I'm planning to try an 80m dipole fed with Radio Shack 300 ohm twin-lead for Field Day. I only plan to run QRP so power handling is not a consideration. In using the method on p.34 of April 2004 QST,
Perhaps the dielectric loss isn't the dominant effect. Looking at the tables in XLZIZL, it looks like the big change between generic 300 and generic 450 (which calculate out to the numbers you give i
Bill, The primary loss mechanism in any transmission line cable with even a reasonable dielectric at HF is conductor loss. Foam or air dielectric allows the conductor size to be increased for a give
Hi Bill, Using Keven Schmidt's TL Calculator http://fermi.la.asu.edu/w9cf/tran/index.html I got 0.39 dB/100' for 450 ohm windowed line and 0.54 dB/100' for 300 ohm tubular line. This is about what yo
At 01:16 PM 6/13/04, you wrote: Belden lists 22 AWG 300 ohm line as 1.4dB/100 ft at 100Mhz while stepping up to 20 gauge reduces loss to 1.1dB/100ft @ 100MHz. That's the only data I have here in my c