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: http://www.antennas-amplifiers.com/Amateur-Projects/Cheap-High-Power-Relay-144MHz-50MHz