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Yaesu FC-902 User Manual

Yaesu FC-902
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INSTRUCTION
MANUAL
FC-902
YAESU
MUSEN
CO.,
LTD.
TOKYO,
JAPAN
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Yaesu FC-902 Specifications

General IconGeneral
BrandYaesu
ModelFC-902
CategoryAntenna
LanguageEnglish

Summary

FC-902 Antenna Coupler Overview

FC-902 Specifications

Front Panel Controls

TUNE Control

Capacitive adjustment of coupling between transmitter and impedance. Adjusted for minimum SWR.

BAND Switch

Selects inductance for matching. DIRECT position bypasses circuitry.

SWR SET Control

Calibrates the SWR meter for accurate readings by adjusting meter deflection.

LOAD Control

Adjusts coupling between antenna feedline and impedance presented by the BAND switch inductor.

ANT SELECT Switch

Selects one of three coax-fed antennas or a single wire antenna for matching.

POWER & SWR Switch

Selects meter sensitivity for power and calibrates SWR measurement.

FWD POWER Meter

Reads output power on three scales: 25W, 250W, and 500W.

SWR Meter

Provides accurate SWR measurement when calibrated for adjusting controls.

Rear Panel Connections

ANT 1, ANT 2, ANT 3 Connectors

Three female UHF-type connectors for coaxial feedlines or dummy loads.

WIRE Terminal

Threaded terminal for single-wire antennas like the "Windom" type.

GND Terminal

Connects to good earth ground for stray currents and RF reduction.

INPUT Connector

UHF receptacle for connection between FC-902 and transmitter/transceiver.

Antenna Matching Procedure

Notes on Antenna Matching

Tune-up Time Limits

Emphasizes not exceeding maximum time limits during tune-up, especially at full power.

Shack Matching vs. Line Losses

Shack matching doesn't affect losses on the coaxial line to the antenna.

Transceiver Protection

FC-902 ensures 50 ohm load for protection against high SWR.

Recording Control Positions

Suggests recording TUNE/LOAD positions for specific antennas for quick reference.

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