50 & 144 MHz Power Amplifier - based on the YU1AW  GS-31B tube -design.

Design goals:           

-    Simple, reliable and rugged construction, based on previus experience...
-    Ease of operation; all controls and indicators located on the frontpanel...
-    Recieve capability on both bands when amplifier is standby...
-    Medium level automation provided by build-in control circuit...
-    High level protection of amplifier and operator...
-    Operation and Service manual in PDF file format...
-    Buildtime not to exceed 4 months; finished by 04-mar-2004...

Technical Specification:

-    Drive power:              50 watt        Both bands
-    Output power:        1200 watt        Both bands
-    Iplate:                      800 mA
-    Uplate:                   2500 Volt 
-    Weight ~25 Kg (50 pounds)
-    H x W x D ~20 x 40 x 43 cm (7.8" x 15.75" x 17")

-    Other tube specs. not to be exceded...

Build-in controller functions:

-    High Voltage on delay 3 min.
-    High Voltage soft start-up
-    Filament soft start-up
-    Blower off delay 5-10 min.
-    Iplate trip   >  900 mA
-    Uplate trip < 1800 V
-    Igrid trip > ??? mA
-    VSWR trip > 1:2
-    RX-TX sequenser

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