Equipment information

ETO Ehrhorn Technological Operations Alpha 78 Amplifier
Manufacturer
ETO Ehrhorn Technological Operations
Model Alpha 78
Date 1979
Category: Radio, Communication
Group Amplifier
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.

These manuals are available for the above equipment:

ETO Ehrhorn Technological Operations -- Alpha 78 -- Service and User Manual
File name Alpha-5844-Manual-Page-1-Picture
Manual Type Service and User Manual
Pages 37
Size 2.06 Mbytes (2161069 Bytes)
Language english
Revision
Manual-ID/Number
Date October 1979
Quality Scanned document, all readable.
Upload date
MD5 7315d51005edf331c6e59dd879329d41
Downloads 135 since 27 April 2014
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
Alpha-5844-Manual-Page-1-Picture
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