Making sure that during the SO2R/2BSIQ operations the adjacent radios will not damage each other’s input decided to build RX band-pass filters for both RX paths. Excellent solution was found on RemoteQTH page. Aiming to reach the high attenuation level two units were built back-to-back. However I played a lot with the fine tuning could not really reach better insertion loss values. On 40m the passband transmission loss is even peaking at 4+dB which acts like an attenuator right a way. The 80m and 160m is significantly better. However the high TL was not perceived during the contests compensating the path loss a pre-amp is planned.
