transceiver in service.
SAVE THIS INSTRUCTION MANUAL.
The following explicit definitions apply in this manual:
Note : If disregarded, inconvenience only, no risk
of equipment damage or personal injury.
: Equipment damage may occur, but not
personal injury.
Caution
This
Instruction
Manual
covers
the
following
|
models:
TS-790A:All
Mode
Tribander
i
{U.S.A.
and
general
markets)
|
TS-790E:
All
Mode
Tribander
|
(U.K.
and
European
markets)
|
Illustrations show the TS-790A.
CONTENTS
2-1. SPECIFICATIONS ...
2-2. ACCESSORIES
3. INSTALLATION AND CONNECTION ....
3-1. INSTALLATION
3-2. CONNECTION
4. OPERATION
4-1. OPERATING CONTROLS .
4-2. RECEIVER OPERATION....
4-3. TRANSMITTER OPERATION
4-4. MEMORY....
4-5. SCAN
4-6. REPEATER OPERATION.
4-7. TONE SQUELCH (CTCSS)
4-8. TRACE FUNCTION.........008
4-9. SATELLITE COMMUNICATIONS
4-10. DATA COMMUNICATIONS .....
4-11, OPERATION WITH A PERSONAL
COMPUTER
4-12. VOICE SYNTHESIZER .. .
4-13, 1200MHz IF CONNECTOR AND ACCA
CONNECTOR ....cccsceseesereeeeteeeeeeteeeeseeee 48
DHADOAHEAAW
5. BLOCK DIAGRAM AND CIRCUIT DIAGRAM..49
5-1. BLOCK DIAGRAM
6-1.
6-2. SERVICE ............
6-3. CLEANING...
6-4. IN CASE OF DIFFICULTY..
6-5. ORDERING SPARE PARTS
6-6. ADJUSTMENTS
7. OPTIONAL ACCESSORIES .............:cceeereee 66
7-1. VS-2 VOICE SYNTHESIZER
INSTALLATION. . 220.00. 2cccectessanceceitieece es 66
7-2. TSU-5 PROGRAMMABLE TONE
DECODER UNIT INSTALLATION............ 66
7-3. UT-10 1200MHz UNIT INSTALLATION ..67
7-4. OTHER ACCESSORIES... eeeeeeeees 69
8. REFERENCE

1.
Ay
WARNING
|
BEFORE
OPERATION
TO
PREVENT
ELECTRIC
SHOCK,
FIRE
AND
OTHER
INJURY.
PLEASE
NOTE
THE
FOL-
LOWINGS:
Do
not
place
this
unit,
where
it
will
be
exposed
to
Do
not
drop
pieces
of
metal,
needles,
coins
and
other
direct
sunlight
or
close
to
heating
appliances.
electrically
conductive
materials
into
the
unit.
Do
not
touch
the
power
plug,
when
your
hands
are
wet.
To
ensure
good
ventilation,
do
not
put
anything
on
top
of
the
cabinet
and
allow
at
feast
15
cm
(6
inches)
Do
not
puil
the
power
cord,
when
disconnecting
it
of
space
behind
the
unit.
from
the
AC
wail
outlet.
Grasp
the
plug
and
ensure
that
your
fingers
do
not
touch
the
live
pins.
Do
not
place
the
unit
in
areas
of
excessive
dust,
high
humidity
or
on
unstable
surfaces.
If
an
abnormal
odor
or
smoke
is
detected,
immediately
turn
the
power
off
and
pull
out
the
power
plug.
Con-
tact
the
KENWOOD
service
station
or
your
dealer.
BENwaCe
To
avoid
risk
of
electric
shock,
under
no
circum-
stances
should
the
unit
be
opened:
CLEANING
1.
Turn
the
power
off,
before
cleaning
the
unit.
2.
Do
not
use
any
type
of
abrasive
pad,
thinner,
ben-
zine
or
any
substances
which
may
damage
the
unit.
3.
