ETO Ehrhorn Technological Operations - Alpha 78 - Amplifier
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ETO Ehrhorn Technological Operations Alpha 78
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Equipment:
Alpha 78
Date:
1979
Category:
Group:
Sub Group:
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.
1 Manual
Service and user manual
Manual type:
Service and user manual
Pages:
37
Size:
2.1 MB
Language:
english
Revision:
Manual-ID:
Date:
Quality:
Scanned document, all readable.
Upload date:
April 27, 2014
MD5:
7315d510-05ed-f331-c6e5-9dd879329d41
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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