[amsat-bb] 70cm high-pass filter designs

Hi all,

My portable satellite station consists of a Funcube Dongle Pro+ for RX and a FT-817ND for TX. I use a diplexer in front of the dongle to avoid desensing, but still some of the 2m signal is getting in and causing desensing when working V/U birds. It seems to me that a 70cm high-pass filter in the receive chain would help.

Can anyone point me to some easy to build reference designs for this kind of filters? Power handling is not an issue, since this will only be used for RX. I'm mainly looking to something that I could build from things in my junk box, using air core inductors and ceramic caps (if this a sensible thing to do).

73,

Dani EA4GPZ.