Wipe
the
front
panel
and
other
exterior
surfaces
of
the
unit
with
a
soft
dry
cloth
or
a
soft
cloth
lightly
moistened
with
water.

SPECIFICATIONS
AND
ACCESSORIES
2-1. SPECIFICATIONS
— Model i? I :
Specifications TS-790A TS-790E
2
m
band
ae
144~148
MHz
144~146
MHz
|
Frequency
range
___70
cm
band
430~450
MHz*1
|
430~440
MHz
|
tn,
23
cm
band
____
1240
~
1300
MHz
(Option)
_Mode
_
2.5
J3E
(LSB,
USB),
A1A
(CW),
F3E
{FM}
|
'
Antenna
impedance
50
ohms
-
Power
requirement
7
13.8
VDC
+15%
i
j
=
Grounding
-
et
Negative
~
3
Receive
made
with
no
input
signal
2.54
a
c
=
pa
ae
|
| Current drain 2m band ae 128 =e |
Transmit
mode
70
cm
band
15A
|
i t 23cmband BA
Operating
temperature
-
?
-10
to
+50°C
(+14
to
+122°F}
| Frequency stability (Except FM mode} Less than +3 PPM .
arn pete 342x134x 369mm __
Dimensions (Wx H x D) (Projections eluded) _— (13-15/32” x 59/32" x 14-17/32”)
| __. Weight fe 9.2 kg (20.2 Ibs}
LSB-USB 35 W
i 2 m band SE See eta a
! FM-CW 45 Ww i
f—___ eee ree
Output power i LSB-USB 30 W
| one 70 cm band aes —-
|
:
FMCW
40
W
'
| 23 cm band LSB, USB, CW.FM | 10 W
2: ; ' LSB, USB ' Balanced modulation
&: Modulation :
= FM j Reactance modulation
2 pi ae 2 m/70 cm band Less than — 60 dB
© Spurious radiation
: 23 cm band i Less than —50 dB
; Carrier suppression i More than 40 dB (with 1.5 kHz reference)
Unwanted sideband suppression | More than 40 dB (with 1.5 kHz reference)
: Maximum frequency deviation (FM) +5 kHz
Frequency response (—6 dB) (SSB mode only} ns ee ol ape 400 to 2600 Hz 2
; Microphone impedance 600 ohms
LSB-USB-CW Single conversion superheterodyne
2m band i : as
i FM Double conversion superheterodyne
| LSB-USB-CW Double conversion superheterodyne
i Circuitry 70 cm band - - eae
FM Triple conversion superheterodyne
LSB-USB-CW Triple conversion superheterodyne
i 23 cm band 2 ae ate :
FM Quadruple conversion superheteradyne- ;
MAIN j
ls
1st
IF
2nd
IF
3rd
IF
ath
iF
! eee =e
18
[2m
band
10.685
MHz
|
*
455
kHz
-
=
Lo L xi RSS =i ae ee |
ie 70 cm band 75.925 MHz | 10.695MHz © * 455 kHz | pee
| | 23 cm band 287.175 MHz 41.415 MHz 10.695 MHz | * 455 kHz |
Intermediate |
frequency SUB RX |
1 st IF 2nd IF ad iF) Ath IF
| 2m band 10.595 MHz | * 455 kHz | s =
70cm band |. 75.925 MHz 10.595 MHz | * 455 kHz = !
23 cm band | 287.075 MHz | 41.315 MHz 10.595 MHz * 455 kHz
* : FM only
4

LSB,
USB,
CW
2mband
‘lla
Less than
0.16
nV
)
oe
hi
|
70
em
band
;
~
Less
than
0.16
nV
Sensitivity
i
23
cm
band
;
Less
than
0.16
wv
2
m
band
;
Less
than
0.22
pV
Shan”
a8
70
cm
band
ee
Less
than
0.22
»V
“
Ee
23
cm
band
Less than
0.22
uV
iss,
USB
—6
dB:2.1
kHz,
—60
dB:
4.8
kHz
Selectivity
FM
~6
dB:12
kHz
,
60
dB:
24
kHz
3
;
cw
___
=
8
dB:500
Hz
,
~
50
dB:
2
kHz
‘s
2m
band
.
