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AMERITRON AL-80B, Instruction Manual

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AMERITRON AL-80B Instruction Manual Download Page 34

AL-80B Instruction Manual 

30 

 

Notes:

 

Summary of Contents for AL-80B

Page 1: ...THE VOLTAGES INSIDE THIS AMPLIFIER CAN BE FATAL PLEASE READ THIS MANUAL BEFORE ATTEMPTING TO OPERATE EQUIPMENT Improper or abusive operation of this amplifier can damage the tubes or other components...

Page 2: ...irmly press the tube into the socket Do NOT twist or force the tube into the socket Install the anode connector on the tube s anode terminal and secure it with the screw provided Snug the screw enough...

Page 3: ...er 7 Tube Life 8 Export Modifications 9 Technical Assistance 9 Installation Guidelines And Suggestions 10 Location Of The Amplifier 10 Ventilation 10 Power Connections 10 Grounding 11 Transformer Conn...

Page 4: ...Operation 22 Audio Distortion 22 QSK Operation 23 Periodic Maintenance 23 Parts List 25 Power Supply SWR Board 50 0080 1 25 Tuned Input Board 50 0080 2 26 AL 80B Tuned Input Chart 26 Meter Board 50 00...

Page 5: ...es The AL 80B has two illuminated cross needle panel meters The left meter provides a continuous reading of grid and plate currents The right meter indicates peak RF power output on one scale and Plat...

Page 6: ...load voltage 3100 V Full load voltage 2700 V Full load current 6 A Regulation 13 Transformer 26 lb E I lamination grain oriented Capacitors 26 mFd total computer grade Normal line current at rated CW...

Page 7: ...tes the primary circuit of the power transformer The interlock will open and de energize the transformer primary if the top cover is removed WARNING High voltage can kill Accidental contact with the v...

Page 8: ...linear amplifiers to dissipate hundreds of watts during low or no signal periods This creates needless heat since virtually no dissipation is required unless the amplifier is being driven with large s...

Page 9: ...fails the amplifier will not start If F101 fails from a momentary HV to ground fault meter protection diode D117 may also fail See the Metering Functions section that follows for more information Met...

Page 10: ...on page 12 for information on correcting excessive high voltage REF The multimeter measures the antenna or load peak envelope reflected power and the SWR when the MULTIMETER switch is placed in the RE...

Page 11: ...nd PEP has no fixed ratio to average power on any mode except FM FSK or CW It is impossible to use a formula or rule of thumb approximation to convert between average and peak voice waveform powers PE...

Page 12: ...likely to damage the tube s control grid or anode Applying full drive power for several seconds with excessively light loading can cause control grid damage Several seconds of high drive power operati...

Page 13: ...n will allow operation on frequencies above 15 meters Instructions for this modification are available by sending a written request for Export Modification Instructions along with a copy of a valid am...

Page 14: ...ricated type that requires no maintenance in normal operation To insure adequate cooling in your installation please observe the following 1 Do not block or unduly restrict the ventilation holes in th...

Page 15: ...electrical continuity in the water supply system Install a jumper around any insulated pipe connections you find Use heavy copper wire or flashing with stainless hose or pipe clamps for the jumpers Th...

Page 16: ...R G wire can be reversed This will reduce the plate voltage of the AL 80B to permit operation at output levels below 400 watts WARNING The AL 80B requires different back panel fuses for various line v...

Page 17: ...terminal Avoid using braided conductors for ground leads 5 The 12 V connection on the rear panel provides 12 Vdc at 200 mA maximum to operate external dial lamps or accessories such as the ATR 15 Ant...

Page 18: ...nt for a given amount of drive The efficiency of the amplifier and the grid current decrease if the LOAD control is rotated beyond the point of maximum output The linearity however will increase The p...

Page 19: ...the exciter s microphone gain or RF output level adjustment It will control the fullness of the ALC and the average output power It will have very little effect on the peak output power however The f...

Page 20: ...en standardized The ALC voltage requirements may even vary between different models produced by the same manufacturer If the ALC response time of the exciter transceiver is faster than the rise time o...

Page 21: ...an exciter that delivers more than 70 watts Proper control settings will help prevent excessive grid current and spurious signals which create needless interference to other operators A monitor scope...

Page 22: ...perator s voice the amount of signal compression or processing and the tube characteristics Tuning Follow the instructions below in numerical order Proper tuning will produce excellent output power a...

Page 23: ...d light and the blower should start Read the 3500 volt scale on the multimeter It should indicate 3100 volts nominal and no more than 3200 volts 4 With the amplifier still on STBY tune the exciter int...

Page 24: ...panel ALC SET control until the multimeter indicates 10 volts This adjustment will limit the amplifier s grid current to approximately 100 mA STEPS 10a and 11a REQUIRE A CONNECTION FROM THE AMPLIFIER...

Page 25: ...rols are adjusted for maximum power output on the internal peak reading RF wattmeter with either a two tone generator or sustained HEL L L L L O driving the exciter The ALC SET control should then be...

Page 26: ...aximum signal conditions less a safety factor in AM operation Since this linear amplifier has a peak plate efficiency of nearly 65 the carrier efficiency must be kept below 30 to maintain linearity Th...

Page 27: ...e switch can be used with almost all types of amplifiers and transmitters Modifications are not required in amplifiers used with the QSK 5 unit The QSK 5 operates directly from 120 Vac power lines Ame...

Page 28: ...ment failure or personal injury The cover should be removed and a low value 40 to 500 ohm two watt or larger resistor should be secured to the chassis The other end of this resistor should be connecte...

Page 29: ...2122 C133 2200 uF 25 V 203 0207 C134 220 uF 25 V 203 0565 R101 4 7k mox 1 W 103 1747 R102 470k 1 4 W 100 0188 R103 104 121 10k 1 4 W 100 4100 R105 10 ohm 1 2 W 100 0727 R106 1 5 ohm 2 W 1 103 3400 R10...

Page 30: ...8 5775 15 17 360 208 5688 6 75T 405 1067 220 208 5175 10 12 220 208 5175 4 75T 405 1047 180 208 5396 Meter Board 50 0080 3 Designator Description Ameritron PN D301 1N34A 300 0346 C301 302 47 uF 50 V t...

Page 31: ...zener 301 710 IC501 LM 358 dual op amp 311 0724 Q501 NPN transistor MJF3055 305 3055 Q502 PNP transistor 2N3906 307 0722 Q503 504 NPN transistor 2N3904 305 0645 R501 503 10k 1 2 W 101 0643 R504 505 3...

Page 32: ...oard Assembly 50 0080 3 50 0080 4 RF Tank Board Assembly only parts L1 L2 50 0080 4 50 0080 5 Timer Overload Board Assembly optional See page 27 50 0080 5 L1 L Coil 10 13165 L2 LF Coil mounted on 50 0...

Page 33: ...20 meters 10 1 15 5 MHz 15 meters 16 5 21 5 MHz 15 meters 16 5 21 5 MHz 10 meters 24 29 MHz Operation on 11 13 MHz 15 5 16 5 MHz and 25 27 9 MHz will damage components Amplifier Tuning Log Band LOAD...

Page 34: ...AL 80B Instruction Manual 30 Notes...

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