Re: OK to use TV coax for microphone?

On Sun, 04 May 2008 17:16:19 GMT, nospam@[EMAIL PROTECTED]
 (Don Pearce)
wrote:

>On Sun, 4 May 2008 10:09:34 -0700, "Richard Crowley"
><rcrowley@[EMAIL PROTECTED]
> wrote:
>
>>"Don Pearce" wrote ...
>>>  "Richard Crowley"
>>> <rcrowley@[EMAIL PROTECTED]
> wrote:
>>>
>>>>RF coax made for cable TV use have foil ****elds plus
>>>>a few strands of wire braid around the foil.  In fact many
>>>>of them even have a double foil ****eld.
>>>>
>>>>Don't mistake the wire braid (which may, indeed be only
>>>>10% coverage) for the actual outer ****eld of the coax
>>>>which is the active ****tion.
>>>
>>> Yup, but the stuff we are discussing here has just a very loose braid.
>>> Have a look at the second pic on this page - low loss TV coax.
>>>
>>> http://www.megalithia.com/elect/cable/index.html
>>
>>What is that stuff good for?!
>>I've never seen anything like that over here.  It can't be
>>useful for low-level signals (receiving, audio, etc.) any
>>place where there is any RFI.
>>
>It is good for absolutely nothing, and nowadays resides only in cut
>price electrical stores and old boxes in attics.
>
>>OTOH, they make an intentionally "lossy" coaxial cable
>>(one brand name is "Radiax") which is used for distributed
>>Tx/Rx (such as running a cable through a tunnel to provide
>>cell service underground, etc.) That stuff has holes all along
>>the length to deliberately leak RF along the way. 
>>
>I know Andrew's Radiax very well - I've specified it for distributing
>VHF in tunnels.
>
>d

Now if there were more that only one minor competitor.