I don't know what is wrong here but I keep getting in this situation where my typing starts running back over my writing. I will try again to reply.
Joel, I have tried all that the manual says without success. All I see is the horizontal solid and dashed lines of R and X. No indication of a resonance point anywhere from 1880 KHz up to 10,500 KHz. Go figure? At least my mfj-259b is working old as it may be. Rig Experts is going to get a nasty note I think. Disappointing, huh? Terry KI7M > On June 9, 2018 at 2:54 PM Joel Harrison wrote: > > > Hi Terry, > > I replaced the 1/4 lines on my 80 meter 4 square this past fall and used > my AA-170 to set the length with no problem. > > Just select "all" for the mode and set the freq you're aiming for and then > trim the line until X equals zero with the far end open. Should work fine. > I always calculate the length x VF then add a few feet to start. > > 73 Joel W5ZN > > > > Hi guys and gals, > > > > > > I have got DX Engineering 75 ohm foam coax to make the > > stubs/feeders for > > my Comtek 80 meter 4-Square and am finding some difficulty. Neither > > my > > MFJ-259B nor my Rig Experts AA-170 seem to indicate a 1/2 WL at > > 7500 KHz > > or a 1/4 WL at 3750 KHz? Or any frequency up or down from there. > > Seems to > > me the last time I did this a few years ago I didn't have a problem > > getting a 1/2 WL dip indicating a resonance location. But now I > > just don't > > get any indication of a resonance. > > > > > > DX Engineering said they had got some 75 ohm foam coax that instead > > of > > 0.84 VF was more like 0.80 down to 0.76 VF. But checking all the > > way down > > to 6000 KHz on 40 meters or 2500 KHz on 80 meters fails. > > > > > > My test is to use either antenna analyzer with a PL-259 installed > > at one > > end and an open or a short at the other. I started with 57'7" of > > coax. > > Tried both with the coax in a roll and strung out. What am I doing > > wrong? > > > > > > Terry > > > > KI7M > > > > 😞 > > _________________ > > Topband Reflector Archives - http://www.contesting.com/_topband > > > > > > _________________ > Topband Reflector Archives - http://www.contesting.com/_topband > _________________ Topband Reflector Archives - http://www.contesting.com/_topband