Thanks everyone for the replies, I'm new to all this so you may go easy on me, I don't understand this R+JX stuff so I need a dummies guide if possible,
I have the vertical section at the top of the coil and I connect the feed line to it where I can get the lowest SWR at 1.825mhz, Does the amount of coil left under the tap matter I didn't know it would as it's going to ground, Ideally I don't want to drop the loading wires as they are not easy to get to but I can if I need to, Thanks Trevor ----- Original Message ----- From: "Richard (Rick) Karlquist" <[email protected]> To: "MR TREVOR DUNNE" <[email protected]>, "topband List" <[email protected]> Sent: Wednesday, 1 November, 2017 17:25:25 Subject: Re: Topband: 160m Vertical matching Help You need +j34 ohms in parallel with your coax coming in. This is about 3 microhenries. This would be around 6 turns on your coil if the turns are spaced a wire diameter. IOW, tap the coax 6 turns from the grounded end. Then tap the antenna to whatever tunes to 1.83 MHz. Rick N6RK On 11/1/2017 9:54 AM, MR TREVOR DUNNE wrote: > > Hi All > > > > I finally got the vertical up and running, problem I have now is I can't find > a low SWR on the coil, the best I can get is about 2.8:1 no matter where I > tap the coil that's the best SWR, I can move that point up and down the band > by moving the tap but the SWR stays the same, > > My current set up is about 55ft vertical I have 2 loading wires in a T shape, > wires are 50ft either side of the vertical and the are pretty level and in > line, > > I have 38 radials averaging about 45-60ft long, I will add more when time > allows but don't the make the SWR worse ?? > > With no coil I get resonance at 2.12mhz with R=16 X=2 on my MFJ269, > > The coil is 25ft of 5mm copper brake pipe in a 4" diameter, the coil is > attached to base of the vertical and the other end is grounded, > > Any pointers on what I can do to get a better match, > > Thanks > Trevor > EI2GLB > _________________ > Topband Reflector Archives - http://www.contesting.com/_topband > > _________________ Topband Reflector Archives - http://www.contesting.com/_topband
