How to make own VOR/ILS/GS antenna

Discussion in 'Instruments / Avionics / Electrical System' started by PrzemekMac, Aug 5, 2014.

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  1. Aug 5, 2014 #1

    PrzemekMac

    PrzemekMac

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    HI. I have garmin SL-32 and I'd like to enable nav part of this radio. I thinking about make home-build VOR/LOC/GS antenna. Maybe someone have any diagrams of this?
     
  2. Aug 5, 2014 #2

    BJC

    BJC

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  3. Aug 5, 2014 #3

    djschwartz

    djschwartz

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    The VOR/LOC easily use the same antenna as they are both in the same frequency band, 108 to 118 MHz. The GS is at 329 to 335 MHz. There are a variety of ways to make a multi-band antenna and since the GS is generally used at fairly short range you can often get away with out actually designing such an antenna. The American Radio Relay League (ARRL), the organization for ham radio operators, has books on antenna design. None will give a specific design for aviation but the design methods can all be scaled for the desired frequency of operation.

    That said, if you intend to do real ILS approaches to minimums in real IFR weather when your life depends on it, I'd recommend making the investment in either buying known good antennas or really learning about how such designs are done and tested for performance. That investment would include getting your hands on some reliable antenna test equipment.

    Dave
     
  4. Aug 5, 2014 #4

    fredoyster

    fredoyster

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    It's not difficult but designs depend on what kind of airplane it is. The RST Engineering link is good for composite aircraft. A regular vee dipole with a coax balun is good for VOR/LOC and works well enough with a splitter to feed the GS too.

    Tell us what kind of aircraft and you might get some suggestions about what works.
     
  5. Aug 7, 2014 #5

    PrzemekMac

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  6. Aug 7, 2014 #6

    djschwartz

    djschwartz

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    In that case a very simple dipole cut to the proper length for the middle of the VOR/LOC band should be sufficient. You can make the dipole elements from copper tape, copper mesh, copper wire, or aluminum tubing, whichever is easiest to fabricate and install in your aircraft. A ferrite or coax balun will help with performance but is not absolutely necessary.

    Dave
     
  7. Aug 7, 2014 #7

    kent Ashton

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