18 Watt Amplifier for 23cms using Mitsubishi Modules. This
amplifier uses an M67715 and an M57762 linear amplifier modules to produce 18-20 Watts on 23cms (1296MHz) for an input drive signal of about 5mW.
Although fairly conventional in design, the amplifier uses a "dead bug" method of construction more usually found at frequencies in the HF region or below. The power and bias pins of the modules were connected to small pieces of copper laminate board epoxyed to a thin sheet of tinned copper which acts as the ground plane and negative supply.
However, very short direct connections were made to the RF Input and Output pins using coaxial cable, the screens of which were directly connected to the ground plane adjacent to the input or output pin. Also good quality microwave ceramic chip capacitors made by American Technical Ceramics (ATC) were used for decoupling the power and bias pins. This ensures that the amplifier is stable, and that the gain obtained is in accordance with the manufacturer's specifications
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Page last updated 29/1/2002