Cheap QRO Relay 50 – 144 MHz by YU1CF

Cheap QRO Relay 50 – 144 MHz with high isolation and „N“ connectors

Intended to switch antenna to QRO or preamplifier without need for another isolation relay.

This relay is good enough to protect any sensitive preamplifier.
Relay is good for HF, VHF contests and for EME.
To make this QRO relay you need:
200W soldering iron to solder „N“ connectors.
60 – 100W soldering iron to help soldering big surfaces.
30W soldering iron.
Please read the full article at YU1CF homepage:
Note: pictures are linked from


Name is Erwin Witt, born 1962, working as technical service engineer in environmental test systems business. Ham radio hobby since 1980, main interests are VHF and EME operating.