RE: [Repeater-Builder] Invar Rods

2010-07-15 Thread ka9qjg
Glen , I know some will think If I am to dumb to know what they are , Then I do not need them . But I still would like to know in layman terms what is a INVAR Rodif I was guessing Maybe something that goes in a duplexer Thanks Don KA9QJG From: Repeater-Builder@yahoogroups.com

Re: [Repeater-Builder] Invar Rods

2010-07-15 Thread DCFluX
Invar is a special material. It is special that is has very low tempreture expansion characteristics. When used for the tuning rod in a duplexer it will compensate the expansion in the copper center conductor so that the frequency of the cavity does not drift. I calculated a 6m cavity that uses