As I worked on building a PA like Peter's, I found that it would be better with more Power Output when operating EME. The case I found matching my needs for building the PA could contain 2 complete 500 Watt PA's on the cooling unit.Here is a picture of the case I found:

The PA needed a Power Supply and from a friend I got 2 Units taken from Equipment that is not used anymore.Here is the Power Supply:

Only one thing was nor good.The Voltage was to high for the FET's.I needed to get it from 52 Volt to under 45 Volt's.To get a lower voltage, there must be a resistor changed.Here is a picture of the open Power Supply:

In the middle of the picture you can see a red rectangle that shows this:

The resistor in the red rectangle is from manufacturer 330 Kohm - I changed it to 270Kohm. Now the voltage is 43 Volt.

Here the 2 Power Supply units are placed in the Case:

When using 500-600 Watt's PA, there is some heat to get rid of.I found 2 cooling Units and placed them together, so there could be one PA on each side. Airflow is then in the middle between the two units in form of a tunnel. See this picture from above:

And from the side, where the Airflow is comming:

I then need an opening for the Vent to get fresh air into the Unit.Got a VentShield from a PC Supply:

Now the first side of the Power Amplifier need to be mounted on the cooling Unit. The FET's need a very good heat dispenser, therefore I have mounted Cubberplates under the PCB's to get the heat away.
Here is a picture before mounting PCB's on the cooling Unit:

This is what I have done yet. Next follows the mounting of PCB's. I have stopped a while with the project because I need to finish the other things for my antenna's. I bought two 2x11 elements Tonna that need combiner's / Relay's / Preamp and a new Elevation Antenna Rotor system. So I have a lot to do :-)

Hope to get the PA finish before summer holydays 2008.