_____
More
than
65
dB
;
j
e
_
Image
ratio
|
70
cm
band
;
More
than
60
dB
|
}
|
23
cm
band
7
More
than
55
dB
]
|
IF
SHIFT
variable
range
7
More
than
+0.9
kHz
RIT
variable
range
eel
adc
beceantes
Lee
me
ae
FM
-
+9,9
kHz
ae
LSB,
USB,
CW
~~
Less
than
0.20
zV
;
Squeich
sensitivity
oes
ci
;
_
FM
-
Less
than
0.16
pV
Output
1.5
W
across
8
ohms
load
(10%
distortion)
“Output
load
impedance
:
-
i
a
8
‘ohms
:
:
Notes:
—
1.
*1:
Frequency
range
for
M2
type
is
480
~
440
MHz.
2.
Circuit
and
ratings
are
subject
to
change
without
notice
due
to
advancements
in
technology.
2-2. ACCESSORIES
Unpack
your
TS-790A/790E
carefully
and
confirm
that
it
is
supplied
with
the
following
accessories.
Dynamic
microphone...
.+.-191-0352-15...
.1
ea.
DIN
plug
(7-pin)
....
.«-E07-0751-05...
1
ea.
DIN
plug
(13-pin)
.....
---EO7-1351-05...
1
ea,
DC
power
cable
assembly.
-E30-2065-05
«1
ea.
Fuse
(15A)
-FO5-1531-05
7
ea.
Connector
cabie
for
the
Tone
unit
(Except
U.K.
and
Europe
version)
...£E31-3453-05
.1
ea.
Control
location
sticker
B42-3314-04...
1
ea.
External
control
Instruction
Manual
.
-...B50-8262-XX
....
...1
copy
Instruction
Manual
..0.........ccceeeeseee
-BS0-8254-XX
..
-1
copy
Warranty
card
(U.S.A.
and
Europe
version
Only)
...........::ccesecssseessececeeseccceccecceesensauseseeavaseccussecsees
1
ea.
After unpacking
Shipping container:
Save
the
boxes
and
packing
in
the
event
your
unit
needs
to
be
transported
for
remote
operation,
maintenance,
or
service.

3.
INSTALLATION
AND
CONNECTION
3-1. INSTALLATION
FRONT
FEET
=
By
extending
the
front
feet,
the
front
panel
can
be
|
|
elevated
for
operating
convenience.
:
|
Turn
the
front
feet
left
and
pull
down.
Wis
Then
turn
right
to
lock.
s
8
Front feet extension
3-2. CONNECTION
The
TS-790A/790E
requires
more
than
154
at
13.8
VDC
when
transmitting
at
full
power.
Use
the
PS-31
power
supply
for
fixed
station
operation.
A. Rear Panel
oF
Option
To 430/440
MHz antenna
To 144 MHz antenna
To AC outlet
Sepa

(1) Antenna
Caution: on
Protect
your
equipment—Use
a
LIGHTING
AR-
RESTER.
The
type
of
antenna
that
is
used
will
greatly
affect
the
performance
of
the
transceiver.
Use
a
properly
ad-
justed
antenna,
of
good
quality,
to
enable
your
trans-
ceiver
to
perform
at
its
best.
The
antenna
input
impedance
is
50
ohms.
Use
50-ohm
coaxial
cable
such
as
5D-2V
for
this
connection.
If
the
antenna
is
far
from
the
transceiver
the
use
of
low
loss
coaxial
cable,
such
as
5D-2V
is
recommended.
Match
the
im-
pedance
of
the
coaxial
cable
and
that
of
the
antenna
so
that
the
SWR
is
less
than
1.5
to
1.
The
protection
circuit
in
the
transceiver
will
activate
if
the
SWR
is
particularly
poor
(greater
than
3
to
1).
