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INSTALLATION PREPARATION 

 

The Commander VHF-144 is factory wired for operation from an 234VAC line

. Operation at 

the full rated output should not be attempted unless the AC line is capable of supplying at least 
15 amps of peak current. It is strongly recommended that you operate this amplifier from a 
234VAC line.  

Install an appropriate plug on the end of the power cord to mate with your wall receptacle. 

If you change the operating voltage as described above, be sure to install the proper fuse.  

The fuse is a type SFE, 20 Amp for 234 VAC & 200 VAC operation. 

All Commander VHF-144 amplifiers manufactured for export are wired for 200 or 234VAC, 

50 or 60 Hz, depending on the final destination. No plug is supplied with the AC line cord. 

Location of your Commander VHF-144 requires that no equipment be placed directly 

against the left side vent, as air expelled from the tube exhaust can become quite hot. Allow at 
least 3 inches clearance on the side of the unit and between other equipment.  

To switch from transmit to receive the Commander VHF-144 requires a contact closure or 

keying circuit capable of sinking 15ma of positive voltage (12 VDC open circuit) to ground. 
This connection is made to the RCA jack on the rear panel marked KEY. Read the manual that 
came with your transceiver to determine the proper external connections. On some transceivers, 
this is not provided, and an alternate circuit will be required. Always use shielded cable for 
these connections. 

Connect a good quality thru-line analog Wattmeter between the amplifier output jack and the 

antenna or dummy load using RG8 or better coax. 

Connect the exciter (transceiver) RF output to the amplifier input using 50 ohm coax. 

Connect a ground lead, as short as possible, from earth ground to the Commander VHF-

144’s rear panel ground terminal. 

!!CAUTION!! 

BE SURE YOU HAVE REMOVED THE LINE CORD PLUG FROM YOUR WALL 

SOCKET BEFORE REMOVING THE JUMPER COVER.  IF YOU FAIL TO UNPLUG 

YOUR AMPLIFIER, YOU WILL EXPOSE YOURSELF TO LETHAL VOLTAGES

.  

 

AC SOCKET CONNECTIONS 

White 

(Natural) 

Green 

(Ground) 

Black  

(230 VAC) 

Black 

White 

Green 

Amplifier 

Wall Outlet 

Summary of Contents for COMMANDER VHF-144

Page 1: ...2 METER LINEAR AMPLIFIER Owner s Manual PALSTAR INC Command Technologies Division 9676 N Looney Road Piqua Ohio 45356 U S A Customer Service and Sales Telephone 800 773 7931 Fax 937 773 8003 E mail i...

Page 2: ...Procedure 9 Operating Hints 10 Typical Operating Conditions Table 10 Warranty Service and Returns 11 HV Power Supply Schematic 12 AC Mains Step Start Schematic 13 Control Metering Board Schematic 14 R...

Page 3: ...band An automatic delay circuit for proper cathode conditioning before RF drive is applied which extends tube life This is preformed by a microprocessor which also controls a step start dual relay sy...

Page 4: ...lower Load Tuning Capacitor Input Tuning Piston Capacitor 3CPX800A7 Triode Tube Filament Transformer High Voltage Interlock Switch Duel Meter Control Board w Mutliple LED Backlighting High Voltage Boa...

Page 5: ...adjustable Output Impedance 50 Ohms nominal Antenna Load VSWR 2 1 maximum Harmonic Suppression better than 60db down at rated output Intermodulation Distortion better than 35 dB down at rated output W...

Page 6: ...internal RF tube compartment covers removed CONTACT WITH VOLTAGES IN THE CABINET CAN BE FATAL CLOSE QUAR TER EXPOSURE TO UNSHIELDED RF AT THESE POWER LEVELS AND FRE QUENCY IS HAZARDOUS TO YOUR HEALTH...

Page 7: ...ol Multi turn Piston Capacitor Preset at Factory Multimeter Relative Output Grid Current LOAD Control INPUT Control STANDBY OPERATE Switch ON OFF Switch Power Ready Light RF In RF Out Bypass SWR Adjus...

Page 8: ...e of the unit and between other equipment To switch from transmit to receive the Commander VHF 144 requires a contact closure or keying circuit capable of sinking 15ma of positive voltage 12 VDC open...

Page 9: ...tion Switch the OPERATE STANDBY switch to the OPERATE position and key the exciter with ZERO RF drive applied The Red Transmit light should illuminate the tube will be biased on and plate idling curre...

Page 10: ...someone changes these ad justments it will not be necessary to retune the amplifier each time you operate it Just turn the unit on wait for the green light and begin transmitting If you decide later t...

Page 11: ...ability other than herein stated Shipping Your Amplifier Back to the Factory Due to the necessity of shipping the amplifier with the HV transformer removed please contact the factory for instructions...

Page 12: ...12 Commander VHF 144 HV Power Supply...

Page 13: ...13 AC Mains and Step Start Board VHF 144 13 5VAC...

Page 14: ...14 Control and Metering Board VHF 144...

Page 15: ...15 RF Deck VHF 144...

Page 16: ...16 Commander VHF 144 T R Relay Board...

Page 17: ...17 Commander VHF 144 Voltage Doubler Power Supply Board...

Page 18: ...18 RF Deck 3CPX800A7 Triode Tube Load Tuning Capacitor Input Tuning Piston Capacitor RF Plate Choke Plate Capacitor 120pf 7 7kv...

Page 19: ...19 Dual Meters Grid Current Scale 0 60ma Single Tube Top 0 120ma Two Tubes Mid 0 180ma Three Tubes Bottom Grid Current Scale 0 600ma Single Tube Top 0 1200ma Two Tubes Mid 0 1800ma Three Tubes Bottom...

Page 20: ...20 Meter Board Cathode Fuse...

Page 21: ...21 Step Start Board AC Main Fuse 20A x 2 AC Interlock Step Start Relays x 4...

Page 22: ...22 Power Supply 470uF Capacitor 450 vdc x 8 HV Sense RF Output...

Page 23: ...23...

Page 24: ...24 Palstar Incorporated 9676 N Looney Rd Piqua OH 45356 USA Customer Service and Sales Telephone 1 800 773 7931 Fax 1 937 773 8003 Email info palstar com Version 1 0 2010 03 29...

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