Yaesu FL-2000B Instruction Manual - page 2
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FL-2000B LINEAR AMPLIFIER
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GENERAL
The YAESU FL-2000B Linear Amplifier is designed to match the "F" series
transceivers and transmitters in appearance and drive requirements to run high
power Snout covering the ham bands 80 through 10 meters.
The FL-2000B uses a pair of 572B/T160 transmitting triodes in a class B grounded
grid circuit configuration. The tubes are forced— air cooled by two very quiet high
speed internal fans.
Automatic Level Control circuit controls the exciter gain to allow the highest average
power without distortion caused by peak clipping. Changeover circuit biases the
tubes to cut-off, eliminating unwanted heat and diode noise generation when
receiving.
An internal changeover relay feeds the antenna to the exciter for barefoot operation
when the FL-2000B is turned off or is on standby condition. A built-in SWR bridge
measures SWR on by barefoot and linear operations.
The built-in solid state power supply requires no warm-up period and provides
excellent voltage regulation.
CAUTION
DONOT TURN ON THE FL-2000B WITH THE TOPSHIELD COVER REMOVED.
THE HIGH VOLTAGE SAFETY LOCKSHORTS OUT THE HIGH VOLTAGE AND
WILL DAMAGE THE POWER SUPPLY CIRCUIT.
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