Putting up a vertical antenna part 5 – More mysteries

20161015_160953Finally 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.


20161015_161024With 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.

20161015_16142920161015_164315What 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.

20161015_162819So now what do i do? The situation is as follows:

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.

Putting up a vertical antenna part 4 – Antenna built, first measurements

20161015_114313This is the antenne in its provisional location.






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:

20161015_114557WOW! Not so good. What could be wrong? I checked the connections, nothing wrong there. I checked the radiators, all good. No, i am not using radials yet, but could this make such a big difference?

What if i switch the connections? Let’s just try it.




20161015_114756Now 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.