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Ehrhorn Technological Operations ALPHA 76A, Operating And Technical Manual, Page: 1 / 19

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Ehrhorn Technological Operations ALPHA 76A Operating And Technical Manual Download Page 1

O PERATING   A N D   T E C H N IC A L   M A N U A L

HIGH  FREQUENCY  LINEAR  POWER  AMPLIFIERS

A L P H A   76A,  76PA,  and  76CA

[ 0   E H R H O R N   T E C H N O L O G I C A L   O P E R A T I O N S ,   IN C .  

CA Ñ O N   CITY,  COLORADO 81212

Summary of Contents for ALPHA 76A

Page 1: ...OPERATING AND TECHNICAL M ANUAL HIGH FREQUENCY LINEAR POWER AMPLIFIERS ALPHA 76A 76PA and 76CA 0 E H R H O R N T E C H N O L O G IC A L O P E R A T IO N S IN C CA ON CITY COLORADO 81212...

Page 2: ...kW i n p u t 6 Operating notes 7 Troubleshooting hints 8 SECTION 4 THEORY OF OPERATION 9 SECTION 5 ILLUSTRATIONS 11 Transformer access and location 11 Rear panel view of amplifier 11 Top view showing...

Page 3: ...all the 1 4 20 bolts and washers provided and tighten Check both pairs of connectors visually for proper mating orientation avoid excessive harness bending or twisting as it may cause damage to wires...

Page 4: ...dition with no short across its RELAY line the RF OUTPUT connector is internally connected d i rectly to the RF INPUT providing normal transceive type antenna input to the receiver ALC For use with tu...

Page 5: ...ll scale CM Selects lower plate voltage optimum for CW FSK SSTV and other types of emission including SSB up to 1 kW d c plate input SSB Selects high plate voltage for up to 2 kW PEP SSB plate input O...

Page 6: ...une up should be to set excitation drive from the exciter or transceiver so that the GRID current meter indication just reaches about 50 mAdc 1 3 scale key down or on SSB voice peaks b INITIAL TUNE UP...

Page 7: ...is required for CW FSK SSTV operation except to check exciter r f output under operating conditions to insure that plate current is as desired Also press GRID and check that grid current does not exce...

Page 8: ...120V operation Standard glass fuses of the same size are rated for circuits up to 32 V only and may shatter or explode within the fuse holder The slo blo fuse F3 located just behind the front panel p...

Page 9: ...ply D107 D108 or Cl08 or HV fault Defective reed relay K6 Defective Q101 Q102 or Cl09 R116 open or damaged Bias zener DUO damaged or open R116 damaged or open grid current will indicate very high as i...

Page 10: ...i e the threshold ALC level is set by rear panel potentiometer R209 which appropriately back biases D203 Relay K4 switches the antenna straight through to the exciter when the ampli fier is OFF or in...

Page 11: ...comes more positive than its gate At that point Q101 turns on abruptly triggering SCR Q102 which activates relay K6 Until K6 closes the amplifier is locked in the STANDBY condition since T R relay K4...

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Page 14: ...TO POWER SUPPLY...

Page 15: ...tHRHORN TECHNOLOGICAL OPERATIONS INC I MODELS PA 76A 76P CA ON C I T Y CO 8 1 2 1 2 DRAWING ALC WATTME...

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Page 18: ...N O T E S ALL I N T E R F ALL R ES IS TO...

Page 19: ...90 2C 120A or equivalent K2 DPST 24VDC c o il Guardian 1395 2C 24D or equivalent K3 KV relay 24 VDC coil P B PRD11DY0 24 or equivalent K4 DPDT 10A 24VDC coil Mag necraft W88 or equivalent K6 5VDC c o...

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