Page 4
Dual ND500II (User Supplied Cabinet) – IS03003
Issue 1.0
Information Sheet
(k)
If used, connect external 24 or 48
VDC power source wiring (see
ND500II manual for DC power source
options) to 3A1TB4-1 (+) and 3A1TB1-
2 (-).
(l)
If used, connect external control/
monitor wiring to terminal blocks
(3A1TB1, 3A1TB2, 3A1TB3 and
3A1TB6) or D-sub connectors (3A1J1
and 3A1J8) as depicted in figure 1.
See figures 5 and 6 for dual
transmitter interface assembly/ PWB
detail.
NOTE
Refer to the associated ND500II transmitter
manual for instructions on enabling and
disabling the remote power trim feature.
If the optional remote control unit (unit 4) is
installed, refer to its service instruction
manual for detailed information regarding
remote control inputs/outputs.
(m)
Connect a continuous, insulated 4
AWG copper wire or one-inch copper
braid between the station lightning/
safety ground and the cabinet's station
reference ground connection. Ensure
this wire does not contact any other
conductive surface of the cabinet.
(n)
Connect the antenna system's RF
feed cable to the exterior portion of the
cabinet's RF output coaxial connector,
if present. If not, connect the feed
cable to A7J2 of transmitter A.
(o)
Re-install rear covers on transmitters
(A and B) that were removed in step
(e).
5. INITIAL START-UP PROCEDURES
Transmitters A and B should not be fully
operated as a dual transmitter system until
each transmitter’s initial start-up procedure
(described in the ND500II instruction
manual) has been completed/ verified.
Verify the operation of each transmitter as
follows:
(a)
Connect the dual system’s RF output
to a 250-watt dummy load.
(b)
With both transmitters’
POWER
switches set to
OFF
, turn on the AC
power applied to the cabinet.
(c)
Set transmitter A’s
POWER
switch to
ON
.
On the dual transmitter interface
panel, press
LOCAL CONTROL
and
SELECT A
.
Transmitter A should be
operating into the dummy load.
Perform initial start-up procedures as
described in the ND500II transmitter
manual.
(d)
Set transmitter A’s
POWER
switch to
OFF
and transmitter B’s
POWER
switch
to
ON
.
On the dual transmitter
interface panel, press
SELECT B
.
Transmitter B should be operating into
the dummy load. Perform initial start-
up procedures as described in the
ND500II transmitter manual.
(e)
Turn transmitters off, disconnect
dummy load and reconnect dual
transmitter for operation into the
system antenna.
(f)
If the optional remote control unit (unit
4) is used:
-
Set transmitters A and B and dual
interface assembly (unit 3) to remote
control mode, using their front panel
switches.