High
SWR
value
will
cause
transmitter
output
to
drop,
and
may
lead
to
TVI
or
BCI
reports.
(2) Grounding
Caution: ~ -
Never
use
a
gas
pipe
or
electrical
conduit
pipe.
Notes:
—
1.
A
ground
connection
that
is
a
1/4
wavelength
or
its
multiple
may
provide
a
good
DC
ground,
but
it
will
not
provide
a
good
RF
ground.
2.
A
city
water
pipe
cannot
be
used
as
a
good
earth
in
some
cases.
Making
a
good
earth
connection
is
important
for
preventing
dangers
such
as
electric
shock
and
for
emitting
a
high
quality
signal
with
minimum
spurious
radiation.
Bury
a
commercially
available
ground
rod
or
copper
plate
under
the
ground
and
connect
it
to
the
GND
terminal.
A
thick
wire,
cut
as
short
as
possible,
should
be
used
for
the
connection.
To
make
a
good
earth
connection,
connect
the
GND
terminal
to
a
grounded
metal
water
pipe.
(3) External speaker
The
TS-790A/790E
includes
a
built-in
speaker.
If
you
would
like
to
use
an
external
speaker,
such
as
the
SP-31,
it
may
be
connected
to
the
EXT
SP
jack
on
the
rear
of
the
radio.
The
speaker
may
be
any
good
8
ohm
permanent
magnet
type
speaker.
The
diameter
should
be
at
least
4
inches
for
good
audio
quality.
If
you
plan
on
using
a
speaker
other
than
the
SP-31
it
should
be
equipped
with
a
miniature
phone
jack
plug.
(diameter
3.5
mm)
(4) Key connection
Your
key
should
be
connected
as
illustrated
in
the
figure
below.
When
using
an
electronic
keyer,
make
sure
that
polarity
is
set
for
positive.
Always
use
shieid-
ed
line
from
the
key
to
transceiver.
(diameter
3.5
mm
Before connection, check that the
polarity is correct. The KEY jack pro-
vides +5.5 V. Use shielded cabie,
Key connection
B. Front Panel
Microphones
{1} Headphones
Any
low-impedance
(4-16
ohms)
headphones
may
be
used
with
the
transceiver.
Connect
the
headphones
to
the
front
panel
phone
jack,
(diameter
6.0
mm).
The
optional
HS-5
or
HS-6
headphones
are
best
suited
for
use
with
the
transceiver.
Stereo
type
headphones
can
also
be
used.
{2) Microphones
Any
microphone
with
an
impedance
between
6000
may
be
used
with
this
transceiver.
The
KENWOOD
microphones
MC-43S
(handheld),
MC-60A,
MC-80,
MC-85
(table-top
type)
are
recommended.
(3) Voice Controller
We
recommend
the
use
of
VOX-4,
if
voice
operated
keying
is
desired.
Simply
connect
the
MIC
cable
of
the
VOX-4 to the MIC jack.

4. OPERATION
4-1. OPERATING CONTROLS
4-1-1. Front Pane!
Wy SoS “a |
EOE
ee : emai a
tg; eoo
ton
ooo
lpg
illo]
oe com
Os S el *
@ POWER switch
Press to turn the power ON or OFF.
(2) Meter
During
receive
the
meter
is
used
as
an
S-meter.
Dur-
ing
transmit
the
function
of
the
meter
is
controlled
by
the
Meter
switch
@,
and
provides
either
ALC
tevel,
or
RF
(power)
readings.
(@) MODE keys
These
keys
are
used
to
select
the
desired
mode
of
operation.
In
CW
mode
the
CW/N
key
is
also
used
to
select
the
desired
filter
bandwidth.
When
a
MODE
key
is
pressed
the
first
character
of
that
mode
will
be
sounded
in
Morse
cade
thru
the
internal
speaker.
This
announcement
can
be
inhibited
by
following
the
in-
structions
in
Section
4-2-5.
