OK to use TV coax for microphone?

Re: OK to use TV coax for microphone?

On Thu, 8 May 2008 01:40:30 +1000, "Phil Allison"
<philallison@tpg,com .au> wrote:

>
>" John Fields = Criminal Psychopath "
>
>
>>>> It's not like you're stupid, you know,
>>>
>>>
>>>** Such flattery will get you no-where.
>>
>> Not at all flattery,
>
>
>** You missed the obvious irony - fuckwit
>
> ( snip gratuitous abuse)
>
>
>>>** Have you stopped beating your wife?
>>
>> Hardly a parallel ...
>
>
>** You missed the obvious allusion to the unproven assertion
>
>- you asinine, criminal fuckwit.
>
>
>
>> have you seen the complete trash "Arny " put in his reply to my points ?
>>>
>>>Why don't YOU inform the several NGs how wrong it is ?
>>
>> ---
>> Because, if _you_ think it's wrong,
>
>
>** So you think it is all just fine - eh ??
>
>That is not what you just posted - then snipped.
>
>Typical.
>
>
>
>>>Your silence = approval.
>>
>> Wrong again.
>
>
>** Silence in the face of wrong doing = tacit approval.
>
>Basic fact about human behaviour.
>
>Forever obscure to criminal psychopaths like you.
>
>
>BTW:
>
>I am clearly wasting precious time dealing with idiotic, HOSTILE questions
>one of the VERY worst, criminal, autistic psychopaths on all of usenet.
>
>You are piece of vile, sub human scum - Mr Fields.
>
>I hope you die very soon in the most agonising way imaginable.
>
>Same goes for all your genetic relatives - young and old.
>
>BTW 2:
>
>
>If ever come to visit Austin Texas - be most assured
>
>I will buy a cheap hand gun, track YOU down like a dog a shoot you full
>of holes.

---
Hmmm...

http :// web.acma.gov.au/AimsWeb/newscontent.jsp

What do you think?

Should I fill it out and send it off to them?

JF

Re: OK to use TV coax for microphone?


John Fields wrote:
>
> On Thu, 8 May 2008 01:40:30 +1000, "Phil Allison"
> <philallison@tpg,com .au> wrote:
>
> >
> >" John Fields = Criminal Psychopath "
> >
> >
> >>>> It's not like you're stupid, you know,
> >>>
> >>>
> >>>** Such flattery will get you no-where.
> >>
> >> Not at all flattery,
> >
> >
> >** You missed the obvious irony - fuckwit
> >
> > ( snip gratuitous abuse)
> >
> >
> >>>** Have you stopped beating your wife?
> >>
> >> Hardly a parallel ...
> >
> >
> >** You missed the obvious allusion to the unproven assertion
> >
> >- you asinine, criminal fuckwit.
> >
> >
> >
> >> have you seen the complete trash "Arny " put in his reply to my points ?
> >>>
> >>>Why don't YOU inform the several NGs how wrong it is ?
> >>
> >> ---
> >> Because, if _you_ think it's wrong,
> >
> >
> >** So you think it is all just fine - eh ??
> >
> >That is not what you just posted - then snipped.
> >
> >Typical.
> >
> >
> >
> >>>Your silence = approval.
> >>
> >> Wrong again.
> >
> >
> >** Silence in the face of wrong doing = tacit approval.
> >
> >Basic fact about human behaviour.
> >
> >Forever obscure to criminal psychopaths like you.
> >
> >
> >BTW:
> >
> >I am clearly wasting precious time dealing with idiotic, HOSTILE questions
> >one of the VERY worst, criminal, autistic psychopaths on all of usenet.
> >
> >You are piece of vile, sub human scum - Mr Fields.
> >
> >I hope you die very soon in the most agonising way imaginable.
> >
> >Same goes for all your genetic relatives - young and old.
> >
> >BTW 2:
> >
> >
> >If ever come to visit Austin Texas - be most assured
> >
> >I will buy a cheap hand gun, track YOU down like a dog a shoot you full
> >of holes.
>
> ---
> Hmmm...
>
> http :// web.acma.gov.au/AimsWeb/newscontent.jsp
>
> What do you think?
>
> Should I fill it out and send it off to them?


