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I built this 4-module 100w amplifier assembly to be used as a component in a high-power portable transverter, intending to use it in a rover setup for contesting. Here's some background info on the individual amplifier boards and couplers.
Only 500mw drive is needed for 100w out...300mw would be enough if the on-board input pads are left out; maximum output is 120w (saturated).
In this picture, you are seeing only the left two of the four 30w amplifier boards, with the main input hybrid splitter/coupler and output hybrid combiner/coupler mounted to the top plate. These components combine each of the two 60w sides.
In the next technical
article, I put this inside a transverter
cabinet in it's own compartment (construction similar to the 9cm
transverter), complete with a quiet muffin fan moving air through the fin
cluster in the center.
I attempted to make the heat sink as physically small as possible, yet still be capable of dissipating the heat properly.
To do this, I used two smaller pieces of heat sink, each large enough for a 60w amplifier pair to occupy.
Putting the fins together like this allows air to be directed
easily into the fin cluster, exhausting at the rear of the assembly.
I wound up making the mounting plates a bit wider than you saw in the previous photo; this allows the top couplers and the components on the sides to have some clearance and mechanical protection.
The whole thing is still very compact at 4"W x 4.5"H x 8"L