FM/AUTO
key:
Press
the
FM/AUTOQ
key
to
alternate
between
FM
and
AUTO
made.
(Please
refer
to
Section
4-2-4.)
USB/LSB
key
:
Press
the
USB/LSB
key
to
alternate
between
USB
and
LSB.
CW/N key : Press the CW/N key to alternate be-
tween CW (SSB filter} and N
{narrow}.
@ Indicators
ON AIR : Lights during transmit.
MAIN BUSY: On whenever the squeich is open.
F, LOCK : Light when the F. LOCK switch is
ON.
SUB BUSY : On whenever the squelch is open.
ALT : Lights when the 1200 ALT switch
is ON. {1200 MHz FM only)
©) MAIN Display Panel
The fluorescent display tube displays operational in-
formation such as the operating frequency, memory
channel information, and RIT information. (See page
16.)

©) MAIN/SUB indicators
MAIN:
Lights
when
the
MAIN
key
is
ON.
SUB __: Lights when the SUB key is ON.
@ FUNCTION keys
MAIN
:
Used
to
set
MAIN
frequency
and
mode.
SUB
:
Used
to
set
SUB
frequency
and
mode.
A/B
:
Selects
VFO
A
or
VFO
B.
VFO/M
:
Used
to
switch
between
memory
or
VFO
operations.
MAIN ®@ SUB: Used to exchange data between the
MAIN band and the SUB band.
A=B_ : Equalizes the frequencies and modes of
VFO A and VFO B.
SUB RX Display Panel
The LCD Provides operational information such as the
operating frequency and memory channel information.
(See page 17.)
@) [MAIN] MUTE switch
Used to attenuate the MAIN audio by 12 dB. When
turned on, the indicator on the right of the switch will
turn red. When off, indicator is green if an incoming
signal is present that opens the squelch. (See 6-6-3,
MAIN audio mute control.)
Caution: Se ee
The indicator will not light when a signal is weak or
absent.
RIT switch
Press to turn the RIT ON or OFF. (MAIN band only)

@) AGC FAST switch
This
switch
selects
the
operating
time
constant
of
the
AGC
(Automatic
Gain
Control)
circuit,
When
the
AGC
switch
is
set
to
SLOW
(
I
),
the
receiver
gain
and
S-
meter
readings
will
react
slowly
to
large
input
changes,
and
when
set
to
FAST
(
=
),
the
receiver
gain
and
S-meter
will
react
quickly
to
changes
in
the
input
signal
level.
The
normal
position
when
using
all
modes
is
the
SLOW
position.
When
working
any
of
the
following
you
might
wish
to
use
the
FAST
position.
* When tuning.
*
When
receiving
weak
signals.
*
When
a
high-speed
CW
signal
is
being
received.
Note:
—
~
2
=
-
This
switch
is
disabled
during
FM
Operations.
@ NB switch
For
pulse
type
noise,
such
as
generated
by
automo-
tive
ignition
systems,
turn
the
NB
switch
ON.
When
pulsating
noise,
such
as
that
caused
by
automo-
bile
ignitions
is
encountered,
place
the
NB
switch
ON.
This
switch
will
not
help
to
eliminate
atmospheric
or
line
noises,
only
pulse
type
noise.
Note:
-
-
-
This
switch
is
disabled
during
FM
operations.
@® [SUB] MUTE switch
Used
to
attenuate
the
SUB
audio
by
12
dB.
When
turned
on,
the
indicator
on
the
left
of
the
switch
will
turn
red.
When
off,
indicator
is
green
if
an
incoming
signal
is
present
that
opens
the
squelch.
(See
6-6-2,
SUB
audio
mute
control.)
Caution: - oo ee =
The indicator will not light when a signal is weak or
absent.
@ [SUB] AF gain control
Turn the knob to increase or decrease the volume.
Clockwise rotation increases the volume and counter-
clockwise rotation decreases the volume.
Note: - wan ~
The output level of the “‘Beep’’ is not affected by the
setting of the AF gain control.