Thank you to everyone who replied - I received much very good advice about how to determine the relay characteristics that I need, how to mount the relays and specific relay recommendations.
Thanks again and 73, Bob W1SRB -----Original Message----- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Solosko, Robert B (Bob) Sent: Tuesday, February 19, 2008 1:00 PM To: [email protected] Subject: [Elecraft] OT: Relays for antenna switching Hello All, I planning to put up a 20m switchable vertical yagi made up of 4 vertical elements, with a relay control box to switch the elements to be either the driven element or the reflector elements. Preferable the relays should be DPDT, although I can use SPDT relays if they're cheap enough. - What relays should I use (any specific recommendations?) , or what characteristics should I look for in relays. The relay control box will be mounted on the antenna, so it has to operate over a very wide range of temperatures (below 0 to over 100 degrees), and be controlled via 12VDC. - What should the relay contact rating be to use with my K2 at 100 watts? - Will there be a significant amount of loss if I use power relays for RF applications (which seem to be the only ones in the catalogs that probably have a sufficient contact rating)? - Are the relays used in the KAT100 appropriate for "external" use (they would be in mounted a sealed box)... and does anyone know what the KAT100 relays are? (I expect the Elecraft would prefer that I order them from some othe rsource so that they're not a parts supplier for non-Elecraft projects). Thanks. Bob W1SRB _______________________________________________ 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 _______________________________________________ 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
