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Joined: Fri, Nov 15th 2013, 19:29 Roles: N/A Moderates: N/A

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Topic Author Posted On
The "JUNKER" AMP n8chr8 on 14/8/20
When I saw the article in the Aug. QST I thought it might be fun to put one together. I have an 813 tube NOS in the box and most of the other parts. Old microwave ovens are a good source for HV transformers and diodes, they run around 2KV on the secondary, maybe too high for the 811's but probably close for 813 without the need for the doubler.
73 Tom N2DMK
2 Meter Slot-Cube Antenna (QST Jan 2019) K1AWC on 11/3/19
I built the antenna over the past couple of weekends and found that mine also was resonant at 152 MHz. I lengthened two of the horizontal pipe sections 1 1/4" each and the resonant frequency dropped to 146 MHz. The SWR is below 1.3:1 across the band.
I also abandoned the CPVC coupling for two copper end caps, this gives a little more metal to tap into for the coax connection.

I would also like to try this antenna as a mobile as suggested by AD6ZH, and would like to know if anyone has tried it over a ground plane.

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