Re: OK to use TV coax for microphone?

Kevin McMurtrie wrote:
> In article <Xns9A936FA2EF13F451E7A@[EMAIL PROTECTED]
>,
>  Chris Siz <default@[EMAIL PROTECTED]
> 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 ****eld is aluminum wire and aluminum foil.  It will quickly crack 
> where it meets the connectors.
Not necessarily in fact a lot of TV coax is entirely copper.
> 
> TV coax may not pass small audio signals well because of its aluminum 
> ****eld.  Aluminum is extremely reactive so it is always coated with a 
> thin oxide layer.

Yes, the laws of nature decided that.
   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 ****elding.

Rubbish.
> 
> 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.

Rubbish again. Where do you get this knowledge from?

Steve

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