You can buy special RF relays for this very purpose, a lot depends on the frequencies and powers involved, but they usually have some kind of coaxial connectors on them and are fully screened.mylond said:I'm trying to build a remote antenna switch. what's the best relay (manufacturer) for better rf shielding. any help or schematic is wellcomed.
Another possibility is PIN diodes instead of relays, a lot depends on what it's actually for, he doesn't mention if it's for transmitting or just receiving, and if transmitting, what sort of powers are involved.stevez said:I've seen what appear to be standard relays used for RF in quite a few things. As Nigel points out, it all depends on the frequency. Still, I see common relays in use in RF circuits of VHF equipment. It looks like LDG and other automatic antenna tuner mfrs use common relays. My guess is that they don't perform as well but in some applications the losses are acceptable. Coaxial RF relays are very expensive too. I've wanted to build up some remote antenna switching units and thought about trying to measure the losses, mismatch, etc of low cost, common relays at 30 mHz and below. Would be nice if someone has already done that.