Kenwood TR-7950 User manual

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NTRODUCTON
ar he
v or of our latest product, the new TR795O (or TR793O) transcewer Please read this
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mar ua ca efully before plamng your transceiver in service. The unit has been carefully engineered
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rig d quality standards, and should give you saosfactory and dependable operaOon for
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s r p k g i he event your unit needs to be transported for remote operation, mainten
arce o S v
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ONTENST
1 2
Mobile Installati n [general]
6
1 3 Fixed Sta ion Ins allation 7
1 4
Mer ory ack up th'um Battery
8
SECTION 2. CONTW S AND TERMINALS
2.
rortPaie 9
22 RearParel
11
SE TION3 OPE ATON
3 1 BEFORE OPERA ION
12
32 SQUE CH
12
33 MEMORY NP 12
34 C ANGIN MEMOPYFREQUENCIES. . 12
35 SCA'4 PERATON
12
36 SCANST P.
. ...
13
37 SCAN LO OUT OPERATION
... 13
8
PR OR TV HA'JNL SELECT
13
39 PRIOR TYOPER SWITCH
...... 13
3
,'djTO'r * Cr
PEqATION.
13
3.1 TIVEROP RATEDSCAN
13
12 AUTOPATCH SIDETONE
ANDBEEP RLEVELADJUSTMENT,
13
3 P I EDCH N'JELS
.. 14
314 TU79( P1 )INSTALLATION
....... 14
"ECTION 4 A D tONAL INFORMATION
15
SEC ION
0 TIO A A CESSORIES
... 16
EM . 17, 18
CI
M lCD
M
19
K AGRW .
20
ACCESSORIES
Carefully unpack your TR-7950 (or TR-7930) and check
that it is
supplied with
the following accessories.
(1)
Dynamic microphone (with U/D switch)
(T9i-03i3-05)
..... 1 piece
(2) Mounting Bracket
Mounting parts:
Hex wrench (wOI-0401-04)
I piece
Nuts (5 mm diameter)
(Ni 4-0510-04)
......
4 pieces
Hex-socket screw
(N09-0008-04)..
. 4 pieces
Flat washers (6 mm diameter)
(Ni 5-1060-46) ..
,.........
4 pieces
Spring washer (6 mm diameter)
(NI 6-0060-46)..........
4 pieces
(3) Foot
Rubber foot (small, rear)
(J02-0069-05)
......
2 pieces
Rubber foot (large, front)
(J02-0070-05)
..................... 2 pieces
Screw (N30-3006-41 )..........................
4 pieces
(4)
DC power cord (with 2P plug and fuse)
TR-7950(E30-1 685-05)1
TR7930(E30-1 674-05)
....... .
1
piece
(5) Spare fuse
TR-7950(i OA) (F05-i 031-05),.,. . 1 piece
TR-/930(8A)(F05-8021 -05)............
. 1 piece
(7) Miniature plug (for external speaker)
(Ei2-000i -1 5) .............................
1
piece
(9)
Warranty card..............................
. 1 copy
(10) Instruction manual ............................
1
copy

