In principle, any *odd* multiple of 4.118 MHz (the frequency where the cable is 1/4 wavelengths long) will work when the far end of the cable is open-circuited. If you short-circuit the far end of the cable, then look for X=0 at *even* multiples of 4.118 MHz.
73, John W1FV -----Original Message----- From: Topband [mailto:topband-boun...@contesting.com] On Behalf Of Ed Stallman Sent: Tuesday, July 12, 2016 11:05 PM To: Topband Subject: Topband: Cutting Delay Lines I'm cutting a 40 degree and a 20 Degree Delay line using RG6 at 1.83MHz for a receive 8 circle array ! I know the velocity factor of the RG6 and have all the math worked out . After doing the calculations and trimming the RG6 back , I'm looking for X=0 at 4.118 MHZ ( or as close to X=0 as possible ) Now to my question: I'm finding the X=0 to be a broad range , looks to be + - 50 KHz on my MFJ 259b .. I know , I need a better analyzer ... Can I double of quadruple the frequency to narrow the span where X=0? Thanks Ed N5DG --- This email has been checked for viruses by Avast antivirus software. https://www.avast.com/antivirus _________________ Topband Reflector Archives - http://www.contesting.com/_topband _________________ Topband Reflector Archives - http://www.contesting.com/_topband
