Yet another antenna experiment
So i changed QTH and now i have space to put up antennas. BTW, in the move i lost my Falcon Outback 2000 “mobile dummyload” which served me so well in my last QTH. Anyway, my first idea was to put the 11m mobile antenna up again, but since all the bands from 20 to 10m are closed now i have to put up something bigger.
In a way the end-fed antennas call to my attention. What to do? Buy one like the HiEndFed 3 band antenna? At the end it’s just a 9:1 unun and a string of antenna wire. So build one? I’ve built so many antennas in the past and nothing ever really worked.
Anyway, so i took the model for the unun of M0UKD’s website and tried to build that one using the toroid Mark PA5MW sent me a long time ago.
I strung a 14m long piece of wire to it and in my test setup i got great results! I had an SWR under 2:1 over the whole band with dips at 1.8, 3.5, 7.2 and 14.3MHz, just where i wanted them to be. But now that i fixed the coax, tightened the wire to go straight, changed the direction of the radiator about 90 degrees my SWR looks like this:
So i don’t know what really happened? Maybe it’s the direction of the radiator, maybe the way the coax is laid out, maybe the fact that the antenna is a few meters higher from the ground but SWR has gone up and most importantly, my dips have gone. It’s not a really big issue because my ATU can match it anyway, but match or no match, a bad antenna is a bad antenna.
I haven’t grounded the antenna yet. I will try this today and see if that helps getting the SWR down. Ground is far away, so i have to figure out how to do this.
I just got this to help me with the project. Awaiting delivery…