[TowerTalk] Help need Vacuum Relay Isolation 1.8 to 30

[Jim Lux]

At 04:22 PM 1/5/2005, OM7ZZ, Jozef Urban wrote:
>Yes Jim.
>Little blue relays are used for switching of power vacuum relays. Principle
>is same as used at serialy produced little brothers of this switches -
>Double Ten and Double Six. Diagram of one port is available at:
>http://www.microham.com/double%20ten%20switch%20features.html
>Strip star cannot be at 50ohm because arms to unselected ports creates open
>stubs and affects matching. Correct impedance is higher and has been
>obtained experimentaly.

Of course.. but, in any case, they are transmission lines, as opposed to 
casually chosen pieces of copper.


>-70dB of isolation is a value who can be obtained relative easy with most of
>relays suitables for RF switching if two are used in line. As Tom said, very
>important is a grounding and proper layout.
>
>73 Jozef OM7ZZ