Nautel NARF79, Installation Manual

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VX150 TO VX2 INSTALLATION MANUAL RF OUTPUT REQUIREMENTS
VERSION 0.3 2021-01-14 PAGE 1.6.1
SECTION 1.6: RF OUTPUT REQUIREMENTS
This section describes requirements associated with the antenna and RF cabling to be used with the VX
series transmitter. Antenna considerations include the following:
 Antenna Feed Cable
 Antenna System
For detailed information about protecting the antenna system from lightning strikes, see Nautel’s
Recommendations for Transmitter Site Preparation Manual
.
NOTE
:
This section provides the information required to determine your antenna feed cable and plan for
its connection to the transmitter. Physical connections are made in
Section 1.10, “Completing External
Connections” on page 1.10.1
.
Antenna Feed Cable
The antenna feed line interconnecting the transmitter and the antenna system should be a suitably
rated coaxial cable. The RF output is configured to accept a male N-type connection (VX150, VX300 and
VX600) or a male 7/16 DIN connection (VX1, VX1.5 and VX2).
Antenna System
Ideally, the antenna system should present 50 ± j0 ohms impedance at the carrier frequency and have
sufficient bandwidth to allow transmission of the modulated carrier. The transmitter will function at
rated power while operating into a maximum VSWR of 1.5:1, after which the transmitter begins to fold
back the RF output (up to a VSWR of 3:1). Circuitry within the transmitter will prevent damage to the
transmitter from high VSWR loads.