SALAD
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| posted on 13/5/13 at 08:59 PM |
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Car Aerial Impedance?
My brain is starting to hurt now so I'll ask on here.....Can you power a standard FM car aerial using something like this:
AIV CAR RADIO ANTENNA ADAPTER ISO TO AUDI/SEAT/VW 50 Ohm 10 cm BRAND NEW | eBay
Would such adapter reduce the FM aerial's impedance of 75ohm to 50ohm?
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HowardB
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| posted on 13/5/13 at 09:03 PM |
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not sure what the device does,. AIV?
but never the less for reception purposes impedance of 50 or 75 ohms is almost academic. Only for transmission need it be a significant issue unless
the signals are very marginal.
not sure that answers the question, but as I say for reception the impedance mismatch is not an issue.
hth
Howard
Fisher Fury was 2000 Zetec - now a 1600 (it Lives again and goes zoom)
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spiderman
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| posted on 14/5/13 at 01:23 AM |
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50 ohm for radio transmission/reception 75 ohm for video so should be okay. The adapter is for an antenna with a signal amp incorporated in it to
connect to a non manufacturers radio. First test would always be to make sure earths are all good, a majority of problems are earth related.
Hope that helps
Spider.
Spider
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ChrisW
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| posted on 14/5/13 at 02:32 PM |
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Also keep in mind that so-called 'amplifiers' for radio reception will not improve reception where poor signal is a problem. The
exception here is a distribution amplifier to enable multiple devices to use the same aerial.
The reason for this is that what we consider the 'signal level' is actually the difference of the signal level above the background noise
aka 'signal to noise ratio'. An amplifier cannot determine the difference between signal and noise, it amplifies everything, and as such
the ratio never changes and the perceived signal level never improves. In fact, the amplifier itself adds noise so in fact you will be worse off than
when you started.
Think of it like this: If a person talks at the same level as the noise coming from a radio you will struggle to hear them. If you double the volume
of each, the person is still masked by the noise of the radio.
The key to good radio (or TV, or anything) reception is to get the aerial right. No amount of compensation further down the line if the underlying
problem is a lack of received signal.
Chris
My gaff my rules
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SALAD
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| posted on 15/5/13 at 05:34 PM |
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Thanks for the replies guys.
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