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I recently lucked into a bin-full of Kenwood TK-981 mobile radios at a
ham swap meet, and bought the lot. One seems to need a new final and pigtail. The other four had "Works" notations on their yellow stickies, and all transmit with a respectable amount of power. Pending further testing I think I've got some useful kit here. These are, of course, FM radios, mostly intended for repeater operation. They also have simplex "talk-around" capability. Whomever tested them, had cloned/programmed in a codeplug configuration which seems to cover most of the West Coast ham repeaters and a few simplex frequencies as well. The likely use for these would mostly be as part of an emergency- response kit, for helping set up command-net and message-net structures during an exercise, drill, or an actual event. Due to the scarcity of 33 cm radios I would not expect that many (if any) of the individual ARES/RACES operators in our area would be taking part. So... now I need to buy or make antennas for them. I'm interested in ideas and suggestions. I've seen a number of DIY designs on the net: - Simple ground-plane antennas using an N connector and a few wires soldered on are easy to make, and quite predictable. Unfortunately the wires sticking out in several directions makes them not all that "go-kit-friendly". I could figure out a design using (e.g.) banana plugs and jacks to connect the elements, so the antenna could be easily "unplugged and knocked down" for storage, but that seems like a lot of fiddling. - Several people have published designs for 33 cm J-poles, often with a collinear structure for higher gain. Fairly predictable but need some tuning during construction. Go-kit-friendly if installed in a fiberglass or PVC radome tube. - Simple sleeve dipoles (fold back the coax braid, trim for SWR, heat-shrink) are easy, cheap, go-kit-friendly, and should be fairly robust. Yagis would also be useful but aren't as go-kit-friendly due to their size; Kent Britain's "cheap Yagi" design is easy and the ones I've made for other bands have worked well. So, any other suggestions for simple-yet-effective DIY antennas for this band? Are there commercial antennas good and cheap enough that I should just buy a bunch? Good mobile antennas? |
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