|ETO Ehrhorn Technological Operations Alpha 91ß Amplifier|
ETO Ehrhorn Technological Operations
|Description||HF LINEAR POWER AMPLIFIER|
The ETO 91/3 is a self-contained, HF linear power amplifier capable of continuous operation at 1500 watts peak power output on SSB, keyed CW, SSTV, RTTY, digital modes or AM, with no time limit. If periods of "con tinuous-key-dcrwn" carrier operation will exceed 5 minutes, the optional auxiliary cooling fan available from ETO must be installed to avoid possible damage not covered by the warranty. As shipped, units delivered within the USA and its territories are manually tunable to cover all HF amateur bands from 1.8 to 14.35 MHz, with extensive out-of-band capability for operation on MARS, etc. Appropriately-licensed users may contact ETO for information on modifying domestic amplifiers to extend coverage to 29.7 MHz.
These manuals are available for the above equipment:
|ETO Ehrhorn Technological Operations -- Alpha 91ß -- Service and User Manual|
|Manual Type||Service and User Manual|
|Size||944.61 Kbytes (967285 Bytes)|
|Quality||Scanned document, all readable.|
|Upload date||27 April 2014|
|Downloads||241 since 27 April 2014|
CRITICAL PRECAUTION DURING INSTALLATION 1 Section 1 INTRODUCTION 1 General Description of the ETO 91/3 Amplifier 1 Specifications, ETO 91/3 1 Figure 1 Top View 3 Section 2 PREPARING THE ETO 91fi FOR OPERATION 4 Transformer Installation 4 Inspection of Tubes & Chimneys 4 AC Primary Connections & Amplifier Grounding 4 Operation from 90-130V mains 5 Figures 2-4 Transformer 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 Tune-up 9 1. Turning On the Amplifier 10 2. Tuning Up for Operation at 1,500 Watts RF Output 11 4.3 Reflected Power Protection 12 4.4 ALC 12 Section5 OPERATING AND MAINTENANCE NOTES 13 Tubes 13 Fuses 13 Electronic Bias Control 14 Plate Overcurrent Relay 14 Preventive Maintenance 14 Section 6 TROUBLESHOOTING HINTS 15 Section 7 DESIGN AND CIRCUIT OVERVIEW 17 SCHEMATICS 19
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