Just a thought, Why dont you turn the pistons around to give you a longer reach?
Ian G8PWE ----- Original Message ----- From: "Burt Lang" <b...@gorum.ca> To: <Repeater-Builder@yahoogroups.com> Sent: Saturday, July 17, 2010 4:08 PM Subject: Re: [Repeater-Builder] Re: Invar Rods > What diameter are the rods? The older Sinclair VHF Hi cans used 5/16in > diameter whereas the newer cans used 1/4 in daiameter. > > burkleoj wrote: > > Glenn, I need 6 of them for a Sinclair duplexer that I have. > > > > Someone cut the rods off when it was originally on a commercial > > frequency. The rods in my duplexer are so short that it will not tune > > below 147 MHz before they disappear inside the top of the cavity. > > Very common when the frequencies are in the high 160s > > > > > I can get some dimensions for you to see if the ones you have may > > work. > > > > Thanks, Joe - WA7JAW > > You can buy invar rod material from some metal suppliers but you won't > like the price. It normally comes in 12ft lengths but the dealers will > cut it in half in order to ship UPS. The last time I bought some (around > 1990) the price was $30/lb. The dealer was Diezel (or Diesel) Metals on > Long Island somewhere. I still have some left from that order. > > FYI Invar is an allow consisting of exactly 35.16% nickel with the > remainder iron. It is magnetic and will corrode in a damp environment > leaving a green "rust" on the surface. > > Burt VE2BMQ > > > ------------------------------------ > > > > Yahoo! Groups Links > > >
