Westinghouse Type KR Installation & Operating Instructions Manual page 47

TYPE KR CAR Rl ER SET
the power amplifier will be p ermanently damag ed. A
dummy load should be connected to the transmitter
output if the coax is disconnected and the transmitter
is to be energized.
When tuning line coupling equipment, short the
coaxial cabl e to ground before changing taps on th e
Line Tuner or matching transform er.
OPERATION
48-Volt K-DAR, HZM, and
Tel emetering, and Supervi sory
GCY
1 2 5-Volt K-DAR and
1 2 5-Vol t HZM Relaying, 'l'elemetering,
and Supervisory
GCY
25D-Volt K-DAR and
25().. Volt HZM Relaying, Telemetering,
and Sup ervisory
Various combinations of the inductors and ca­
pacitors of the tran smitter output fil ter are required
depending on t h e channel frequency. These are tab­
9.
ulated in Fig.
Ad j u st m e n t s
This appar atu s i s general l y tuned t o and tested
at the specified channel frequ ency before shipment.
Final adjustments m u st be made in the fiel d and are
descri bed in the following p ar agraphs. Fig.
the l ocations of t h e variou s control s .
Tran smitter
1. Disconnect the coaxial cabl e and replacd with
0 60 , 70
a 5 or ohm non-inductive resi stor depending
,
on the char acteristic imp edan c e of the cable used.
9
2. Fig. shows typical output filter connections
for var ious frequency ranges. In some cas e s it may
be necessar y to use either a high er or lower range to
tune the filter to r esonance.
3.
Insert fu ses F - 1 and F- 2 to apply power to
the apparatus.
4. Connect an A-C
(VTVM) across the non-inductive load.
GCY
Relaying,
Relaying
Rel aying
6
shows
Vacuum Tube Voltmeter
Internal
Neces sary internal
made at the factory , to customer order, before app ara­
tus shipment. For reference purpose s ,
outlined in the following tabulation. Check the proper
bleeder res i stors before
equipment.
BL EEDER RESISTORS IN THE CIRCUIT
R-47 and R-48
R-45 , R-47 and R-48
R-4 1 , R-45 , R-4 7 and R-48
R-3 9 , R-40 , R-45 , R-47 and R-48
R- 39 , R-40, R-4 1 , R-45, R-47 and
R-48
5. Unblock the transmitter
CARRIER TEST SWITCH. An alternative is to jumper
battery positive to terminal 1 5 .
6. Beginning with t h e output control R-42 at the
m aximum counterclockwise position, advance it clock·
wise until a reading appears on the VTVM. · Tune
capacitor C- 1 9 for a m aximum voltmeter reading.
7.
Whi l e increasing R-42, tune the output filter
for maximum output until the output across the re­
s i stor is approximately 8 volts. (See Fi gs.
1 3. )
(Appro ximately _ 5 . 5-volts when
5 1-volt stati o n bat tery . )
8 .
Open the test switch and reconnect the coaxial
cable.
Receiver
1. The oscillator output control R-4 is pre-set at
the factory. However, should any of the oscillator
components be changed (including the transistors and
the crystal) R-4 will require adjustment.
a. Connect an A-C VTVM to j acks J-3 and J-4.
b. Adjust R-4 for a 0 . 3 volt reading o n the meter.
2. The unit is shipped to have a gain of approxi-
connections are generally
these are
applying voltage to the
by closing the
1 and
2
operating from
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