TYP E K R CARRI ER SET
C A U T I O N
If the transmitter output load is removed
while the transmitter is energized, the transistors in
the power amplifier will be p ermanently damaged. 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
coax cable to ground before changing taps on the Line
OPERATION
5 1-Volt K-DAR, HZM, and GCY Relaying,
Telemetering, and Supervisory
129-Volt K-DAR and GCY Relaying
1 29-Volt HZM Relaying, Telemetering,
and Supervisory
258-Volt K-D AR and GCY Relaying
258-Volt HZM Relaying, Telemetering,
and Supervisory
Various combinations
of the inductors and
capacitors of the transmitter output filter are re
quired depending on the channel frequency. These are
tabulated in Fig. 7.
A d j ustments
'l'his apparatus is generally tuned to and tested
at the specified channel frequency before shipment.
Final adjustments must be made in the field and are
described in the following paragraphs. Fig. 4 shows
the locations of the various controls.
Transmitter
1. Disconnect the coaxial cable and replace with
a 50 , 60 , or 70 ohm non-inductive resistor depending
on the characteristic impedance of the cable used.
2. Fig. 7 shows typical output filter connections
for various frequency ranges. In some cases it may be
necessary to use either a higher or lower range to
tune the filter to resonance.
3. Insert fuses FL- 1 and FL-2 to apply power to
the apparatus.
4. Connect an A-C Vacuum Tube Voltmeter
( VTVM) across the non-inductive load.
Tuner or m atching transformer.
Internal
Neces sary internal connections are generally
made at the factory, to customer order, before app ara
tus shipment. For reference purposes, these are
outlined in the following tabulation. Check the proper
bleeder resi stors before applying voltage to the
equipment.
BLEEDER RESISTORS IN THE CIRCUIT
R-47 and R-48
R-45 , R-4 7 and R-48
R-4 1 , R-45, R-4 7 and R-48
R-39 , 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 by closing the
CARRIER TEST SWITCH. An alternative is to jumper
battery positive to terminal 15.
6. Beginning with the output control R-4 2 at the
maximum counterclockwise position , advance it clock
wise until a reading appears on the VTVM. · Tune
capacitor C- 19 for a m aximum voltmeter reading.
7. While increasing R-42, tune the output filter
for maximum output until the output across the re
sistor is approxim ately 8 volts. (See Figs. 10 and
1 8 . )
( Approximately 5. 5-volts when operating from
5 1-volt station battery.)
8. Open the test switch and reconnect the coaxial
cable.
Receiver
1. The oscillator output control R-4 is pre-set at
the factory. Howev er, 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 jacks J-3 and J-4.
b. Adjust R-4 for a 0 . 3 volt reading on the meter.
2. The unit is shipped to have a gain of approxi-
7
www
. ElectricalPartManuals
. com
Summary of Contents for Type KR
Page 38: ...w w w E l e c t r i c a l P a r t M a n u a l s c o m...
Page 39: ...w w w E l e c t r i c a l P a r t M a n u a l s c o m...
Page 118: ...TYPE K R CARRI E R SET w w w E l e c t r i c a l P a r t M a n u a l s c o m...
Page 123: ...w w w E l e c t r i c a l P a r t M a n u a l s c o m...
