Yaesu FL-2000B Manuale utente

INSTRUCTION

MANUAL

FL-2000B

YAESU MUSEN CO., LTD.

TOKYO JAPAN

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Amateur Radio Directory

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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

DO NOT TURN ON THE FL-2000B WITH THE TOPSHIELD COVER REMOVED.

THE HIGH VOLTAGE SAFETY LOCK SHORTS OUT THE HIGH VOLTAGE AND

WILL DAMAGE THE POWER SUPPLY CIRCUIT.

- 1 -

SPECIFICATIONS

Circuit : Grounded Grid Class B

Frequency Coverage : Ham bands 80 through 10 meters

Plate Input : 1200 Watts PEP, 1000 Watts CW and 600 Watts AM

Plate voltage : 2400 Volts DC

Drive Requirement : 100 Watts PEP

Input Impedance : 50 ohms, unbalanced

Output Impedance : 50 - 75 ohms, unbalanced

Third Order Distortion : 30 db or better at 1000 Watts PEP

Tube Complement : 2 x 572B/T160

Cooling : Forced-air cooling

Power Requirements : AC 100, 1 10 Volts 50/60Hz 17 Amps

AC 200, 220, 230 Volts 50/60Hz 9 Amps

Dimensions : 141/2" Wide, 61/4" High, 111/2" Deep

Weight : 44 Ibs

FRONT PANEL CONTROLS

POWER - OFF : Rocker switch turns power on

OPER - TUNE. : Rocker switch applies Bias when standby and relay

is disengaged.

SWR - IP : Rocker switch selects either SWR or plate current

meter reading.

F - R : Rocker switch selects either forward or reflected

SWR bridge reading.

SENS : Potentiometer adjusts meter sensitivity for SWR

measurement.

PLATE : Plate capacitor in tank circuit.

INSTALLATION

The FL-2000B has been designed incorporating two safety locks to prevent

dangerous high voltage shock. However, extreme care is recommended when

servicing inside the cabinet.

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Amateur Radio Directory

Unpacking

Carefully remove FL-2000B and tubes from their packing cartons and examine them

for any visible shipping damage, check the control knobs and switches for complete

freedom of action. Should any damage be apparent, notify the delivering carrier

immediately stating the nature of the damage in detail.

Tube Installation.

Tubes can be installed after removing the top cover (see SERVICING). First, check

to see if the tube holders at the tube sockets are loose enough to install tubes. If not,

loosen them. Notice the mark pin of the tube base comes to the right of the socket

for correct insertion into the socket.

Push the tubes straight in to insert them and fasten the tube holders. Insert the plate

caps on the top of the tubes. Check to make sure that the plastic choke coil has

enough clearance from the surrounding parts to avoid electrical short.

After replacing the top shield of the tube compartment and the top cover, the

amplifier can be connected for operation.

In general, care should be taken to insure that enough space is allowed around the

amplifier cabinet to permit adequate air circulation within the linear amplifier. Do not

cover the top of the FL-2000B with books, papers or other equipment. Do not insert

anything under the bottom of the FL-2000B or overheating may result.

POWER REQUIREMENT

The FL-2000B has a built-in power supply which can be operated from either 100,

117 or 220 volts AC 50-60 cps. The FL-2000B is shipped from the factory

connected to operate on 220 volts AC.

- 3 -

It is recommended that the FL-2000B is operated from its own 220 volt 10 amp or

greater circuit. If 117 or 100 volts is all that is available, it should be fused for 20

Amps, circuit conductors should be larger than #10 and no other equipment should

be operated from this circuit. Do NOT, under any circumstances, operate the FL-

2000B from a 115 volt lighting circuit, as the circuit conductors are not large enough

to carry this load.

The following diagram shows the wiring connections for 1 10, 1 15 and 220 volt

operation. Connections must be made as shown or serious damage may result.

- 4 -

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ANTENNA REQUIREMENT

The FL.-2000B has been designed for use with an antenna resonant at the operating

frequency and having approximate impedance within the limit of 40 to 80 ohms. The

nominal output impedance of the FL-2000B is 50 ohms. When the impedance of the

antenna used is far from this value, it is recommended that an antenna matching

network be used which will allow the FL-2000B to work into its nominal 50 ohm load

for maximum power transfer into the antenna.

GROUND REQUIREMENT

The FL-2000B should be connected to a good earth ground through as

short and as large a gauge wire as possible for best performance and maximum

safety. A connecting post marked "GND" is provided on the rear apron of the

chassis.

CAUTION

NEVER OPERATE THE FL-2000B WITHOUT FIRST CONNECTING IT TO AN

EARTH GROUND, AND AN ANTENNA OR 50 OHM DUMMY LOAD, OR SERIOUS

DAMAGE MAY RESULT.

EXCITER REQUIREMENT

To operate the FL-2000B at its maximum power input, it will be required that the

exciter deliver 100 Watts PEP SSB output. Our FT-400/500, FT-560, FT-200 and

FT-101 transceivers and FL-400 transmitter all have sufficient power to drive the

FL-2000B at its maximum input. The exciter should be placed as close to the

amplifier as practical to avoid long coax and ground connections.

ALC

On the rear of the FL-2000B, a terminal is provided for connection to the exciter of

the ALC voltage which controls the gain of the exciter to prevent distortion caused by

peak clipping.

