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AL-800H Instruction Manual

Timer / Overload Board (50-0117-2)

Designator Description

Ameritron

P/N

C501-506

.01 uF 50 V disc

200-0416

C507,508

.47 uF tantalum

203-0530

C509

100 uF 25 V

203-0564

D501, 502

1N4001

300-0266

D503

5.6 V zener

301-710

IC501

LM 358 dual op-amp

311-0724

Q501

NPN transistor MJF3055

305-3055

Q502, 504

PNP transistor 2N3906

307-0722

Q503, 505

NPN transistor 2N3904

305-0645

R501-503

10k 1/2 W

101-0643

R504, 505

3.3k 1/4 W

100-0729

R506, 508

680 ohm 1/4 W

100-0532

R507

1.8k 1/4 W

100-0728

R509

1 meg 1/4 W

100-0730

R510

1k 1/4 W

100-0727

R511

180 ohm 1/2 W

101-0384

R512, 513

4.7k 1/4 W

100-3470

R514, 515

470 ohm 1/4 W

100-2470

RLY501

DPDT 12 V dip relay

408-2135

FB 73-801 Ferrite Bead

10-15168

Содержание Al-800H

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

Страница 2: ...s Install the rubber chimneys over the tubes The seam of the chimneys must face the fiber panel The bottom of the chimney has notches that must fit over the grid connectors near the base of the tube R...

Страница 3: ...Envelope Power vs Average Power 8 Tube Life 8 Export Modifications 9 Technical Assistance 10 Installation Guidelines and Suggestions 11 Location Of The Amplifier 11 Ventilation 11 Power Connections 11...

Страница 4: ...Operation 23 Periodic Maintenance 24 Parts List 25 Power Supply SWR Board 50 0800H 1 25 Tuned Input Board 50 0800H 2 26 AL 800H Tuned Input Chart 26 Meter Board 50 0800H 3 26 Timer Overload Board 50...

Страница 5: ...ves for smooth tuning Logging scales allow quick and repeatable control adjustment for rapid band changes The AL 800H has two illuminated cross needle panel meters the left meter provides a continuous...

Страница 6: ...oltage 2250 V Full load current 1 2 A Regulation 15 Transformer 32 lb E I lamination grain oriented Capacitors 63 mFd total computer grade Normal line current at rated CW output 14A at 240 Vac Normal...

Страница 7: ...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 volta...

Страница 8: ...ith large signal levels The AL 800H contains an exclusive bias circuit that reduces the idling quiescent current very close to the tube s cut off region The power amplifier tube in the AL 800H has a f...

Страница 9: ...will latch on and remove the voltage from terminal 3 and relay RLY101 power supply board Thermal Overload The transformer in this amplifier contains an internal temperature sensor This sensor disables...

Страница 10: ...F101 during start up If F101 or the 10 ohm resistor R27 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 METERS se...

Страница 11: ...is marked every 10 watts below 100 watts and every 100 watts from 100 to 500 watts NOTE The SWR of the load can be measured when the MULTIMETER switch is in the REF position by observing the different...

Страница 12: ...rid A fraction of a second of incorrect tuning can cause control grid damage This is especially true in amplifiers that use fuses or resistors to protect the grids Fuses and resistors are much too slo...

Страница 13: ...y manifest itself as a loud pop when the amplifier is first turned on or during conditions of high anode voltage A gas arc will often damage diode D117 on the negative rail of the filter capacitor ban...

Страница 14: ...For service or written correspondence use the following address AMERITRON 116 Willow Rd Starkville MS 39759 Telephone 662 323 8211 FAX 662 323 6551 NOTE Service history has clearly shown that most pr...

Страница 15: ...th cabinet mounted fans 3 The most efficient way to improve airflow is to pressurize the air inlet area Be sure that any fan used to assist the inlet airflow has at least a 60 CFM rating 4 The exhaust...

Страница 16: ...sing braided or woven conductors they have very high resistance to both RF and lightning currents RF and lightning flows along the surface of conductors almost no current flows in the center of the co...

Страница 17: ...240 C B 1 2 15 245 C B 2 3 15 250 C B 1 3 15 90 B A D C 3 1 20 100 B A D C 3 2 20 110 B A D C 2 1 20 115 B A D C F E 20 125 B A D C 1 2 20 130 B A D C 2 3 20 140 B A D C 1 3 20 Factory wired WARNING T...

Страница 18: ...ments vary with different manufacturers The ALC section describes adjustment of this circuit in detail Operating Instructions And Guidelines Front Panel Controls MULTIMETER Switch This four position s...

Страница 19: ...oading control properly can result in excessive tank circuit voltages and damage to components The PLATE control should always be checked after the LOAD control is adjusted by more than one number For...

Страница 20: ...especially if the heavy ALC levels are used in conjunction with other speech processing In these situations operating in a quiet room and close talking the microphone will minimize objectionable backg...

Страница 21: ...wly advancing this control clockwise The ALC LIMIT ADJUSTMENT section that follows gives adjustment details An external 1 000 to 5 000 ohm potentiometer can be added from the ALC output line to ground...

Страница 22: ...while the plate current and output power increase slowly The amplifier LOAD control needs to be advanced to a higher number if this condition occurs Non linear operation splatter and excessive grid c...

Страница 23: ...nerate high level RF pulses when first keyed These short duration pulses may greatly exceed the exciter s steady state operating output power Unexplained activation of the grid overload circuit may in...

Страница 24: ...ht and the plate current Ip on the left meter should be close to zero 0 8 With the exciter in the transmit mode apply a very low amount of RF drive power about 100 mW The plate current Ip should sudde...

Страница 25: ...be allowed to go above 100 mA at this stage The plate current should not be allowed to exceed 1 5 ampere during brief periods of tuning 30 seconds 11b Increase the exciter drive power if the ALC is n...

Страница 26: ...e flat topping and splatter with only a few hundred watts of RF output NOTE Always remember that the LOAD control setting is much more important than any other parameter for good linearity To maintain...

Страница 27: ...eration Commonly available vacuum relays are specified at 5 to 7 milliseconds of switching time Even expensive vacuum relays are less than ideal for high speed QSK operation At 60 WPM less than 50 of...

Страница 28: ...plifier 6 ALWAYS be cautious of heat Many components inside the amplifier operate at high temperatures 7 NEVER make any unauthorized component or circuit modifications to this product The only accepta...

Страница 29: ...22 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 3 ohm 2 W 1 103 3400 R107 13...

Страница 30: ...5440 5 75 405 1057 270 208 5775 15 17 220 208 5175 3 75 405 1037 150 208 5175 10 12 220 208 5175 4 75 405 1047 180 208 5396 Ameritron part numbers parenthesized Meter Board 50 0800 3 Designator Descr...

Страница 31: ...l op amp 311 0724 Q501 NPN transistor MJF3055 305 3055 Q502 504 PNP transistor 2N3906 307 0722 Q503 505 NPN transistor 2N3904 305 0645 R501 503 10k 1 2 W 101 0643 R504 505 3 3k 1 4 W 100 0729 R506 508...

Страница 32: ...oard Assembly 50 0800 3 50 0080 4 RF Tank Board Assembly 50 0800 4 50 0117 2 Timer Overload Board Assembly 50 0117 2 L1 L Coil 10 13800 LC L2 LF Coil 10 13800 LF L3 HF Coil 10 13108 M1 Meter current g...

Страница 33: ...z 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...

Страница 34: ...AL 800H Instruction Manual 30 Notes...

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