Related Manuals for Command Technologies COMMANDER VHF-2000
Summary of Contents for Command Technologies COMMANDER VHF-2000
- Page 1 COMMANDER VHF-1200/2000 LINEAR AMPLIFIER 6 METERS - 50 - 54 MHz. MADE IN THE U.S.A. BY HAMS FOR HAMS COMMAND TECHNOLOGIES, Inc. 15719 CR 2.50 P.O. Box 326 EDON, OHIO 43518 419 459 4689 800-736-0443...
- Page 2 We appreciate your purchase of a Command Technologies product and assure you of continued factory support of your investment at all times.
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Page 3: Specifications
SPECIFICATIONS COMMANDER VHF 1200 LINEAR POWER AMPLIFIER FREQUENCY RANGE - 50 - 54 MHz. MODES - USB,LSB,RTTY,FM,CW POWER REQUIREMENTS -117/ 200/234VAC 50/60 Hz. RF DRIVE POWER - 15 - 25 WATTS NOMINAL - 35-40 WATTS MAX. FOR FULL OUTPUT (1.2 KW SSB ) RF OUTPUT-+15DB GAIN OR OVER 750 WATTS 600 WATTS MAX. - Page 4 SPECIFICATIONS COMMANDER VHF 2000 LINEAR POWER AMPLIFIER FREQUENCY RANGE - 50 - 54 MHz. MODES - USB,LSB,RTTY,FM,CW POWER REQUIREMENTS - 200/234VAC 50/60 Hz. RF DRIVE POWER - 15 - 25 WATTS NOMINAL - 35-50 WATTS MAX. FOR FULL OUTPUT (1.5 KW SSB ) RF OUTPUT- +15DB GAIN OR 1500 WATTS 1200 WATTS MAX.
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Page 5: Unpacking Instructions
UNPACKING INSTRUCTIONS Carefully remove your Commander Amplifier from its shipping carton making sure there is no damage evident from shipping. If there is any damage, notify the delivering shipper immediately, fully describing the damage. Do not destroy the packing material, since it may be reusable later, should you require factory service, or need to transport the Amplifier for any other reason. - Page 6 CAUTIONS Do not attempt any type of service or repair on this Amplifier without first removing the AC power and allowing at LEAST 60 MINUTES FOR THE HIGH VOLTAGE CAPACITORS TO BLEED OFF ! Make no attempt to put this Amplifier in service with the top or bottom covers removed.
- Page 7 INTRODUCTION The Commander VHF-1200/2000 are Grounded Grid class Ab2 Linear Power Amplifiers that operate on the Amateur 6 meter band. Over-Drive and Over-Grid current protection is provided by an Auto-Reset circuit the places the amplifier in Stand-By if a preset limit is exceeded. Genuine Eimac 3CPX800A7 External Anode Triode(s) with forced air cooling and modern circuitry, insure efficient and conservative operation.
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Page 8: Installation Preparation
INSTALLATION PREPARATION Location of your Commander VHF-1200/2000 requires that no equipment be placed directly above it, as air expelled from the tube exhaust can become quite hot. Allow at least 3 inches clearance on either side of the unit between other equipment. To switch from transmit to receive the Commander VHF-1200/2000 requires a contact closure or keying circuit capable of sinking 55 ma. -
Page 9: Transformer Installation
TRANSFORMER INSTALLATION (Hypersil VHF-1200/2000) When mounting the hypersil transformer, place the VHF-1200/2000 so the front panel faces your body. The wire leads coming out of the transformer should be to the rear and the connector to the right. Place the transformer in the unit aligning the transformer's mounting holes to the mounting holes on the bottom of the chassis. - Page 10 117/200/234 VAC Operation The Commander VHF-2000 comes factory wired for 234 VAC operation. For best operation, you should use a dedicated 234 VAC main capable of supplying 20 Amps of peak AC current. Unless for Export or user specified all VHF-1200 Amps. are wired for 117 VAC.
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Page 11: Connection Diagram
Connection Diagram Connect the RF output of your transceiver to the RF IN connector on the rear of the VHF-1200/2000 with 50 ohm coax. Connect the existing station antenna system to the RF OUT connector on the VHF-1200/2000 with RG-8 type coax. Connect the RELAY phono jack on the rear of the VHF-1200/2000 to the normally open terminal of the RELAY jack on your transceiver. -
Page 12: Operating Procedure
OPERATING PROCEDURE After reading this manual and completing the Installation / Preparation Instructions. Position the Commander VHF-1200/2000 front panel controls as follows. ON / OFF - OFF OPERATE / STANDBY - STANDBY METER SWITCH - VP (PLATE VOLTAGE) LOAD - 50 - MIDDLE OF RANGE TUNE - MINIMUM CAPACITANCE (POINTER TO LEFT) After presetting these controls, switch the ON / OFF switch to the ON position . - Page 13 OPERATING PROCEDURE CONTINUED With the meter switch in the Ip position and while monitoring grid current the Commander VHF-1200/2000 is ready for on the air operation. Normal SSB operation is indicated by plate and grid current meter readings on voice peaks of approximately 1\3 to 1\2 of the CW keydown value.
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Page 14: Typical Operating Conditions
DRIVE -- GRID CURENT -- PLATE CURE NT - - POWER OUTPUT 30mA 700 mA 1000 Watts 45mA 1000mA 1500 Watts MADE IN THE U.S.A. BY HAMS FOR HAMS COMMAND TECHNOLOGIES, Inc. 15719 CR 2.50 P.O. Box 326 EDON, OHIO 43518 419 459 4689 800-736-0443... -
Page 15: Theory Of Operation
Theory Of Operation The Commander VHF-1200/2000 use Genuine Eimac 3CPX800A7 ceramic/metal triode(s) in a class AB2 grounded grid configuration. Nominal drive power of 35 to 50 watts will deliver full rating of clean RF output power. Metering Functions The Commander VHF-1200/2000 have two illuminated panel meters. - Page 16 AUTOMATIC DRIVE LIMITING CONTROL An adjustable automatic level control (ALC) circuit limits the peak output power. When properly set, this circuit insures that the amplifier can not be over driven. Rear panel access allows for easy manual adjustment . A sample of the RF input derives the ALC voltage.
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Page 17: Tuned Input Adjustments
TUNED INPUT CIRCUITS The tuned input circuits utilize an L-C-L or "T" impedance matching circuit with a high "Q" design. These circuits employ RF phase compensating inductors to reduce intermodulation products. The use of mica trimmer type capacitors allows adjustments to precisely match the transceiver to the amplifier. -
Page 18: High Voltage Supply
OUTPUT FILTER CIRCUIT The PI variable network filter transforms the plate load impedance from approximately 1600 ohms down to 200 ohms, Two air variable capacitors and an associated inductor accomplish this transformation. A design "Q" of 14 allows for good harmonic attenuation all across the band. The utilization of a special reactance tuned powdered iron core 4 to 1 Transmission line transformer transforms the nominal 50 ohm antenna impedance up to the 200 ohm output of the PI circuit. -
Page 19: Limited Warranty
Correct maintenance, repair, and use are important to obtain proper performance from this product. Therefore, carefully read the Instruction Manual. This warranty does not apply to any defect that Command Technologies, Inc. determines is due to : 1. Improper maintenance or repair including the installation of parts or accessories that do not conform to the quality and specifications of the original parts.
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