6.3. Initial Hook Up
1. Ensure that the antenna has been swept and, ideally, has a return loss of greater than 20dB
(VSWR = 1.2:1). This should be done before connecting the antenna cable to the system’s output.
The power amplifier’s control system allows the user to change the VSWR trip point up to a
maximum level of 1.8:1, unless a custom VSWR protection system has been requested. Strive
for the lowest possible return loss to maximize transmission distance and improve operating
performance. Unless requested otherwise at the time of purchase, VSWR levels between the trip
point set by the user and 1.8:1 (or custom VSWR trip point) will cause a fold back in power. VSWR
levels past 1.8:1 (or custom VSWR trip point) will cause the system to shut down or fold back with
attenuation to avoid damage.
2. Place the amplifier in its permanent location near a receptacle supplying the required AC or DC
mains voltage.
3. Place an appropriate AC or DC power line protector, conditioner, and/or surge suppressor across
the supply line. This small investment is highly recommended to protect the equipment from power
surges and spikes (not covered by warranty).
4. Install a lightning surge arrestor or Gas Discharge Tube (GDT) on the coax near the antenna to
protect the amplifier. This small investment is highly recommended to protect the equipment from
lightning (not covered by warranty).
5. Connect the transmitting antenna cable to the RF OUT female connector on the PA enclosure’s
RF output. On units that have a separate filter or filter/power supply enclosure after the power
amplifier enclosure, ensure to connect the transmitting antenna cable on the last enclosure in the
chain to the RF Out and connect the RF coaxial between the power amplifier and the second
enclosure in the chain. The system must be loaded into a 50-ohm load before any power is turned
on for over-the-air systems. The Wiring Hookup is included in the shipping package and visually
summarizes the aforementioned information.
6. Connect the desired audio source connection, analog mono or stereo, digital audio, or
MPX. Subcarrier signals can be connected to the SCA1 or SCA2 BNC connectors.
7. Connect additional control/monitoring cables if desired. SNMP or Ethernet should be connected
to the lower RJ45 on the back panel. Remote port connections are made to the DB25 connector
and the internal RDS in controlled by RS232 on the DB9 connector.
At this stage, the system is set up and ready to do a preliminary start up, as outlined in the “Operating
Procedure” section.
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