Go for it. Maybe they will kick the door down in the middle of the
night and waterboard him.


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Re: OK to use TV coax for microphone?

John Fields wrote:
> On Thu, 8 May 2008 01:40:30 +1000, "Phil Allison"
> <philallison@tpg,com .au> wrote:
>
>
>>" John Fields = Criminal Psychopath "
>>
>>
>>
>>>>>It's not like you're stupid, you know,
>>>>
>>>>
>>>>** Such flattery will get you no-where.
>>>
>>>Not at all flattery,
>>
>>
>>** You missed the obvious irony - fuckwit
>>
>> ( snip gratuitous abuse)
>>
>>
>>
>>>>** Have you stopped beating your wife?
>>>
>>>Hardly a parallel ...
>>
>>
>>** You missed the obvious allusion to the unproven assertion
>>
>>- you asinine, criminal fuckwit.
>>
>>
>>
>>
>>>have you seen the complete trash "Arny " put in his reply to my points ?
>>>
>>>>Why don't YOU inform the several NGs how wrong it is ?
>>>
>>>---
>>>Because, if you think it's wrong,
>>
>>
>>** So you think it is all just fine - eh ??
>>
>>That is not what you just posted - then snipped.
>>
>>Typical.
>>
>>
>>
>>
>>>>Your silence = approval.
>>>
>>>Wrong again.
>>
>>
>>** Silence in the face of wrong doing = tacit approval.
>>
>>Basic fact about human behaviour.
>>
>>Forever obscure to criminal psychopaths like you.
>>
>>
>>BTW:
>>
>>I am clearly wasting precious time dealing with idiotic, HOSTILE questions
>>one of the VERY worst, criminal, autistic psychopaths on all of usenet.
>>
>>You are piece of vile, sub human scum - Mr Fields.
>>
>>I hope you die very soon in the most agonising way imaginable.
>>
>>Same goes for all your genetic relatives - young and old.
>>
>>BTW 2:
>>
>>
>>If ever come to visit Austin Texas - be most assured
>>
>>I will buy a cheap hand gun, track YOU down like a dog a shoot you full
>>of holes.
>
>
> ---
> Hmmm...
>
> http :// web.acma.gov.au/AimsWeb/newscontent.jsp
>
> What do you think?
>
> Should I fill it out and send it off to them?
>
> JF

Yes.

Ed

Re: OK to use TV coax for microphone?

On Wed, 07 May 2008 07:54:21 -0500, John Fields
<jfields@austininstruments,com > wrote:

>On Wed, 7 May 2008 11:26:08 +1000, "Phil Allison"
><philallison@tpg,com .au> wrote:

>>"John Fields"

>
>> > so why do you find it necessary to abuse your lessors?
>>
>>
>>** Have you stopped beating your wife?
>
>---
>Hardly a parallel since your propensity toward abuse is public
>knowledge and your claim that I have ever beaten my wife is imaginary.
>
>Interesting, though, that you equate 'lessor' with 'wife'...

Maybe his wife is also his landlady-- or did you mean "lessers"?

;-)

Best regards,
Spehro Pefhany
--
"it's the network..." "The Journey is the reward"
speff@interlog,com Info for manufacturers: http :// www .trexon,com
Embedded software/hardware/analog Info for designers: http :// www .speff,com

Re: OK to use TV coax for microphone?

