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TV antenna impedance measurements with MFJ-269.
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December 27th 04, 05:26 PM
Bill Turner
Posts: n/a
In article ,
says...
Looking at the impedances I got, nothing really looked good at the TV
frequencies as I would have expected.
If the match is this bad, I would expect alot of loss from the fact that I run
75 ohm cable down from this antenna to the TV set.
__________________________________________________ _________
The important thing with a TV antenna is broadband response across each
6 MHz channel. Signal loss can be made up with an amplifier mounted at
the antenna, but if there is severe impedance variation across a
channel, you will have a lot of ghosting in the picture. Some
frequencies will have a high SWR and others not, and that will cause
differing amounts of reflection across the band.
This same problem exists with TV transmitting antennas, and engineers go
to great lengths to make the response uniform.
--
Bill, W6WRT
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