[TowerTalk] Help need Vacuum Relay Isolation 1.8 to 30 MHz

[Tom Rauch]

Hi Rich,

If the wiring is what it sounds like to me, you are really
setting yourself up to eventually seriously damage your
radios.

> Two relays mounted next to each other in an aluminum box.
No shielding
> between the relays. Both normally open. Connect one
terminal from each relay
> together and to an SO-239 connector feeding outside the
box to a 50 ohm
> dummy load.

What happens if one relay sticks and does move, has an open
coil and doesn't move, or a wire breaks? What happens if you
get a short someplace? What happens if a contact welds?

Look carefully at your contact wiring. If there is ever a
possibility a relay or electrical failure can cause two
radios to connect to one antenna port, I'd strongly suggest
you buy different relays!!

If you intend to build a crossover switch, you should at the
very minimum use a DPDT relay that has a reliable armature
that is always synchronized.

73 Tom