Archive for the ‘Antennas’ Category

Restoring the Kenpro KR-5400 Rotator

As mentioned in my prior post, I found that the elevation rotator for my Kenpro-5400 set had corroded internally to the point where it was no longer working.  It had been sitting outside in the weather for over 10 years, with no maintenance or activity, and the seals had allowed water to leak into the […]

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Trap Dipole for the Mesa QTH

In preparation for the Novice Rig Roundup, I was reminded of my poor state of affairs for low band operation at my Mesa QTH.  I had put up a quick 40-meter dipole about 5 or 6 years ago, but it was only about 15 feet off the ground.  This did not do a very good […]

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43′ Vertical Final Tuning

After acquiring an Antenna Analyzer (MFJ-269B), I set the matching network on the bench and began playing with it.  I had a theory that I could simulate the antenna load at various frequencies by placing a capacitor in series with a resistor of various values for the different frequencies.  Then by attaching that to the […]

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Tilt-Over Support for 43′ Vertical

I took the two grandsons up to the Ranch in mid-June to help with construction of the 43′ vertical tilt-over support. The idea is to be able to easily tilt the vertical down to a “stowed” position before I leave for an extended period of time. It shouldn’t hurt to have that capability in case […]

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T-Bias interface

I had a comment a few weeks ago asking for more details about the T-Bias device used to send DC over the active RF coax to my 43′ vertical antenna. This is used to switch the matching network such that: 0 volts = 60 – 6 meter operation +12 volts = 80 meter operation -12 […]

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