User's Manual

1.5.14 DME Transmitter to Antenna Interconnect
a. Refer to Figure 1-7. Route ½” Heliax RF feedcable through conduit and connect to antenna connector
J1 (RF INPUT).
b. Route ¼” Heliax antenna monitor cable through conduit and connect to antenna connector J2 (RF
MONITOR OUTPUT). Note that in most installations the J3 RF MONITOR OUTPUT port can be
used instead of J2 however J2 is preferred.
c. Route obstruction light power cable through conduit and to antenna connector J4 (OBSTN LT
INPUT).
d. Connect ½” Heliax RF feedcable to DME transmitter connector 1J1 (RF OUT).
e. Connect ¼” Heliax antenna monitor cable to DME transmitter connector 1J2 (ANT MON1).
f. Place obstruction light circuit breaker to the ON position. Verify obstruction lights illuminate.
g. Using PVC cement, glue 2" PVC conduit connections previously installed.
1.5.15 Connecting VOR or ILS Keyer Wiring
a. Verify that the primary AC power (located in the shelter main circuit breaker box), VOR equipment
and DME equipment circuit breakers are in the OFF position.
b. Using the two-conductor electrical cable and forked terminal lugs provided in the AC
Power/Installation kit (Figure Error! Reference source not found.), connect KEY_OUT+ and
KEY_OUT- signals from the 1A19 Interface CCA located in rear of the DME cabinet to the
appropriate location as identified in Table 1-4.
Note after equipment startup refer to section Error! Reference source not found. Error! Reference
source not found. to configure external keying.
Table 1-4 External Keying Connection Locations
SELEX Navaid
KEY_OUT+ (1A19TB2-14)
Destination
KEY_OUT- (1A19TB2-15)
Destination
1150 VOR TB10-5 TB10-6
2100 Localizer 1A18TB4-1 1A18TB4-2
2110 Glideslope 1A18TB4-1 1A18TB4-2
1.5.16 RCSU and RMM Connections
a. If the DME is provided with a 2238 RCSU then connect the copper wires from the RCSU to the
1A19TB2-1 and 1A19TB2-2 locations on the Interface CCA for a Dedicated Modem connection type.
For a RF Modem/Fiber connection type, the RS232 connection should be made to the 1A19J5 DB9
connector. DIP switch S2-1 located on the 1A8A1 Low Power Backplane CCA should be set to match
the Connection Type as well.
b. If a telephone line is available for remote maintenance monitoring (RMM), connect the tip and ring
wires from the telephone interface box to the 1A19 Interface CCA locations TB2-3 and TB2-4.
Polarity is not important. DIP switch S2-2 located on the 1A8A1 Low Power Backplane CCA should
be set to “DIAL-UP” when using this internal dial-up modem. Use the two-conductor electrical cable
provided in the AC Power/Installation kit (Figure Error! Reference source not found.) for this
connection.
c. If the DME’s internal dial-up modem is unable to comply with local telephone requirements then
connect the telephone line to an external modem and connect the external modem serial port to the
1A19 Interface CCA J6 connector. DIP switch S2-2 located on the 1A8A1 Low Power Backplane
CCA should be set to “~EXTERNAL” when using an external dial-up modem. Reset the DME station
after changing the S2-2 switch.
d. DIP switch S1-6 located on the 1A8A1 Low Power Backplane CCA controls whether the DME station
will allow remote configuration of transmitter and monitor parameters. When set to “RMT