500 WATT RADIOBEACON TRANSMITTER
ND2000A-02x-xx0
Page 1-1
15 January 2005
SECTION 1
GENERAL INFORMATION
INTRODUCTION
1.1
The ND2000A radiobeacon transmitter is a
dual transmitter that operates in the LF/MF band at
500 watts maximum (carrier) power. It transmits
beacon identification signals at a repetition rate of
eight seconds. Provision is made for standby codes to
be transmitted when the primary exciter/keyer is
switched to the secondary exciter/keyer or when
commanded from an external source. Provision is
also made for press-to-talk voice telephony. Tone
identification and voice signals utilize amplitude
modulation. Refer to table 1-2 for a technical
summary.
PURPOSE AND SCOPE OF MANUAL
1.2
This manual provides the information
necessary to install, operate and maintain the subject
transmitter.
PURPOSE OF EQUIPMENT
1.3
When combined with an appropriate
antenna system, the transmitter provides reliable
facilities for airfield locator or aeronautical enroute
requirements. It is ideally suited for remote or
unmanned sites. To determine the configuration of a
specific transmitter, obtain the complete part number
from the transmitter's nameplate and then refer to
figure 1-2.
FACTORY REPAIR SERVICE
1.4
Nautel provides a factory module repair
service for users of Nautel's transmitters. Users who
do not have repair facilities or who are not able to
repair an assembly may utilize this service for a
nominal fee. Refer to Warranty (page 2) for address
of Nautel's repair facility and information to be
supplied with returned parts.
MECHANICAL DESCRIPTION
1.5
The ND2000A radiobeacon transmitter is
packaged in a single cabinet that weighs
approximately 400 pounds (182 kilograms). Refer to
figure MD-38 for dimensional information. The RF
output coaxial cable connects to a connector on the
top of the transmitter cabinet. External ac power and,
if applicable, dc power cabling enter the cabinet
through cable entry holes on the lower, left and right
rear section of the cabinet. External input (audio and
control) and output (status and alarm monitoring)
cabling enter the cabinet through cable entry holes on
the top section of transmitter cabinet.
1.5.1
TRANSMITTER CHASSIS
(see figures
MD-1 through MD-38)
:
The subject transmitter
chassis is a fabricated metal cabinet that accepts
standard 19-inch rack mounted assemblies. The rear
section of the transmitter is fitted with a lockable, full-
depth hinged door. The cabinet is effectively divided
into functional sections and the assemblies that are not
plug-in or removable modules are fastened to support
brackets. Side panels are removable to permit access
to the interior during maintenance routines.
1.5.1.1
The cabinet contains the electrical
components that are not installed in the plug-in
modules and the mechanical positioning hardware to
guide and align the plug-in modules. The connectors
and the supporting hardware for the plug-in modules
are integral parts of the cable wiring harness. Refer to
figure MD-1 to determine the identity and location of
the plug-in modules that form the subject transmitter.
The control/monitor panel (A1) is mounted on a
hinged door at the top, front section of the transmitter.
Harmonic filter assembly (A9), monitor PWB (A10)
and an optional battery panel (A11) are located
immediately behind it. Access to these assemblies
can be attained by opening the control/monitor panel's
hinged door.