FEATURES
TR-7950 FEATURES'
• 21
NEW, multi-function memory channels
• Chaise of 45 or 25 watts output
The TR-7950 provides a hefty
45
watts
output,
while
the TR-7930 features a more modest 25 watts. A HI!
LOW power switch allows power reductior to
approx.
5 watts(adjustable).
• Long-life lithium battery memory back-up
Built-in lithium battery has an estimated 5 year life.
• Automatic offset
The microprocessor is pre-programmed for simplex
or
_600 kHz offset, in accordance with the ARRL 2 meter
band plan. "OS" key allows manual offset change.
• Programmable priority alert
The PR1ORITY channel may be programmed as any one
of the 21 memories, with the ALERT switch "ON," a
dual "beep" sounds when a signal is present
on the
PRIORITY channel. The OPER switch allows and in-
stant move to the PRIORITY channel.
• Programmble memory scan lock-out
"LO' key for programming the scan to skip selected
nemory channels, without erasing the memory.
The lower limit may
be programmed into memory "A"
and the upper limit into memory "B".
• Center stop during band-scan, with
indicator
Stops on a channel center during band-scan, with
center tuning
indicator.
• Scan resume selectable
Scan
stops
on busy channel. Selectable automatic time
resume-scan
(approx. 5 sec., adjustable), or carrier oper-
ated resume-scan. a scan delay after carrier-drop of ap-
prox. 1
.5
seconds is built-in.
• Programmable sub-tone channels
Optional TU-79 three frequency sub-tone unit provides
keyboard selectable sub-tone channels, which may be
stored in memory.
• Built-in
1 6-key autopatch. with adjustable monitor
The keyboard functions as a 16-key autopatch during
transmit
DTMF tones appear
in the speaker output
when a key is pressed during transmit.
• Front panel keyboard control
Used for selecting frequent panel keyboard control.
Optional accessories:
• TU-79 three frequency diode programmable tone unit.
• KPS-1 2 fixed-station power supply
for TR-7950.
• KPS-7A fixed-station power supply
for TR-793O.
• SP-40 compact mobile speaker.
9)b
iO 3

- .aasa,a, a* nfl , ,a Sen
BEFORE USE
rstFOE conneclon, check polanty
1W
2i
Do not
install near heater outlet
After parkwg in he sur, or
if
inside tempe ature s
0 coo
this urt BEFORE ransm tt g
This
unit is designed for 1 2V negatwe ground ONLY.
Keep equipment away from heat and out of
direct sunight.
STOP
Do
not adjust coil, trimmers or pots! These are factory
ad
justments.
4

SPECIFICATIONS
.................................................
...................................................
..................................................
................................................
............................................................
[GeneraU
Max. 9.5A in Ht transmit mode (TR7950)
[Transmitter]
[Receiver]
Circuitry.. ..
...
Double superheterodyne
Intermediate frequency
1st 10.695 MHz
2nd
455 kHz
Receiver sensitivity
Better than 30 dB for 0.5
pV
S^NIN
Better than 12 dB for 0.25 pV SINAD
Receiver selectivity More than
1 2 kHz (6 dB)
Less than
24 kHz (60 dB}
Spuriour response Better than
70 dB
Squelch sensitivity Less than 0.16 pV (threshold)
Auto scan stop level Less than
0.2 1zV (threshold)
Audio oui.put More than 2.0 watts across 8 ohms load (5% dist,)
Note: Circuit and ratings are subject to change without notice due to developments• in technology.
TR795O/793O
5

SECTION 1 INSTALLATION
1
1. Interconnection
Connect the antenna and power supply as shown in Fg
1 -1 for fixed station.
12. MOBILE nstaUation, [genera}
6
r
I

Un e drtver's seat
Understde of
dashboard
Stdeo
coso'
J
Lt
Drifi holes tn the bottom of
dashboard Secure the mounttrtg
bracket wtth nuts, and bolts
The transceiver should be acated
from your k ieee,
Hoof tOp tistallatton
Front fender
t,,utter
moo it
Trunk mount
Bee re o
Sr. ony.,
mobtie arterna
Ltft he trtrr plate and nstafl the
cab e
5
0 0
f f
"vail
R735OorTF'J93O
ate
1 2 Mobil Ope ano t ns allation
C
ty
f
t
errv at

