In a message dated 11/16/06 1:54:47 PM Eastern Standard Time, [EMAIL PROTECTED] writes:
> The > relays used by Elecraft (Omron G6HU-2) are DPDT and a single relay could > switch both input and output, but I am concerned that the isolation between > the input and output would be comprised by the proximity of the input and > output connections and contacts. My guess is that the the isolation would be compromised, particularly where you need it most. > I could also use one relay at the input side of the filter and another > relay > at the output side of the filter which should have better isolation. > Two relays is definitely the way to go. Since the relays are DPDT, use one pole to switch each end from the filter input to a piece of coax bypassing the filter, and use the other pole to ground the center conductor of the bypass coax when the filter is selected. That way the coax has a harder time acting as a path around the filter. 73 de Jim, N2EY _______________________________________________ Elecraft mailing list Post to: [email protected] You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com
