I have a pair of 220 filters built from 1 5/8 heliax. Seem to work and were added to a small flat pack style mobile duplexer.
On Thu, Oct 22, 2009 at 7:45 AM, Chuck Kelsey <[email protected]> wrote: > While I cannot answer your "will it work" question, I can add an > observation. > > I built a heliax duplexer for 6-meters as well. It worked. However, it was > extremely touchy as far as staying in tune, and mechanical vibration was > part of the problem in keeping it in tune. I am certain that transporting > them (in my case) would have resulted in them being unusable after the trip. > > That said, I have seen some variations to the design that may result in > increased mechanical stability. For me the coax capacitor was real prone to > movement. > > Chuck > WB2EDV > > > > ----- Original Message ----- > From: "Ed" <[email protected]> > To: <[email protected]> > Sent: Thursday, October 22, 2009 10:17 AM > Subject: [Repeater-Builder] 2 meter Heliax Duplexers. Anybody try? > > >> >> Gentlemen >> >> I am brainstorming about constructing a portable - temp use - Pelican Case >> portable 2m repeater using the 6 meter Heliax duplexer concept. >> >> I had built a 6m duplexer for .5 mhz split using this method 12 years ago >> and it worked quite well. >> >> I have built a single cavity 2m notch filter for APRS use, so I believe >> the concept can work. >> >> Has anybody tried building a 2m duplexer using this method that would do a >> 600khz split? >> >> Advice, suggestions? >> >> 73 >> >> Ed N3SDO >> >> > > > > ------------------------------------ > > > > Yahoo! Groups Links > > > >
