ETO Ehrhorn Technological Operations Alpha 78 Amplifier
Manufacturer:
Model:
Alpha 78
Date:
1979
Category:
Group:
Description:
HIGH FREQUENCY LINEAR POWER AMPLIFIER

Information

The Alpha 78 is a self-contained, high frequency linear power Amplifier capable of continuous operation at input powers in excess of two kilowatts PEP/SSB and one kilowatt average or continuous carrier, with no time limit. It is manually tunable from 1.8-2.0 plus 3-22 MHz, optimized for convenience in the 160 through 15 meter amateur bands (export models also cover 10 meters). Four additional bandswitch positions provide NO-TUNE-UP operation at full legal power on the 80 through 15 meter amateur bands. The ALPHA 78 is capable of high speed break-in CW (QSK) when used with a Transmitter or Transceiver of suitable break-in capability. The Alpha 78 also incorporates a feature permitting optimization of efficiency in either the CW or "phone" subband when using the NO-TUNE-UP feature on 80/75 through 15 meter amateur bands.

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Service and User Manual
Manual type:
Service and User Manual
Pages:
37
Size:
2.06 Mbytes (2161069 Bytes)
Language:
english
Revision:
Manual ID:
Date:
Quality:
Scanned document, all readable.
Upload date:
27 April 2014
MD5:
7315d51005edf331c6e59dd879329d41
Downloads:
553

Information

SECTION 1 - GENERAL DESCRIPTION 6 SPECIFICATIONS ... 1 SECTION 2 - INSTALLATION Electrical Installation (AC Power Connections, etc.) ... 3 RF and Control Connections ... 4 SECTION 3 - OPERATION Control Functions ... 8 Tune-Up Procedure ... 10 Bandpass Operation ... 10 Manual Tune-Up Operation ... 12 Break-In (QSK) ... 14 Operating N o t e s ... 1*+ Troubleshooting Hints ... 16 SECTION 4 - THEORY OF OPERATION RF Section ... ... 18 Power Supply £ Control Circuitry ... 19 Break-In (QSK) System . ... 21 SECTION 5 - ILLUSTRATIONS Photographs, Top and Rear V i e w s ... 23 Photographs, Power Supply and Circuit B o a r d s ... 24- Schematic Diagram, RF S e c t i o n ... 25 Schematic Diagram, Power Supply 6 Control Sections ... .26 Schematic Diagram, QSK (Full Break-In) T/R System ... .27 Schematic Diagram, ALC/Wattmeter £ Switching ... . 28 SECTION 6 - STANDARD ELECTRICAL PARTS LIST ... 29 ET0/"ALPHA" PRODUCTS WARRANTY ... BACK COVER

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