On 08/04/2010 09:20 PM, John Wighton wrote:
> Thanks chaps, Garmin make a big thing about the advanced design of
> the SL30. Hopefully that is one of the reasons why most users seem
> to be able to use a single antenna.
No, it is not. The receiver has nothing to do with it. If you want to
receive two frequencies spaced that far apart, you need two antenna's,
or suffer huge losses due to cable mismatches.
> I have ordered the Bob Archer antenna and plane to fit it on the fuse
> floor.
I suspect that the Bob Archer antenna is specifically designed for
reception of VHF signals (VOR & LOC), and performs poor (if at all)
around 330 MHz (The frequency of the glide scope) It may well simply act
as a short cut for these frequencies.
If you want to go this route, ask the manufacturer how the antenna
performs for 330 MHz signals. It might well be that he objects about
using the antenna for this purpose.
Good luck and let us know how it works out.
Frans
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