CQ DE VK7BEN

Just another Amateur Radio Operator

Tag: Troubleshooting

More Experiments with EFHW Antennas – Part 2

EFHW Match Unit

It’s been a couple of years now since my first post on EFHW Antennas. Notably since then I have acquired a Mini 600 Analyser. Armed with technology it was time to revisit this “no-tune” portable antenna. What followed was 3 months of confusion, learning and experimentation.

Before I go any further I would sincerely like to thank David VK3IL for his patience and assistance over the last 2 weeks in helping me troubleshoot my issues and teach me a bit more about what I was doing along the way.

It all started when I thought it would be a good idea to re-test the end-fed antenna now I have a new analyser as I was preparing ready-to-assemble kits for my local radio club and didn’t want to see people ending up with an antenna that didn’t work as described. To my dismay, the antenna definitely was not working as originally described.

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Attack of the RFI

After having a successful setup of the radio shack over the weekend, I took the HF rig to the local radio club, but when I returned, and plugged everything back in, BUZZZZZZZZZ. S20 over 9 noise. not good.

Troubleshooting kicked in. Whats changed? Earlier in the afternoon I had put up the 6m dipole antenna and finished working on installing an earthing stake and earth wires back to the rig. By process of elimination, I removed each. Noise still there.
It was late in the night by this point so I made an assumption that the noise was in fact being caused by nearby power lines having damp insulators, so went to bed with the though of investigating the issue if it existed the following day. Yes, it did exist the following day.

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