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LPDA with a reflector?

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Jason Lavoie:
Never mind the fact that the antenna is almost touching the truss and is certainly not performing as well as it should be
But is this amateur-hour or a useful trick to put an LPDA on a dish/reflector?

Jason

Lyle Williams:
Amateur hour.  The active area of the ldpa can't be at the dish focal point for anything but a very small range of frequencies.  With found parts, that is unlikely to be at the frequency you want.  Better to stick with the ldpa if you want moderate gain and wideband response, or cut your own dipole for the dish if you need high gain at a fixed frequency.

Scott Helmke:
Are you sure that it's a LDPA at UHF frequencies? Could be something else entirely.

Jason Lavoie:

--- Quote from: Scott Helmke on November 03, 2015, 09:57:13 am ---Are you sure that it's a LDPA at UHF frequencies? Could be something else entirely.

--- End quote ---

It is in a large store, and is aimed towards an adjacent building which is their head office, so a data link makes sense.

And after thinking about it I agree with Lyle. Frequencies aside, the dish is only useful at its focal point

maybe it is a plastic cover for an LDPA over top of something else?

Jason

Lyle Williams:
... or the thing shaped like a ldpa is just a support for the driven element.  That would provide room for inbuilt electronics.

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