The mast of my RX flag is 20-25 ft from my 160/80m shunt fed tower. I run a KW+
on the low bands. I use an Array Solutions AS-RXFEP RF Limiter (aka FES etc.)
in line with the flag at the rig’s RX Ant IN. The RXFEP uses a gas discharge
tube and a pair of matching transformers with back-to-back diodes in between.
I favor this passive approach which avoids having to deal with any relay and
sequencing issues when QSK.
https://www.arraysolutions.com/Products/as_rxfep.htm
The “manual” link shows the schematic.
I also use a W3NQN BCB filter (from AS).
I have had my K3’s COR (carrier operated relay) trigger on 80m depending upon
the orientation of the flag. A not so obvious RF path of some sort. This issue
was solved by placing the BCB ahead of the FEP.
I recommend the RXFEP if you want a passive non-relay solution. If you have
strong local BC stations, the W3NQN brick wall BCB filter works wonders.
Steve WB6RSE
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