Re: OK to use TV coax for microphone?

"Richard Crowley"
>
>> (1) Is it ok to use this sort of coax for a microphone?
>
> Not enough details to answer your question adequately.
> First of all, the kinds of microphones used for audio
> applications (reinforcement, recording, etc.) are usually
> balanced and require cable with two inner wires and an
> outside ****eld/screen.  If you are trying to use a balanced
> mic, then the cable is unsuitable because it is unbalanced.


** Not true at all !!

There is  NO reason not to use a (suitable) co-axial type cable with a 
microphone  -  either low or high impedance.

Despite all the nonsense you WILL  have read elsewhere,  co-axial cables 
have as good or better rejection of external hum and noise sources as do 
balanced twin wire cables.

Try it out if you don't believe this.



>> The length I need to use is 3 to 4 metres.
>
> Not really im****tant to the question.  It wouldn't make
> much difference if it were 1 m or 1Km


**  If the mic is high impedance ( ie 50 kohms), then more than 10 metres
or 
so of cable will cause high frequency response peaking and early roll off
as 
the cable capacitance loads the transformer inside the mic.

If the mic is low impedance ( ie circa 250 ohms), then hundreds of metres 
can be used  -   but not kilometres.


.......  Phil