After having had some trouble with our preamps on Azores 2018 we decided to build a completely new preamp setup for the EA9 activity. Basis are two Tohtsu CZX-3500 coaxial relays. They have an isolation of 65 dB on 2 m and can transfer sufficient power.
We are grateful to Wimo WiMo Antennen & Elektronik GmbH for selling them to us at a fair discount and herwith supporting our activities.