Alpha Power ETO 91B User Manual Download

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a n u a l

HF LINEAR POWER AMPLIFIER

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ALFHA/powER>

IN C

RF Power for Communications and Industry

I l L i n B 14440 Mead Court, Unit B, Longmont, Colorado 80504
p p | 4 * * (970) 535-4173 * FAX (970) 535-0281

Summary of Contents for ETO 91B

Page 1: ...M a n u a l HF LINEAR POWER AMPLIFIER Q ib u nA L F H A p o w E R IN C RF Power for Communications and Industry I l L i n B 14440 Mead Court Unit B Longmont Colorado 80504 p p 4 970 535 4173 FAX 970...

Page 2: ...former Installation 6 Section 3 AMPLIFIER STATION INTERCONNECTIONS 7 Coaxial Cable Types Connectors 7 T R Control Cable 7 ALC 7 Figure 5 Back Panel 8 Section 4 OPERATION 9 4 1 Control Functions 9 4 2...

Page 3: ...sof continuous key dcrwn carrier operation will exceed5 minutes the optional auxiliary coolingfan availablefrom ETO must beinstalled toavoidpossibledamage not covered by thewarranty As shipped units d...

Page 4: ...C21 C24 C20 C26 under Power Supply Board PS J1 J2...

Page 5: ...L4 BL1 HV Crowbar Vacuum Relay Power K2 Relays P1 XFMR T i S3 Interlock Figure 1 9ip Top View...

Page 6: ...with strip wound Unisil H R core Protective Functions Primary and step start fuses primary AC interlock high voltage crowbar peak and average plate overcurrent trip outs arc protection trip reflected...

Page 7: ...and fully installed so that the bottom of each chimney is firmly againstthe tube deck and completely covers the airflow openings in the deck Tube cooling air must exit only through the tube anode fin...

Page 8: ...mumpeakpoweroutput toabout 600 1000 watts Maximum possible RF output power for any particular primary AC voltage and cur rent capacity may be estimated as Po max Vline x Dine 2 3 For example if the 91...

Page 9: ...3A AC CONNECTION VIEW A A HIGH AND LOW VOLTAGE BOARD CONNECTIONS HV CONNECTION VIEW A A L V CONNECTIONS VIEW A A FIGURES 2 4 91 TRANSFORMER INSTALLATION...

Page 10: ...FIGURE 5 91B REAR PANEL...

Page 11: ...g and the other end with a plug suitable for the trans ceiver usually supplied with the transceiver The T R relay contact must close before application of RF drive 91 3 protection circuitry prevents h...

Page 12: ...er OPR STBY OPeRate places the amplifier in line With the 9l off in STandBY or in warm up with the WATTLED lighted the amplifier is bypassed and the exciter is connected di rectly to the antenna Meter...

Page 13: ...put consistait with good linearityoccurs when the green GRID LED lights on most voice peaks and the red LED flickers dimly only on the highest peaks Excessive grid current results from overdrive and o...

Page 14: ...Up for Operation at 1 500 Watts RF Output 1 Preset BAND TUNE and LOAD controls to the nominal positions given in TABLE I below TABLE I Preliminary Tuneup Settings Frequency Band Tun Lo d 1 8 MHz 1 8 9...

Page 15: ...tput 4 3 Reflected Power Protection While operating check the bargraph to ensure thatreflected power remains below about 165 watts peak 2 1 VSWR when amplifier outputis 1 500 watts Fluctuating reflect...

Page 16: ...tage to chassis whenever the cover is lifted These interlocks are designed to protect against dangerous electric shock resulting from accidental contact with potentially lethal voltages inside the amp...

Page 17: ...example a TUNE or LOAD variable capacitor and automatically switches the 91 3to standby within a few milliseconds This system has virtually eliminated RF arc damage in current ETO amplifiers The syste...

Page 18: ...on but time delay will not complete WAIT LED does not turn off 1 Defector damage in timing circuitry on control board E Amplifier turns on time delay completes but amplifier will not transmit 1 Open...

Page 19: ...r unshielded station patch cables 4 Poor station RF ground K Low frequency audio hum on transmitted signal 1 Defective microphone cord especially broken ground lead 2 Dynamic magnetic microphone locat...

Page 20: ...MHz amateur bands Two section TUNE and LOAD capacitors C20 and C26 are switched to provide an electrical vernier for smooth easy and accurately resettable tuneup by the numbers on all bands Power Sup...

Page 21: ...atlower right and keying switching functions at upper right Front Panel Displays Figure 8 The Display Board located on the rear side of the 9l front panel incorporates all indicator LEDs and their as...

Page 22: ...91fi SCHEMATICS 19...

Page 23: ...iaa ieavA C 2 0 0 2 5 0 V A C XXXXX C O N T R O L B U S S L_ L_ B i_ sL _ B 2 a_ a_ A 3_ 3 3 A A 4 A 4 A 4 B T 5_ B 5_ 5_ 5 L6_ 7 lJ7 7 _ 2_ 9 0 1 1 0 V...

Page 24: ...D L O C K p L C 2 6 B 7 4 2 5 p F C 2 5 1 5 n F l k V B K l B f l p T f ci leg Ic3 P AD c JcsJ c6_1c 7_ ce C A P P C B A T g g n h b u u v Ir h R F F IL g P C X c x x O e CI 2 2 n F 5 0 0 V HV GND J 4...

Page 25: ......

Page 26: ...B R E A K D 23 T G U N LO C K 10 M E TE R S FIGURE 7 91 CONTROL BOARD...

Page 27: ...P E R 10x2 C 1 2 c 3 4 c 5 6 c 7 0 c S 10 c 11 12 c 13 14 c 15 16 G 17 10 19 20 T O n z P EA K F V D G U T R EF L M E T E R GNP GNP i2v C F A U L T L E P 1 P L E P M U L T I M E T E R QPR LETD 5V F A...

Page 28: ...FIGURE 8 91 S DISPLAY BOARD...

Page 29: ...er FIGURE 9 91 POWER SUPPLY BOARD...

Page 30: ...R13 J1 FIGURE 10 91 3 HV FILTER SCREEN SUPPLY...

Page 31: ...FIGURE 11 91 INPUT BOARD...

Page 32: ...FIGURE 12 91 OUTPUT RF WATTMETER FIGURE 13 91 MULTIMETER SWITCH...

Page 33: ...l number plus details of equipment hookup acces sory equipment used operating conditions and abnormalities observed API will furnish a new part in exchange for any covered defective part or if it is d...

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