On Thu, 08 May 2008 14:11:27 -0400, Spehro Pefhany
<speffSNIP@interlogDOTyou.knowwhat> wrote:

>On Wed, 07 May 2008 07:54:21 -0500, John Fields
><jfields@austininstruments,com > wrote:
>
>>On Wed, 7 May 2008 11:26:08 +1000, "Phil Allison"
>><philallison@tpg,com .au> wrote:
>
>>>"John Fields"
>
>>
>>> > so why do you find it necessary to abuse your lessors?
>>>
>>>
>>>** Have you stopped beating your wife?
>>
>>---
>>Hardly a parallel since your propensity toward abuse is public
>>knowledge and your claim that I have ever beaten my wife is imaginary.
>>
>>Interesting, though, that you equate 'lessor' with 'wife'...
>
>Maybe his wife is also his landlady-- or did you mean "lessers"?
>
>;-)

---
Yup. I thought it looked funny, I should have looked it up.

Thanks! :-)

JF

Re: OK to use TV coax for microphone?

On Tue, 06 May 2008 20:18:36 -0500, John Fields
<jfields@austininstruments,com > wrote:

>You're right, of course, since only the single center conductor of
>_coaxial_ cable can be congruent with the axis normal to the cross
>section of the shield.

Shielded twisted pair (with centered conductor pair, yada, yada)
is also coaxial in that the signal conductors average to a line.

The advantage of a pair over a single signal conductor is that
the receiving differential amplifier can discriminate against
common-mode noise.

The advantage of twisting a pair of signal conductors over an
untwisted pair is that non-planar noises are also averaged (more
or less) equally into both conductors. A receiving differential
amplifier is still required to discriminate against the noise.

All the best fortune,

Chris Hornbeck
"It's for compatibility with 8-Track."
-scott

Re: OK to use TV coax for microphone?

On Tue, 6 May 2008 08:00:44 -0400, "Arny Krueger" <arnyk@hotpop,com >
wrote:

>"Chris Siz" <default@default.invalid> wrote in message
>news:Xns9A936FA2EF13F451E7A@127.0.0.1
>
>> 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?
>
>What kind of microphone?
>
>> I don't want an impaired audio signal. The length I need
>> to use is 3 to 4 metres.
>
>Most good microphones need 2-conductor plus shield cable. Most coax has only
>one conductor, plus shield.
>
>> (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 two kinds of coax, 50 ohm and 72 ohm.

---
I believe coax for TV is universally 75 ohms, but there are certainly
more than two impedances available.

I see 32, 50, 51, 51.5, 52, 53.5, 73, 75, 80, 93, 95, and 125 ohm
cable at:

http :// www .belden,com /pdfs/Cable101/coaxrefc.pdf

JF

Re: OK to use TV coax for microphone?

In article <k4m0241f3gqv2760jegso8htpp5t457gab@4ax,com >, John Fields <jfields@austininstruments,com > wrote:
>On Tue, 6 May 2008 08:00:44 -0400, "Arny Krueger" <arnyk@hotpop,com >
>wrote:
>
>>"Chris Siz" <default@default.invalid> wrote in message
>>news:Xns9A936FA2EF13F451E7A@127.0.0.1
>>
>>> 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?
>>
>>What kind of microphone?
>>
>>> I don't want an impaired audio signal. The length I need
>>> to use is 3 to 4 metres.
>>
>>Most good microphones need 2-conductor plus shield cable. Most coax has only
>>one conductor, plus shield.
>>
>>> (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 two kinds of coax, 50 ohm and 72 ohm.
>
>---
>I believe coax for TV is universally 75 ohms, but there are certainly
>more than two impedances available.
>
>I see 32, 50, 51, 51.5, 52, 53.5, 73, 75, 80, 93, 95, and 125 ohm
>cable at:
>
> http :// www .belden,com /pdfs/Cable101/coaxrefc.pdf
>


On an old TV antenna I used 300 ohm Shielded Permaohm. Shielded twin lead. I don't see it
being made now.

greg

Re: OK to use TV coax for microphone?

