CAUTION
THE TRANSMITTER MUST BE GROUNDED WITH A LOW IMPED-
ANCE PATH. THE OUTER CONDUCTOR OF THE RF TRANSMIS-
SION LINE IS NOT AN ADEQUATE GROUND.
2.11
RF Output Connection
The RF output connection is a 3-1/8 inch gas barrier EIA flange
connector, (Female). A bullet and O-ring are provided and
packed separately. This combination allows mating to a male or
female transmission line connector. After the RF output termina-
tion is made, make sure the spark gap, E101 in the Output
Network Compartment, is set to 0.125 inches.
2.11.1
Dummy Antenna Information
It is very useful to be able to switch the transmitter RF output to
a dummy antenna for testing. This testing frequently includes
modulating with tones. With tone modulation, 100% modulation
of a 30 kW carrier produces an average power of 45 kilowatts.
Sustained asymmetrical modulation of a 25 kW carrier, with
-100% and +140% peaks, will produce 47 kW of average power
that must be absorbed and dissipated by the load. The instanta-
neous peak power under these conditions will be approximately
152 kW. When selecting a dummy load, select a power rating
sufficient for the type of testing to be done. The peak power
should be considered when selecting a water cooled load.
2.12
Customer Interface Connections
The following paragraphs include information on customer in-
terface connections for:
•
Audio Input
•
Frequency and Modulation Monitors
•
External Interlocks
•
External RF Input
Refer to paragraphs on Remote Control connections for a de-
scription of various interface connections.
2.12.1
Audio Input
Use a shielded pair audio cable for connection between process-
ing equipment and Audio Input terminal TB3 on the External
Interface. The External Interface is located at the top of the right
side wall in the Center Control Compartment.
Audio input connections are as follows:
•
TB3-1: Shield (to transmitter chassis ground).
•
TB3-2: Audio (+)
WIRE #
FROM
TO
LOCATION/DESCRIPTION
PA/OUTPUT CABINET INTERCONNECT
154
F17
2TB1-1
OUTPUT NETWORK CABINET
155
F18
2TB1-2
SAME
156
F19
2TB1-3
SAME
121
A27-J7
2J1
SAME
519
A27-J1
A26-J1
OUTPUT SAMPLE BOARD IN OUTPUT NETWORK CABINET
96
A17-J3
T6
PA CABINET, PA COMBINER OUTPUT BAR AND COVER ASSEMBLY
STEP START PANEL INTERCONNECT
13TB1-1TB3-1SINGLE PHASE AC INPUT TO PA CABINET *
23TB1-2TB3-2SINGLE PHASE AC INPUT TO PA CABINET *
33TB1-3TB3-3GROUND
8 CONDUCTOR CABLE
SHIELD
3TB1-4TB3-4 **
BLK
3TB1-5TB3-5 **
BLU
3TB1-6TB3-6 **
BRN
3TB1-7TB3-7 **
GRN
3TB1-8TB3-8 **
ORN
3TB1-9TB3-9 **
RED
3TB1-10TB3-10 **
WHT
3TB1-11TB3-11 **
153TB1-15TB3-15K1 AND K2 COIL VOLTAGE
163TB1-16TB3-16K1 AND K2 COIL VOLTAGE
2 CONDUCTOR CABLE
SHIELD
3TB1-14
TB3-14
BLK
3TB1-17
TB3-17
WHT
3TB1-18
TB3-18
(Note: WHT may be clear or RED.)
* NOTE: #1, #2, & #3 are 14 AWG. Electric
code may require different wire size being
used.
** NOTE: This is only a suggested order to follow.
The color coding may vary between different wire
manufactures. (e.g. BRN substituted with
RED/BLK. YEL substituted with WHT/BLK.
The important thing is to maintain the 1 to 1
interconnect between 3TB1 and TB3.)
NOTE: YEL or 8th does not need to be connected.
Table 2-3. Interconnect Wiring Check List
Section II - Installation
Rev. AA: 8/9/2000
888-2297-002
2-5
WARNING: Disconnect primary power prior to servicing.
