Just go get some 1/2 suplerflex and call it good. Willis M. Hagler wrote: > > > Hello All, > > I am putting up a UHF repeater in Seattle and have a question > regarding feedline losses. The repeater site is on top of a > building and the distance from where the repeater/duplexer will be > located is less than 25 feet of coax distance away from the antenna > mount. > > Of course I would like to reduce the system losses as much as possible > so I'm willing to pay for ~25 feet of 7/8" Heliax. However my > question is more about the loss experienced with inter-series > connectors in the feedline. > > The 7/8" Heliax is not very friendly to bend and route into the > cabinet for direct connection to the duplexer, so every repeater I've > seen has a short chunk of something more friendly like RG-214 going > from the duplexer, through the cabinet, and then joins to the Heliax > with some kind of N-male/N-male adapter. > > What kind of signal loss occurs through such an adapter at 442mhz? On > such a short run am I losing more signal through a Male/Male adapter, > such that I just may be better off running a single segment of RG-214 > the entire 25 feet? > > As far as I can tell, 25 feet of RG-214 would be about 1.28 dB of > loss, while 25 feet of LDF5-50a Heliax would be as low as 0.2 dB, but > if a single Male/Male adapter causes anything close to 1 dB of loss > than it seems like a wash to me... > > Thanks for any advice. > > 73 and Merry Christmas to everyone. > > Mark Hagler > W7WMH Seattle
-- Jay Urish W5GM ARRL Life Member Denton County ARRL VEC N5ERS VP/Trustee Monitoring 444.850 PL-88.5
