The 2300 -2424 Feed used is scaled from an "RA3AQ" septum feed that was initially optimised for 1296 MHz for an f/d of 0.39 .... 0.45. Tuning screws were required as per the "OK1DFC" septum and with compromised tuning b/w the Rx and Tx ports a Return Loss of 24dB was achieved with a Port - Port isolation of 22dB.
The feed was built out of 0.5mm copper sheet that was bent into the square W/G and the septum was soldered into the middle. The pictures below also show the isolating SMA relay and the 'WD5AGO" preamp on the feed assembly. The 2 brass tuning screws are also visible.
