Finally the antenna is in its final location. Not the location i really wanted, but after going 3m down i decided to go the easy road. Well, the XYL insisted that i would NOT place the antenna in the location i initially wanted. But it’s up. A bit closed to the house, but it is what it is.
SWR without radials looks good, even though the dip frequency is a bit low, but the plan is to fix that using the radials. And that’s the mystery part of the project.
With no radials the SWR looks like this: A dip at 6.6, 14, 21-24 (nice!), 30 and somewhere at 54MHz. BTW, i wonder if 6m would really work considering the length of the antenna. If it does, nice, if not, i won’t use 6m anyway.
As mentioned, the plan was to adjust the final dip frequency using the radials. Everybody tells you to start with the lowest frequency first, so i hooked up my 40m radials first. I kept them at 10m80, appx. 20cm longer than the required 10m60 so i have room to adjust without making them too short in the first attempt.
What surprised me was that fixing the radials did absolutely nothing with the SWR. The dip was steady at 6.6MHz and didn’t move up if i shortened the radials. I shortened them at least 70cm and then i stopped.
What if the radials between themselves have effect?
So i hooked up the radials for 20m (5m40), 15m (3m60), 12m (3m) and 10m (2m70) as well to see if that made a difference. Nothing.
This is the wall below the parking. My 40m, 20m and 15m radials are spread out over that wall. The wall is appx. 5m high (from which i stumbled 3m down hurting my back and my knee).
The radials for 12 and 10m are spread out over the roof of the parking. Again, whatever i do with the radials, no changes in SWR. Any advice would be welcome.
I am now heating up my soldering iron to get the first connector on my new Airborne 5 cable and hook it up to the radio. Again, to be continued.
What i have done is create three plexiglass spreader at the base of the antenna, at 2m60 and 5m20 from the base. Through the spreaders i guided 0.5mm copper wire i bought at the DIY shop and fixed the two wires at the base of the antenna.
The big moment. SWR measurements. I hooked up the antenna analyser and got the following result:
What if i switch the connections? Let’s just try it.
Now that looks a lot better! We have a dip around 40m, 20m, 12m (no 15m?) and 10m, so that’s a good start. I wonder if i wired the choke the wrong way? But why didn’t i see that when i put up the antenna last week? Hmmm, questions, questions, questions.
Next step is putting the antenna in its final location and build out the radials set.
To be continued.