Yagi antennas IARRAY)
To,
!
Ground plane
Coaxal cable
+
Rotor
Transceiver performance
depends largely on the type of antenna
/
Roter Control cable
Fig. 1 -3 Fixed Station Operation Installation
TR-7950 .
fflfl
or TR-7930
Antenna select
j2
SWR meter
switch
Yag antenna
Ground plane
antenna
It is convenient to install both
Yagi and ground plane antennas
for selectable use.
14. MEMORY BACK-UP LITHRJM BATTERY
A lithium battery is contained in the transceiver to retain
memory. Therefore, turning off the POWER switch, dis-
connecting the power cable, or a power failure will not
clear the memory. The battery will last approximately five
years.
When the battery discharges and erroneous display
may appear on the LCD. Lithium battery replacement
should be performed by an authorized Kenwood service
facility - either your Kenwood dealer, or the factory.
Note: --
______ ___________
When the lithium battery is replaced, the microprocessor must be
reset.
Press the microswitch accessible through the opening on
the bottom cover, as shown.
Fig. 1-4 Microprocessor reset
8
ini9 U

SECTION
2 CONTROLS AND TERMINALS
2-1, Front Pane!
(ij
VOL/POWER
Power ON-OFF switch and volume control are combined.
Turning the control fully counterclockwise will turn the
power OFF. Clockwise rotation will increases the volume.
®SQUELCH
The squelch control is used to eliminate noise during no-
signal time, Normally, this control is adjusted clockwise
until the noise disappears and the Center Tuning indicator
goes off (threshold level). For scan operation, this control
must be set to the threshold point.
® LCD and Indicator Group
ri ri iii I ri i
rrrri
H
[1T
jr
____
MHz
I
-
REV
C. TUNING
PRIO
- _
1
35 7
9
a)
TX shift indicators:
EJBy pressing the
key on the keyboard, the indica-
tor will light in sequence to show transmit frequency is
switched down 600 KHz from the receive frequency.
By pressing the
key on the keyboard, the E indica-
tor
will light in sequence to show the transceiver is
operating in the simplex mode.
EJBy pressing the
key on the keyboard, the
Jindica-
tor will light in sequence to show transmit frequency is
switched up 600 KHz from the receive frequency.
b) LiJ indicator:
By pressing the TONE pushbutton the four digit frequency
display changes to show which of three preset subaudible
frequency channels is selected. iJ does not display at FO
(no tone). TU-79 option required.
c)
1 indicator lights
when scan operation is in pro-
gress.
d) This section displays either frequency in four digit
(146.520 MHz is displayed as
6.520 ), or one of four
subtone conditions (Fl -3, or 0, no tone).
TR795O/793O
9

g) I ns ED ndicato g ts wher ftc REV swtch is ON
l
h
'ndc,ates
e ra ce e has stoppel at ciarnel
center
)
T s LED nd at s he PRIORITY OPER swcc ON
S/RI e mete
s LED
'l
Tie er
ndcates relative rece e rput
sgn stre 'igt or ansm't RF output
4 Keyboa d
BEE ER'IOr E EDBACK
he
umbor keys u cton as autopatcl keys
5
ON AIR Inthcator
This hght emitting diode (L E D,) will hght during transmit
n ode
6 MORY Channel Selecto
Ths
Wa
h s
used
to select one of 21 mer'r orj c a iels
Of hose, channels 1 1 5 store frequeices includir g -'- 600
kHz offset, Channels, 16 17 and 18
19 are paired
for
DD-SPLlT ope ation
Channel A ftores the pro-
g ammed sca i
low frequency limrt, and channel B stores
he hgh frequency mit.
7
MIC Connector (6 pm)
or conrecton of the supplied mcrop'lone (or and MC 46
autopatch mcrophone).
8 REVS vtch
swach is used to reve se the repeater shift ( 600
Pz) anc othe trans
Tiit/
ecevc f equencies (CH 1 6 - 1 7
8-19)
ONE switch
Prcss ths switch to desgnte the tone preset frequency
cianrcl alorg wi l theL
o
keys. (TU 79 optior
re u'red for ope a 'o

ority channel. By de-
aency is switched to
LED lights to show
HIGH/LOW switch
© SCAN switch
©• PRIORITY ALERT SwItch
keyboard operation;
mory channel opera-
2-2 Rear Panel
minal.
Q) DC
Power Term inal
DC
power input terminal Connect the supplied power
cord with
plug. Input voltage
is 1 3.8V DC.
Observe plus(+)
and minus(-) polarityl
© EXT. SP
Terminal
External speaker terminal Connect a
4
1 6
ohm
speaker
using the supplied plug.
©
UP/DWN Switches
j PTT Switch
Press-to-talk switch used for transmission, This will also
release scan operation.
TR-79or7q() 11

