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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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Posted on Jan 02, 2017

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if its the outer ring then yes you can fix it, you just need to solder it back on. if the inner part has come out it will be the same re solder it back in but you need to be more careful as it has other parts connected to it that are heat sensitive, outer part to repair good make a copper ring the size of the fitment and solder this to the board part, then solder the aerial part to the inner part of the copper ring this is stronger than just soldering the hole peace back on

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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.

To some extent you can perform the tests at the aerial base but the results will be limited due to the physical connection between the cable and aerial base won't be part of the test.

You need to be aware some installations are fitted with an aerial amplifier which can confuse matters and make checking more difficult.

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Can only be the coax input to the radio. Often the fault is that the soldered end is faulty at either the radio or the aerial end. If you have a voltmeter, check for shorts by putting each cable to the inner and outer coax wires. They should not be touching. If they are and the two ends are clear of each other it is likely a cracked cable inside. The easiest fix is to just use 12V wire or coax - as long as the two coax plugs are connected to the inner and outer, you will get a connection the the aerial. If you are getting ZERO reception then it is likely the cable is shot. Even if the aerial isnt connected, the cable itself should act as an antenna.

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With all antennas you MUST ensure that it is all OK, physically check, there are no whiskers of braid caught between Inner & Shield, Make sure the center pin IS contacting in the socket. Check The connections at the Antenna end. Check the earth braid. If you can check continuity with a meter, check for "Shorts" between braid & center conductor. make sure it is Pointed at the Transponder... even a little off will give signal loss. rain fade is a huge problem unfortunately.

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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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Hi.

There wil be 2 inner cores and a screen which is an outer core that wraps around the 2 inner cores. The 2 inner cores should be different colours. All you need to do is strip the wires back and connect each of the cores together, for example a red and white core would connect red to red white to white.

The best way to do this is to use a soldering iron then tape around the individual cores ensuring that they don't touch.

For reference. 1 inner core is for the left ear, the other for the right, and the outer core is the common return.

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You will need a low loss co-axial av cable from the dish lnb tp the receiver (normal centre core and braided outer) . The electrical supply is normally by plug-in to a domestic outlet, 13 amps 240v in the UK

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1 Answer

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If you put aerial up your self was it wide band aerial ?
Is it in the atic or on the roof ?
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How long is cable run from aerial ?
Have you checked that when you fitted rf plugs that none of the braid strands are touching solid copper inner core ?
Ask an earial installer or Tv shop what the signal strength is like in your area.
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