From: Ken Shutt [email protected] Kyle,
I would recommend putting the preamp as close to the antenna as possible. The diplexer should go between the radio and pre amp. If you are planning to feed dc to the preamp on the coax, you need to make sure the diplexer will pass the dc to the preamp.
73 de Ken W5KQ
Hi Ken, I think Kyle is wanting to use the diplexer as a high-pass filter in front of the preamp to prevent the 2m uplink signal from overloading the preamp, as explained at http://www.amsat.org/amsat-new/articles/Mode-J/ .
73, Drew KO4MA