SECTION 3 OPERATION
3-1 BEFORE OPERATION
For frequencies outside the 144.000 - 148.000 MHz,
the transceiver operates only in the simplex mode.
3-2 SQUELCH
3.3 MEMORY INPUT
Example: Storing 144.650 MHz with +600 kHz shift and
subaudible tone "1 in memory channel 5,
3-4 CHANGING MEMORY FREQUENCIES
If you wish to change any memory frequency, store a new
frequency in that channel using the precious procedure.
The old frequency is erased when the new frequency is
stored.
3-5 SCAN OPERATION
The SCAN operation is divided into keyboard scan, me-
mory scan and priority channel scan. For SCAN operation,
the squelch control should be advanced to the threshold
point. See section 3-2 Squelch.
First, select either timer operated hold (TO) carrier (signal)
operated hold (CO) with the SCAN switch.
• MEMORY SCAN from the keyboard
1. Set the SELECT switch to M. CH.
2. Press the 1J key to initiate scanning.
The scan will beigin from the displayed channel ad-
vancing, toward the higher numbered channels. During
this operation, holding the microphone DWN switch
changes scan direction backward. Releasing the DWN
switch returns scan direction forward. Holding the UP
switch permits accelerated scanning.
12 TR79O/793O

3-6 SCAN STOP
3-7 SCAN LOCKOUT OPERATION
3-8 PRORITV CHANNEL SELECT
Any one of the 21 memory channels can be selected as
the priority channel.
1.
Set the SELECT switch to M. CH.
2. Press the PRIORITY-ALERT switch in.
3. Select the memory to be the priority channel.
4. Press the key to enter this instruction.
The scan timer is factory preset at approximately 5 se-
conds. This can be adjusted from 2 to 6 seconds.
1.
Place the SCAN switch to TO.
2. Turn the SQL control fully counterclockwise to open
the squelch.
3.
Place the SELECT switch to M. CH.
4. Initiate scan by pressing thekey.
5.
Adjust VR1 (X53-1280-1O) to the desired delay. (see
Botton Biew on page 14.>
3-12
AUTOPATCH SIDETONE
AND BEEPER
LEVEL ADJUSTMENT
TR795O/793O 1 3

3-13 PAIRED CHANNELS
_li1
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X55-1330--1O
U WJ>
L3
ra
TU79
unit
installation
Top View
3-14 TUJ9 (OPTION) INSTALLATION
14 TR795O/793O
9
H
Bottom View
TU-79

SECTION 4 ADDITIONAL INFORMATION
41 General Information
42 How the TX Final Module are Protected
44 Ordering Spare Parts
4-5 Service
Final
module protection is provided by sampling the re
flected power. As the reflected power is increased (higher
SWR) transmitter drive is reduced, thus decreasing input
to the final module. This in turn reduces collector loss,
protecting the final transistor.
4-3 Battery Precaution
When charging your vehicle battery,
or when jump-
starting a dead battery, ALWAYS disconnect the power
cable from the back of the transceiver,
TR795O/793O
'I 5

SECTION
5 OPTIONAL ACCESSORIES
The following accessories
are available for more sophisti
cated operation
of your transceiver.
5i Fixed Station DC Power Supply KPS1 2A
The KPS1 2 DC power supply
matches both the TR-7950
and TR793O while the KPS7A matches
the TR793O.
52 SP4O External Speaker
Designes primarily for mobile operation. Styling
and tone
quality match ytour tranceiver.
53 TU79
Tone Unit
SP-40
1 6
TR795O/793O

MEMO
c
17