Harris Platinum HT EL 2000LS, Technical Manual

Page: 35 / 90

Section III
Operation
3.1
Introduction
This section identifies all controls and indicators associated with
the Platinum™ Series HT EL Transmitter. The exciter control
panel contains the operator controls, indicators and metering for
the transmitter. The Interface Logic Module has additional indi-
cators for power supply status and reflected RF power foldback.
3.2
Controls And Indicators
Refer to Figure 3-1 for the location of all controls and indicators
associated with day-to-day standard operation of the transmitter.
The function of each control and indicator is listed in Table 3-1.
Interface Logic Module 1A3 LED indicators
INDICATOR FUNCTION
+5 VOLT Indicates the 5 volt logic supply is on
+12 VOLT Indicates the +12 volt supply is on
-12 VOLT Indicates the -12 volt supply is on
+50 VOLT Indicates the 50 volt supply is on
VIS F/B ACT Indicates reflected visual RF power is
causing the visual power to foldback
AUR F/B ACT Indicates reflected aural RF power is
causing the aural power to foldback
3.3
Local Turn-on and Turn-off
The control panel on the front of the exciter contains all the
operator controls and fault indicators. To turn the transmitter on
first apply a video signal to the video input. After the VIDEO
LOSS indicator turns off, pressing the transmitter ON button will
place the transmitter on air.
Next select visual output power (VIS FWD) on the multimeter
and press visual raise “up arrow” or visual lower “down arrow”
button to set the visual power output level.
Next select aural output power (AUR FWD) on the multimeter
and press aural raise “up arrow” or lower “down arrow” to set
the power output level. If the transmitter is to be operated by
remote control press REMOTE button to enable the command
remote control inputs.
To turn transmitter off, push the OFF button.
3.4
Video Controlled Operation
If the loss of video jumper 1A3JP1 is in the 1-2 position and the
over-ride jumper on 1A2JP1 is in NORMAL position the loss of
video detector is enabled. This provides two user adjustable
delays one for video present and the other video loss delay. When
video is applied, the video present delay timer will holdoff turn
on of the transmitter until the present delay times out. On loss of
video, the transmitter will change to a predetermined (adjustable)
cw power level until the loss timer has timed out, then automat-
ically turn transmitter off.
3.5
Remote Control/Extended Operation
Verify that the HT EL is not in local operation mode. The
transmitter can the be operated by following the instructions for
the control system in use.
If the transmitter fails to operate begin analyses by checking the
status of the indicator LED’s on the control panel. Refer trou-
bleshooting and repair to qualified technical personnel. Theory
of operation and other troubleshooting information are in appro-
priate sections of the manual.
888-2457-001 3-1
WARNING: Disconnect primary power prior to servicing.