Kenwood PS-511S User manual

^ K E N W O OD
Model PS-511S
OPERATING MANUAL

SPECIFICATIONS
The Kenwood PS-51 IS is a high stable power supply, which is designed
especially for use with the TS-511S transceiver. It features built-in commu¬
nication speaker, silicon rectifier for high tension voltage and voltage regulator.
CONTENTS
SPECIFICATIONS. 2
SECTION 1. INSTALLATION. 3
SECTION 2. CONTROLS & OPERATION. 4
SECTION 3. CIRCUIT DESCRIPTION. 5
SECTION 4. MAINTENANCE. 6
SCHEMATIC DIAGRAM. 7
OUTPUT
Terminal
Voltage
Current
900V
840V (970V)
390mA (0.6mA) DC
300V
300V (310V)
49mA (6mA)
DC
190V
195V (200V)
5mA (0.05mA)
DC
150 V
150V (150V)
52mA (85mA)
DC
-C
-90V (—90V)
13mA (15mA)
DC
12.6V (a)
13.6V 2.3A
AC
12.6V (b)
13.8 V
2.2A
AC
Notes:
The values are measured at the connector of the TS-51 IS when the TS-51 IS
is in transmit mode with 170 watts output, in CW mode. However, the values
in ( ) are measured when the TS-51 IS is in receive mode in CW mode.
SPEAKER SECTION
Diameter
Impedance
Frequency response
Rated input
POWER REQUIREMENT
SIZE
WEIGHT
3-17/32" x 5-1/2” (Ellipsoidal)
8 ohms
150 - 5,000 Hz
1.5 watts (max.)
117 Vac 50/60 Hz, 550 watts (max.)
7-7/8" wide x 6-11/16" high x 13-6/8" deep
(Excluding feet)
26.4 lbs.
2

SECTION 1. INSTALLATION
1.2 LOCATION
Select a proper operation location. It should be dry and free from
direct sunlight.
1.3 CONNECTIONS TO TS-511S
Connect the interconnecting fan and power cable between the trans¬
ceiver and the power supply. (See Fig. 1}
Fig l. Connections to TS-511S
1.1 UNPACKING
Carefully unpack the PS-51 IS and check that the following accessories
are included.
Interconnecting power cable 1
Plastic feet 2
Fuse (10A) 1
3

SECTION 2. CONTROLS
& OPERATION
2.1 FRONT PANEL
Indicator ( 1 on Fig. 2 )
The neon bulb lights up when power is on.
2.2 REAR PANEL
POWER SUPPLY connector ( 2 on Fig. 2)
This connector provides the power supply connection and speaker connection
with the TS-51 IS.
FAN socket { 3 on Fig. 2 )
This socket provides a power supply for the fan of the TS-51 IS.
GND lug ( 4 on Fig. 2 )
The ground lug is used for an adequate ground.
V ADJ control ( 5 on Fig. 2 )
The voltage of 150 V line is controlled slightly by this control ( VR 1 )
AC line cord ( 6 on Fig. 2 )
Fuse ( 10 A ) ( 7 on Fig. 2 )
2.3 O PERATION
The PS-51 IS power supply is not provided with a power on-off switch
since it can be operated from the power switch of the TS-51 IS.
4

SECTION 3. CIRCUIT DESCRIPTION
AC LINE
A TC type filter installed in this AC line is for preventing unwanted
radiation of radio waves from the AC power line.
900 V LINE
The 900 V high voltage is obtained from a voltage-doubling rectifier.
Two silicon diodes are used in series with each rectifier element to obtain
the required withstand voltage. A large resistance is also connected in parallel
with each silicon diode and electrolytic capacitor to prevent them from being
overloaded by unbalanced voltages.
300 V LINE
For the 300 V line, a silicon diode bridge rectifier and choke input
circuits are employed for extra voltage regulation and ripple-free operation.
190 V LINE
190 V is obtained through a resistor connected in series with the 300 V
line.
150 V LINE
The 150 V line is stabilized by a 6BM8 tube.
Principle of operation: When the 150 V line experiences a slight voltage drop
due to variation in the load, it reduces the grid voltage of the triode section
of the 6BM8 tube. Since the cathode is clamped at a constant voltage by
the neon bulb, the plate current decreases and hence the voltage drop across
R201 becomes less, increasing the plate voltage. Therefore, the grid bias
of the pentode section of the 6BM8 decreases to compensate for the
voltage drop in the 150 V line, which thus restores its normal constant value.
The output voltage can be controlled by adjusting the semi-fixed resistor
{VR 1).
BIAS (-C) LINE
The bias circuit is a half-wave rectifier built around a silicon diode.
12.G V LINE
There are two 12.6 V windings so that separate heater sources can
serve the pair of final amplifier tubes (6LQ6) and other vacuum tubes.
These voltages are designed higher (13.5 V) at the transformer windings since
they will drop as supplied to the TS-51 IS through the power cable.
6.3 V LINE
The 6.3 V powers the heater of the 6BM8. This winding is maintained
at a + 150 V level to provide against insulation breakdown between the
cathode and heater.
SPEAKER TERMINAL
The speaker terminal shares the same power supply connector with
other power outputs. This power supply connector also constitutes the
transformer primary winding circuit to enable the power supply to be switch¬
ed from the TS-511S transceiver.
5

SECTION 4. MAINTENANCE
4.1 REMOVING THE CHASSIS FROM THE CASE
The chassis can be removed upward after unscrewing 2 black screws
from the top and 4 each from both the right and left sides. It is unnecessary
to remove bottom screws since the bottom plate comes off along with the
chassis.
4.2 FUSE ( 10 A )
If the fuse blown, be sure to check for the cause before replacement.
Use a 10 A fuse for replacement.
4.3 150 V LINE
The stabilized 150 V line has been factory-adjusted. However, if it
becomes out of adjustment for some reason, readjust the semi-fixed resistor
(VR 1) so that 150 V is obtained with the TS-511S in receive mode.
6

El
FAN
SCHEMATIC DIAGRAM
NOTE: We reserve the right to make modifications in this model in accordance with technical developments.
PS-51 IS

f K E N W O O g
Manufactured by TRIO ELECTRONICS, INC., Tokyo, Japan
©13512 PRINTED IN JAPAN B50-0675-00 (1)