On Tue, 06 May 2008 13:35:40 GMT, zekfrivo@zekfrivolous,com (GregS)
wrote:

>In article <k4m0241f3gqv2760jegso8htpp5t457gab@4ax,com >, John Fields <jfields@austininstruments,com > wrote:

>>I see 32, 50, 51, 51.5, 52, 53.5, 73, 75, 80, 93, 95, and 125 ohm
>>cable at:
>>
>> http :// www .belden,com /pdfs/Cable101/coaxrefc.pdf
>>
>
>
>On an old TV antenna I used 300 ohm Shielded Permaohm. Shielded twin lead. I don't see it
>being made now.

---
I vaguely remember seeing something like that. I don't know how far
back, but I never used it.

The last time I did TV stuff of any consequence I'd just gotten
married and we were living in an apartment in New York, in the Bronx,
and our TV reception was a mess (rabbit ears on top of the TV) of
ghosts because of multipath reflections from the buildings around us.

I'd just read about log periodic antennas and how nicely broadband and
directional they were, so I decided to build one for the TV band from
the instructions in Popular Electronics (or one of the other hobby
mags), and after scaring the shit out of my wife with this not
inconsiderable structure growing and coming to life in our living
room, eventually got it installed on the roof of our building with the
blessings of our landlord.

Varnished wood and wire and, as I recall, 300 ohm twinlead leading
down to our TV.

Then I had to build an intercom so that as I adjusted the antenna in
azimuth and elevation, my wife would say "better" or "worse" as I
pointed the antenna. Eventually we zeroed in on the best picture we
could get and got rid of most of the ghosts.

Thanks for bringing back those memories. :-)

JF

Re: OK to use TV coax for microphone?


Arny Krueger wrote:
>
> "Chris Siz" <default@default.invalid> wrote in message
> news:Xns9A936FA2EF13F451E7A@127.0.0.1
>
> > 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?
>
> What kind of microphone?
>
> > I don't want an impaired audio signal. The length I need
> > to use is 3 to 4 metres.
>
> Most good microphones need 2-conductor plus shield cable. Most coax has only
> one conductor, plus shield.


Twinax has two conductors + shield. IBM used it on mainframes,
decades ago.


> > (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 two kinds of coax, 50 ohm and 72 ohm. What is the impedance of the
> coax, and what is the required impedance for your application? In short
> lengths it won't matter, but for like 30' or more, it might.


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Re: OK to use TV coax for microphone?

In article <aLudnTpXFc9XGb3VnZ2dnUVZ qTinZ2d@earthlink,com >,
mike.terrell@earthlink,net says...
>
> Arny Krueger wrote:
> >
> > "Chris Siz" <default@default.invalid> wrote in message
> > news:Xns9A936FA2EF13F451E7A@127.0.0.1
> >
> > > 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?
> >
> > What kind of microphone?
> >
> > > I don't want an impaired audio signal. The length I need
> > > to use is 3 to 4 metres.
> >
> > Most good microphones need 2-conductor plus shield cable. Most coax has only
> > one conductor, plus shield.
>
>
> Twinax has two conductors + shield. IBM used it on mainframes,
> decades ago.

Never saw any twinax in the mainframes. The standard was "trilead"
(signal with two grounds connected to a "tuning fork" connector that
slipped over the signal pin and ground rail) and later high-speed
trilead (Gore-Tex insulation) and sometimes micro-dot coax for
clocks. They used both 50ohm and 90ohm varieties. ...and piles of
it!


