This Ultimate-3 unit is fitted into a Gie-tec Proma aluminium housing type EG2 (dimensions 103x56x168mm). The topcover of the housing is replaced by a aluminium grid for better cooling. There is a dual power supply inside (5V and PA). A 5x2 pin header on the PCB of the U3 is mounted to upgrade the U3 Atmel chip (current version 3.05). On the frontpanel is a switch for the background illumination of the display (high-, low intensity and off). The PA stage is equiped with 3x BS170 (individually cooled with a mini heatsink). Their supply voltage (+PA) can be switched with a frontpanelswitch from 5V or 7V to 9V (low-, medium- or high power resp.). A 2.5 mm connector on the frontpanel can be used for a CW transmit key. There is also a TX/RX relay inside with BNC connectors at the backside of the unit. The Ultimate-3 is synchronised externally with the high performance GPS module Skylab SKM52 (fitted in a separate plastic enclosure). It gets the +5V from the Ultimate-3 and is internally stabilised to +3.3 V.
Schematic diagrams and printlayout (except the Ultimate3 part of G0UPL) can be found in subfolder 'Schematic'. RF output measurement results are available in subfolder 'Measurements'.
For reference to the website of G0UPL about Ultimate3 click here