Nautel XR6, Руководство по предварительной установке

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XR6/XR3 Pre-installation Manual Accessories
Page 10-4 Issue 3.0 2009-07-15
Automatic switching system
The automatic switching system is a changeover rack for the XR6/XR3 that includes an automatic
antenna transfer control unit and an RF contactor. The main component of the automatic switching
system is a double-pole, double-throw latching switch.
Dynamic carrier control unit
The Dynamic Carrier Control (DCC) option is an add-on, DSP-based module for the XR6/XR3
exciter. This system reduces ac power consumption by reducing the carrier power when the
instantaneous modulation level of the transmitter drops below a threshold. The DCC unit supports
Amplitude Modulation Companding (AMC), Dynamic Amplitude Modulation (DAM) and Dynamic
Carrier Control (DCC) algorithms with various selectable carrier compression levels. Enhanced AMC
may also be available.
Spares
spares kit
The spares kit includes fans, fuses, and semiconductors. Contact Nautel Customer Support for details
about the contents of the spares kit for your transmitter.
XR series RF power module
The XR RF power module integrates four modulators and eight amplifier units, with a combined
power output rating of 9.4 kW, including carrier and modulation. It is compatible with all XR series
transmitters.
Figure 10.3: XR RF power module