Updated 8/29/2007









HL9AVT Amateur Radio Operations in South Korea.

Korean War Museum - Located in Seoul, the Capital of South Korea, a must see.

Korean Links - In English.

My Apartment HF Antenna

Living in an apartment I did not have room for a big antenna, but I was up 10 stories so that helped some. My first antenna was basically a random wire antenna with a MFJ tuner installed right at the feed point. Grounding consisted of using the metal rail and a counterpoise wire.

With winter coming I found it too much of a hassle to go out in the cold and tune the antenna so I replaced the MFJ tuner with a SGC-237 tuner mounted in a kitchen food storage box. The SGC auto tuner works great, and tunes fast!

MFJ tuner and random wire antenna about 35 ft long.
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Station upgrade, SGC 237 autotuner ( shown mounted in plastic box, back view) with antenna wire coiled up.

The wooden pole is a toilet plunger that fits into the flag pole holder on the hand rail. A coat hanger is used to get the wire away from the building.
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Shown below is the hand rail and flag pole holder (antenna mount) and grounding for SGC tuner. I also ran to 25 ft radials off the railing. The ground strap cost less than a dollar at a local Korean amateur swap meet.

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Grounding attached to SGC 237 tuner. Not shown ,I also ran a total of four 25 foot radials from the same ground lug along two the wall boards (two along each wall). With the Radials I found you don't need the ground strap on the rail at all and the VSWR is actually better (lower).

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This is the final installation. weather proof and ready to operate. This is nice, no more going outside to tune the antenna in the cold.

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When not in use, I would bring the whole unit inside the apartment.

Below is a picture of the quick disconnects used. One is for the RG58, providing RF to the SGC antenna tuner the other is providing a few milliamps at 12.8VDC to the SGC tuner. The split bead torrid is used to help keep any RF off the power line.

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Hope this helps others in similar situations see how to implement the SGC 237 tuner.

















Copyright © 2003-2009 J. Lauben. All rights reserved.