Works great with twin-lead(300/450 Ohm line) and good balanced tuner or good wide-range tuner with 1:1 or 4:1 balun...Has anyone got any input on using a 260’ long dipole cut for 1.8mhz as an all band antenna?
I have my choke right below the balun. And I’m about convinced my mfj balun is goofy. I’ll have new cores tomorrow and just wind my own.
would that be considered a capacitance or inductance antenna? how well did it work?I did a CR dipole once. Build a dipole for the lowest band, then, for your next lowest band, hang a half-wave wire 4" under the first dipole (no connection at feed point). Then, for the next lowest band, hang another element 4" under the previous wire and so on. Only the longest (lowest band) is connected to the coax.
Unless you're going to use band traps, you will immediately run into a problem when you use the antenna on 80M, while on 160M your center-fed dipole is at a current loop, on 80M, each leg is now a 1/2 wavelength, and you are feeding each element at a high impedance point, eg., a voltage loop. So you go from having a feed-point impedance of less than 50 Ohms on 160M, to a feedpoint impedance of a few thousand Ohms on 80M, and every even harmonic thereof.Has anyone got any input on using a 260’ long dipole cut for 1.8mhz as an all band antenna?
love the disclaimer!80m is always tricky with a 160m dipole - but it's not impossible. The "all-band" antenna I use the most (SSB & digital at near FLL) is a 160m dipole.
Disclaimer: I am a fan of 600-Ohm 'ladder line'.
I would suggest looking into the merits of replacing your coax with 600-Ohm feedline. There are fundamental differences between the two that are worth understanding, and many advantages with open line. I believe the most important advantage is the low loss tolerance to high SWR - which means you can ignore high SWR in the feedline (where coax crashes and burns) and only worry about SWR at the transmitter (where your tuner can correct it). KD8NPB shows the loss differential nicely in this post. If you have a balanced line tuner it's a piece of cake. If not, then you need a decent 1:1 current balun with a very short coax to the tuner. KV5R has a great set of tutorials on Ladder Line which I have found invaluable.
Good luck !