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UHF Antennas.jpg


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Misc. Radio Gear

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Photo Information

  • Taken with Apple iPhone 3GS
  • Focal Length 3.9 mm
  • Exposure Time 1/15
  • f Aperture f/2.8
  • ISO Speed 100

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Antennas for UHF are fairly simple to build. You don't need much if the antenna will be used indoors.

The square loop is built for 432 MHz for the Ham 70cm band and sideband. It uses a simple hairpin type match. This was built, using some 12 Gage copper wire,  to test some simulation results. It came out reasonably close. The hairpin matching section is sort of touchy.

The antenna on the right was built using a cheap BNC panel connector and some buss wire. It's a 1/4 wave ground plane type with elements about 6 inches long. The simulation results showed it should have an SWR under 2:1 from 430 MHz to 470 MHz. The measured results where close making the antenna usable on the Ham 70cm band and also for GMRS. I built another one and use it in my office at work with a cheap CCR used as a scanner. The antenna is on top of a book case for better range.

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