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INSTRUCTION

MANUAL

FL-2000B

YAESU MUSEN CO., LTD.

TOKYO JAPAN

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Summary of Contents for FL-2000B

Page 1: ...INSTRUCTION MANUAL FL 2000B YAESU MUSEN CO LTD TOKYO JAPAN Downloaded by Amateur Radio Directory ...

Page 2: ...o 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 ope...

Page 3: ...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 S...

Page 4: ...t 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 th...

Page 5: ...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 Downloaded by Amateur Radio ...

Page 6: ...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 F...

Page 7: ...YSTEM 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 bee...

Page 8: ... 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 ...

Page 9: ...he 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 E...

Page 10: ... 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 ...

Page 11: ...there is high voltage AC on the secondary terminals of the high voltage transformer Increase the output from the exciter until the amplifier plate meter read 0 1 Amps Tune the plate control for a dip in plate current and tune the slug on the correct input coil for a minimum reflected power reading on the SWR meter that is connected to the input line After re alignment disconnect the power cord fro...

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