--
Keith

Re: OK to use TV coax for microphone?


krw wrote:
>
> In article <aLudnTpXFc9XGb3VnZ2dnUVZ_qTinZ2d@earthlink,com >,
> mike.terrell@earthlink,net says...
> >
> > Arny Krueger wrote:
> > >
> > > "Chris Siz" <default@default.invalid> wrote in message
> > > news:Xns9A936FA2EF13F451E7A@127.0.0.1
> > >
> > > > 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?
> > >
> > > What kind of microphone?
> > >
> > > > I don't want an impaired audio signal. The length I need
> > > > to use is 3 to 4 metres.
> > >
> > > Most good microphones need 2-conductor plus shield cable. Most coax has only
> > > one conductor, plus shield.
> >
> >
> > Twinax has two conductors + shield. IBM used it on mainframes,
> > decades ago.
>
> Never saw any twinax in the mainframes. The standard was "trilead"
> (signal with two grounds connected to a "tuning fork" connector that
> slipped over the signal pin and ground rail) and later high-speed
> trilead (Gore-Tex insulation) and sometimes micro-dot coax for
> clocks. They used both 50ohm and 90ohm varieties. ...and piles of
> it!
>
> --
> Keith


< http :// www ,net working.ibm,com /nhd/webnav.nsf/pages/729:7299book:7299book.html>


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Re: OK to use TV coax for microphone?

In article <3e6dnc8m7NQ0Y73VnZ2dnUVZ jGdnZ2d@earthlink,com >,
mike.terrell@earthlink,net says...
>
> krw wrote:
> >
> > In article <aLudnTpXFc9XGb3VnZ2dnUVZ qTinZ2d@earthlink,com >,
> > mike.terrell@earthlink,net says...
> > >
> > > Arny Krueger wrote:
> > > >
> > > > "Chris Siz" <default@default.invalid> wrote in message
> > > > news:Xns9A936FA2EF13F451E7A@127.0.0.1
> > > >
> > > > > 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?
> > > >
> > > > What kind of microphone?
> > > >
> > > > > I don't want an impaired audio signal. The length I need
> > > > > to use is 3 to 4 metres.
> > > >
> > > > Most good microphones need 2-conductor plus shield cable. Most coax has only
> > > > one conductor, plus shield.
> > >
> > >
> > > Twinax has two conductors + shield. IBM used it on mainframes,
> > > decades ago.
> >
> > Never saw any twinax in the mainframes. The standard was "trilead"
> > (signal with two grounds connected to a "tuning fork" connector that
> > slipped over the signal pin and ground rail) and later high-speed
> > trilead (Gore-Tex insulation) and sometimes micro-dot coax for
> > clocks. They used both 50ohm and 90ohm varieties. ...and piles of
> > it!
> >
> > --
> > Keith
>
>
> < http :// www ,net working.ibm,com /nhd/webnav.nsf/pages/729:7299book:7299book.html>
>

AS400 ain't a mainframe. ;-) It's made by those wheat farmers on
the tundra; never seen one.

--
Keith

Re: OK to use TV coax for microphone?


krw wrote:
>
> AS400 ain't a mainframe. ;-) It's made by those wheat farmers on
> the tundra; never seen one.


I scrapped a trailer load of data concentrators from the state of
Florida Dept. of Education, when they updated their system about 20
years ago, and some used twinax. They were connected to an old 370
system in Tallahassee. I got the crappy tape drives, as well. I still
have a new twinax connector, somewhere in the shop, along with some 'HN'
connectors.


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Re: OK to use TV coax for microphone?

"krw" <krw@att.bizzzzzzzzzz> wrote in message
news:MPG.228acbd8cf8af11b989be3@news.individual,net ...
> AS400 ain't a mainframe. ;-) It's made by those wheat farmers on
> the tundra; never seen one.

I've seen several... inside of IBM buildings. :-)

It's actually a pretty neat machine in many ways with one of the most "modern"
operating systems available: Linux and the Mac OS trace their roots to UNIX,
and Windows comes from Dave Cutler who also did VMS -- both back in the '70s,
whereas OS/400 was written from scratch in the late '80s and benefitted from
everything that had been learned in UNIX and VMS. Of course, UNIX and VMS
have evolved as well, but there are certain fundamental aspects that will
always remain, such as the UNIX "everything is a file" design decision.

---Joel