>On Sat 03 May 2008 19:05:41, Kevin McMurtrie wrote:
>

>> In article 127.0.0.1>,
>> Chris Siz wrote:
>>

>>> I am in the UK and have a 10m length of some cheap TV aerial
>>> coax. It came from a discount store as a TV coax extension
>>> cable. I measure the cable diameter as 4.8mm.
>>>
>>> (1) Is it ok to use this sort of coax for a microphone? I don't
>>> want an impaired audio signal. The length I need to use is 3 to
>>> 4 metres.
>>>
>>> (2) Is it ok for UHF TV or is it actually quite low grade coax
>>> and prone to interference or mess up the aerial signal?

>>
>> There are a few differences. TV coax will work in some conditions
>> but not generally.
>>
>> TV coax is very brittle. The inner wire is copper-plated steel
>> and the outer shield is aluminum wire and aluminum foil. It will
>> quickly crack where it meets the connectors.
>>
>> TV coax may not pass small audio signals well because of its
>> aluminum shield. Aluminum is extremely reactive so it is always
>> coated with a thin oxide layer. Higher voltages can spark through
>> it and TV RF can capacitively couple through it. Microphone
>> signals might become distorted. Cable for lower frequencies uses
>> copper shielding.
>>
>> Good microphone and instrument cable has an insulation that drains
>> away static electrical charges. RF coax can contain electrical
>> charges in the insulation that causes it to act like condenser
>> microphone.
>>

>
>I am the OP and as you can probably tell I am no electronics or
>radio expert. However even my limited knowledge struggles to
>believe some of the points you have made.
>
>Forgive me if it's more obvious to others but your's is not some
>sort of funny posting is it?