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Guest
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 Posted:
Tue Oct 25, 2005 4:42 am Post subject:
Re: Convert rca to coaxial - audio only |
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<michaeljc70@hotmail.com> wrote in message
news:1129943076.312907.248870@g14g2000cwa.googlegroups.com...
| Quote: | I have seen many posts on converting video/audio from RCa to coax. I
want to use existing coaxial in my house to carry an audio only signal.
This will be going from my PC's sound card RCA jacks to coaxial in the
wall to RCA jacks on my receiver.
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RCA is the term usually applied to the plug and jack combination that is
usually found in the back of a receiver or amplifier. I was invented by RCA
back in the mid 30's. The first one I saw was on an RCA radio-phonograph
that the family bought in 1937. "Coax" on the other hand, is a word used
to describe a cable in which the signal travels down the middle of the cable
and returns by the outer shield. It has nothing to do with RCA connectors,
which may or may not be used to connect coaxial cable.
I have seen RCA connectors on the end of fairly hefty coaxial cables, but it
isn't common. Such cables generally use either BNC or F connectors--usually
the latter. Since you happen to have heavy coaxial cable running through
your house, you can buy an adapter that converts the F connector to an RCA
connector. Better yet, you can buy cables that have F on one end and RCA
on the other.
Norm Strong
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Tomi Holger Engdahl
Guest
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| Posted:
Tue Oct 25, 2005 5:30 pm Post subject:
Re: Convert rca to coaxial - audio only |
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"Geoff Wood" <geoff@nospam-paf.co.nz> writes:
| Quote: | "Richard Crowley" <rcrowley@xpr7t.net> wrote in message
news:11loe9sctv7pl01@corp.supernews.com...
Disagree. In my experience, 100s (or even 1000s) of feet are not
impractical in many cases. The main hazard is the
possibility of ground loops between the equipment at each
end. Cable made for TV is good for 100s of MHz. 20KHz
of audio is of no concern whatsoever.
In/out impedences of most consumer audio gear is totally unsuited for going
more that a meter of two at the most without hf drop-off.
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The output impedances from consumer gear can vary widely.
The impedances can easily vary from around 30 ohms
(some sound cards) to five kilo-ohms (some CD players etc..)
The impedance is typically in few hundred ohms to two kilo-ohms.
This is a greate difference on the effect of cable.
The device with several kilo-ohms output impedance
is unsuited for going more than few meters without noticeable
high frequency roll-off.
The device which has output impedance of jsut tens of ohms
vile nicely run tens of meters with same or less high frequency
loss than this kilo-ohms output impedance equipment gets on
few meters of cable.
| Quote: | Disagree. They are, in essence, identical. "TV coax" (i.e.
cable made for RF frequencies) is merely designed for
lower loss at high frequencies, which is actually better
for audio frequencies.
You have never seen the "screen" of an RF TV cable ? Coax cables work on a
totally different concept to screened audio cable.
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I have seen the "screen" of an RF TV cable. I have seen the
construction of quite many coaxial cables.
For audio application in coaxial cable there is a centre core
and there's a screen, just like in the simple screened audio cable.
A top quality RG6 coax comes with the following features:
solid copper center conductor, foam PE dielectric,
| Quote: | 93% braided copper shield plus 100% foil shield.
This coax fits for all audio-video cables, form cable TV |
to audio interconnections.
There are even plans how you can build your own audio/video
cables from coaxial cables and RCA cables.
http://www.bus.ucf.edu/cwhite/theater/diycable.htm
http://www.bdcable.com/subwoofer-cable-kit.htm
--
Tomi Engdahl (http://www.iki.fi/then/)
Take a look at my electronics web links and documents at
http://www.epanorama.net/ |
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AZ Nomad
Guest
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| Posted:
Tue Oct 25, 2005 6:46 pm Post subject:
Re: Convert rca to coaxial - audio only |
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On 25 Oct 2005 15:30:55 +0300, Tomi Holger Engdahl <then@solarflare.cs.hut.fi> wrote:
| Quote: | There are even plans how you can build your own audio/video
cables from coaxial cables and RCA cables.
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Sounds like a recipe for making ice cubes. |
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