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Don sent me a photo composite of his rig - you can click on it to view the full image. For those who do not have access to a mill and metal lathe, you can take Don's approach by drilling the base of the feedhorn for four screws and making a shorting plate to mount on it. You will find there is just enough room for a 2 hole mount SMA connector - See the photo. The SMA pin should be the .050" size and it needs to be centered .440" from the shorting plate and needs to be .245" in length inside the circular waveguide. Don did not bore out the feedhorn - just used it as is.
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