Hi all can anyone help please. I mainly operate SOTA and like to build my own antennas. Last week I saw the sotabeams mountain tuner. It looks like it is no longer for sale anywhere so I decided to bake my own.
The variable capacitor is 0-270 pf and the toroid is a T50-6. I followed diagrams that I found online. Testing I used a 4700 ohm resistor and I was happy with the results.
Today I started adding the various lengths of wire. I am using the thin yellow wire that you can purchase from sotabeams sorry forgot what it’s called.
The lengths are as follows:
17M is 7.9m
20M is 10.1m ( an additional 2.2m)
30M is 14.2m ( an additional 4.1m)
40M is 20.3m ( an additional 6.1m)
This is what found online.
I used the first length and managed to get an swr at 1.31 which I thought looks ok. The problem started on the next length as I could not get any swr lower than 22. I then swapped the connection lead from red to the black and black to the red so basically the counterpoise and antenna around. This then let me have 1.04 swr.
This seamed to be the same on every other band.
Any help please.