Harris Broadcast Flexiva FAX 10KW, Technical Manual

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Section-1 Introduction
October 28, 2013
1 ‐ 22
Copyright ©2013, Harris Broadcast WARNING: Disconnect primary power prior to servicing. 888 ‐ 2720 ‐ 001
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Amount of line variation expected
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Line Voltage and frequency
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Single or three phase
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Current output required
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Correction type (individual or all three phases)
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Bypass switch required or not
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Input and output breakers required
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Surge arrestor devices installed
The regulator should be sized taking into account the transmitters worst case power consumption, all associated
equipment to be ran from the AVR plus 25% headroom. This will ensure the AVR stays in regulation and not trip
breakers under heavy loads and start up.
For 3 ‐ Phase applications, it is preferred that the AVR correct on the individual phases, this will provide phase to
phase regulation and better dependability of the equipment.
1.14 RF Line Requirements
The RF output connector on FAX transmitter depends on the model. The FAX5/10 has a 1 ‐ 5/8" EIA unflanged output
connector. If the FAX5/10 is racked in a Harris Broadcast rack, the RF connector at the top will be a 1 ‐ 5/8" EIA flanged
connector that includes a adapter to a unflanged connection. There is an optional adapter to allow for a 3 ‐ 1/8" EIA
unflanged connection for models with 1 ‐ 5/8 EIA output. All transmitter models have a RF output impedance of 50
ohms unbalanced.
There are two major factors in selecting the correct transmission line for the application, line loss and line power
handling capability. Air dielectric lines tend to be more efficient but require pressurization. Foam dielectric lines
tend to be less efficient (more loss).
When considering the power handling capability requirement of the line, consider peak voltages not just the power
of the transmitter. Also the environment to be installed in, extremely high heat will degrade the power handling
characteristics of the line.
All air dielectric transmission lines should be pressurized to the line or antenna manufacturers recommendations.
Consult manufacturer to determine best product for each system.
Figure 1-14 FAX5/10 Transmitter 1-5/8 RF Output Connector (rear of amplifier)