With an armful of redundant wire from a previous job (Most of it either 12 or 16AWG) I set about creating a 5/8 50Mhz vertical antenna. The idea was to make a wire version of the G3JVL antenna as featured on the UKSMG website. All the parts came out of the scrap bins at work one lunchtime with the exception of the bolts. Only the hole saw and drill had to be borrowed.
The instructions are fairly self explanatory and it shouldn’t be hard to follow, or so I thought. As with most of the designs on the internet I found that there wasn’t much to back up the picture should anything not give the results you were looking for. Would you believe it but mine just doesn’t want to be resonant at 50Mhz, 40 yes or maybe 41Mhz but 50Mhz? Not today, or tomorrow for that matter. So its to the scrap bin again to find out the problem. I suspect its down to the coil.
I knocked together a wound coil which I can tap at any of the whole coils, wound round a piece of ~20mm OD PVC pipe. I will use this to see if I can get the beasty to be resonant on 50Mhz or thereabouts by changing the tapping point. If it all went to plan then it wouldn’t be any fun right?