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