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I have a short between the inner copper core and the outer braid on the lead from the aerial amplifier is this a normal condition prior to supplying the amp with a voltage

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There should be no short between the conductor (core) and the shield (braid), especially if it is used to supply voltage. Please be careful.

Posted on Oct 09, 2008


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VW Polo 1.0 1999, Aerial not working

It is usually best to check an aerial from the radio end with an ohmmeter or continuity checker. The aerial cable is a coaxial cable with a centre core that carries the signal and an outer braid that when properly grounded keeps interference to a minimum.

Measuring between the centre and the outer there should be an infinity reading on an ohmmeter, indicating no short circuits in the cable or aerial base. Measuring between the outer and a good ground the reading should be very low, no more than a few ohms indicating a good ground connection to the aerial base and of the aerial base to the bodywork.
The next test is simple and tricky at the same time as one lead of the meter will need extending. Remove the aerial mast and test for a very low reading of just 2 or 3 ohms between the cable centre and the stud or socket where the mast mounts. If all tests are fine it indicates the mast has an internal fault. If the tests aren't fine the cause is fairly intuitive.

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Got a new tv antenna installed the other day, rescanned the channels and can't get Channel 10 in Sydney, Ingleburn (yes, we do have television in Ingleburn)! Also, it rained on the weekend and ABC dropped...

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Is ordinary coaxial cable suitable for a flat

Yes, normal co-axial cable is fine. Check the end piece of the aerial connector that goes into the TV, check there is no break in the cable or that the position of your aerial has moved off alignment. If you have wired the aerial connector yourself, ensure the outer earthing braid does not come into contact with the inner wire.

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If you put aerial up your self was it wide band aerial ?
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