- 5 -

Relay Control

RY and E terminal on the rear of the FL-2000B are provided for connection to the

exciter relay circuit which is normally open, and which closes on transmit and thus

keys the FL-2000B at the same time. E terminal should be connected to ground for

exciters whose relay contact connects to ground on transmit. The terminals are

jumpered with a wire for testing purposes when the unit is shipped from the factory.

OPERATION

CAUTION

BE SURE THAT THE FL-2000B IS CONNECTED TO A 50 OHM ANTENNA

SYSTEM OR A 50 OHM DUMMY LOAD AND THAT THE PROPER POWER

CONNECTION HAS BEEN MADE FOR THE LINE VOLTAGE THAT IS TO BE

USED. (SEE PAGE 4)

For all modes of operation, the FL-2000B is tuned up with a single R. F. frequency

driving it. The exciter may be tuned up on CW into the antenna connected to the

FL-2000B with operation switch at STBY position, or by leaving the FL-2000B

power off. After the exciter has been tuned up, turn the exciter to standby and turn

the operation switch to "OPER" position.

Presetting of the Controls

POWER switch : OFF

OPER switch : STBY

SWR/IP switch : IP

BAND switch : Desired band

PLATE Control : To the number given in the following chart

LOAD Control : Fully counter-clockwise on number zero

- 6 -

BAND

PLATE

6-7

7-8

8-9

Turn the power switch of FL-2000B on and wait for a few seconds for tube warm up.

Turn OPER switch onto "OPER" position.

Turn on the exciter and increase the exciter output while not exceeding 0.2 Amps

plate current and tune the-plate control for dip in the plate current. Alternately adjust

the plate and heading controls while increasing the exciter-power in small increments

until maximum R. F. output occurs at 0.5 Amps plate current. Do not exceed 10

seconds at maximum input to protect the tubes.

To measure relative power output, set the meter switch to "SWR" and "F" (forward)

position. If the relative output meter goes off scale during tune up, reduce the meter

sensitivity control in a downward direction. Approximate settings of the loading

control at maximum input are given in the chart on page for 50 ohm load.

Now you are ready for CW and SSB operation.

For SSB operation, the exciter should be adjusted to run the FL-2000B plate current

between 0.2 and 0.3 Amps under normal voice operating conditions, because the

meter cannot follow speech speed.

For AM operation, tune up the FL-2000B as described previously. Then the exciter

should be adjusted to run the FL-2000B at 0.2 Amps plate current with unmodulated

carrier.

To measure the SWR of the antenna system, set the meter switch to SWR and apply

R. F. power to the antenna. Adjust the meter sensitivity control to read

- 7 -

full scale at SWR switch "F" position. Turn SWR switch to "R" position, then SWR

may be read directly from upper scale of the meter.

THEORY OF OPERATION

The FL-2000B is designed to use two 572B/T160 zero bias triodes in a class B

grounded grid configuration.

The RF driving power delivered to the input is applied to the tube filaments through a

changeover relay and a pi-network on each band which is selected by the input

switch S2a. The input switch is ganged to the band switch S1.

The RF voltage appearing on the grid of the tube is coupled through C203 to ALC

rectifier diodes D201 and D202. The plate potential of D201 is determined by R1,

R2, R3, so that adequate automatic level control voltage is available to control the

exciter. The bias is set by R4 for 0.09 Amps idle current. In standby, the cold end of

S4 is opened so that bias voltage cuts off the tubes. The plate circuit is coupled to

the 50 ohm output load by an adjustable pi-network through the SWR bridge circuit.

SERVICING

WARNING

EXTREME CAUTION SHOULD BE TAKEN WHENEVER MAKING ANY

ADJUSTMENTS INSIDE THE CABINET. BEFORE OPENING THE CABINET

COVER, UNPLUG THE POWER PLUG FROM THE AC LINE.

Removing Top and Bottom Covers

After disconnecting the power cord from the AC line, the top cover can be easily and

safely removed by pulling up the two lock fasteners.

The bottom cover can be removed by taking out the four screws on it.

- 8 -

Removing Shield Cover

After removing the top cover, the shield cover of the PA compartment can be

removed by taking out two screws on the shield cover. The safety lock shorts out the

charge condensed in the capacitor.

Removing the Cabinet

After removing six screws on the front end and two in the bottom of the cabinet, the

cabinet can be slid out backwards from the chassis and panel assembly.

Tube Replacement

If it becomes necessary to replace the tubes in the FL-2000B, the same

manufacturer brand should be used.

Trouble Shooting

During long periods of operation, it is quite possible that some problem will arise

which cannot be cured by tube substitution. If this occurs, it is recommended that

you either return it to your dealer or write us in detail.

Input Coil Alignment

The input coils are adjusted at the factory for the center of each band and are broad

enough to cover the entire band. However, if the tubes are replaced with a brand

other than originally supplied, the input coils may have to be realigned. The

alignment is done with a 50 ohm SWR meter inserted between the exciter output and

the FL-2000B's RF input coax jack. First disconnect the FL-2000B from the power

line, remove the top and bottom covers and disconnect the wiring from the high

voltage transformer secondary terminals.

Recover the top cover. The amplifier should be connected to the exciter as for

normal operation with the exception of the SWR meter in the input line. Preset the

controls as follows:

- 9-

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