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RE: Interference?
- Subject: RE: Interference?
- From: Mark Harrison
- Date: Mon, 25 Jun 2001 15:40:00 +0000
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<DIV><FONT face="Arial" color="#0000ff"
size="2"><SPAN
class="525123814-25062001">Nick,</SPAN></FONT></DIV>
<DIV><FONT face="Arial" color="#0000ff"
size="2"><SPAN
class="525123814-25062001"></SPAN></FONT> </DIV>
<DIV><FONT face="Arial" color="#0000ff"
size="2"><SPAN
class="525123814-25062001">Firstly - I have no connection with
Keith other than as a satisfied KAT5
customer!</SPAN></FONT></DIV>
<DIV><FONT face="Arial" color="#0000ff"
size="2"><SPAN
class="525123814-25062001"></SPAN></FONT> </DIV>
<DIV><FONT face="Arial" color="#0000ff"
size="2"><SPAN
class="525123814-25062001">Speaking as someone who was
formally a recording engineer, I fully support the use of Balanced Audio as
the ideal way to carry sound. When I was using seriously expensive
microphones, we always used balanced
cables.</SPAN></FONT></DIV><SPAN
class="525123814-25062001">
<DIV><BR><FONT face="Arial"
color="#0000ff" size="2">The difference between
this, and KAT5, is that CAT5 cabling is significantly cheaper than
XLR!</FONT></DIV>
<DIV><FONT face="Arial" color="#0000ff"
size="2"></FONT> </DIV>
<DIV></SPAN><SPAN
class="525123814-25062001"><FONT face="Arial"
color="#0000ff"
size="2">Regards,</FONT></SPAN></DIV>
<DIV><SPAN class="525123814-25062001"><FONT
face="Arial" color="#0000ff"
size="2"><BR>Mark
Harrison</FONT></SPAN></DIV>
<BLOCKQUOTE>
<DIV class="OutlookMessageHeader" dir="ltr"
align="left"><FONT face="Tahoma"
size="2">-----Original
Message-----<BR><B>From:</B> Keith Doxey [mailto:kat5users@xxxxxxx]<BR><B>Sent:</B>
25 June 2001 14:13<BR><B>To:</B>
kat5-users@xxxxxxx<BR><B>Subject:</B> RE: [KAT5]
Interference?<BR><BR></FONT></DIV><TT>Hi
Nick,<BR><BR>OK, so I will delay finishing your modules whilst
I answer your question :-)<BR><BR>No magic, just proven
technology as used in the Broadcast and Pro Audio<BR>industries since
the year dot. BALANCED LINE.<BR><BR>Some people seem paranoid
about interference from Mains. As long as you use<BR>balanced
distribution any interference is picked up equally on each
wire.<BR>This gets cancelled out when the signal is converted back to
unbalanced at<
;BR>the distant end.<BR><BR>Even mains wiring is mostly
balanced.....or should be. Whatever flows UP the<BR>live wire should
flow DOWN the neutral. EQUAL but OPPOSITE therefore<BR>effective
magnetic field generated is NULL.<BR><BR>The one real cause of
mainsborne interference would be the way lighting<BR>circuits were
wired in the Seventies. Due to a shortage of copper they<BR>abandoned
T&E and went for a Live+Earth and a Neutral
wire.<BR><BR>L&E went from consumer unit to switch to
switch to switch etc<BR>N went from consumer unit to rose to rose to
rose etc<BR>L&E from switch to rose.<BR><BR>Lots
of wires carrying current with no opposing current flowing to cancel
a<BR>magnetic field.<BR><BR>Hope to have news on the IR
add on very soon, just getting the initial rush<BR>of KAT5 second run
despatched then I will be able to experiemtn
more.<BR><BR>Keith<BR>&l
t;BR>> -----Original Message-----<BR>> From: nickt@xxxxxxx
[mailto:nickt@xxxxxxx]<BR>>
Sent: 25 June 2001 13:39<BR>> To: kat5-users@xxxxxxx<BR>>
Subject: Re: [KAT5] Interference?<BR>><BR>><BR>>
Keith,<BR>><BR>> I find that interesting - can you
describe what KAT5 does to the line<BR>> level signals to transmit
them in analogue form and yet not be<BR>> susceptible to mains hum
& noise, even with UTP CAT5e cable. I'd<BR>> assumed you
were transmitting digitally. Like Rehan, it's been<BR>>
impossible/impractical to avoid parallel runs with mains cables in
my<BR>> house and coupled with great expectations there will be a
degree of<BR>> scepticism when I wire up and fire up my (shortly
to be delivered?)<BR>> KAT5 units for the first
time.<BR>><BR>> On a general note, is proximity to 240v
mains c
abling likely to<BR>> degrade the network performance
significantly for any other (non KAT5)<BR>>
applications?<BR>><BR>> Any news on IR distribution? If
it's not possible to superimpose it<BR>> over a KAT5 signal, would
it be possible to run it over a separate<BR>> CAT5 cable, or use
the unused pairs on partly used CAT5's (say the<BR>> telephone
cables)?<BR>><BR>> All the
best<BR>><BR>> Nick<BR>><BR>> --- In
kat5-users@y..., "Keith Doxey" <kat5users@d...>
wrote:<BR>> > Hi Rehan,<BR>> ><BR>> >
KAT5 is totally Analogue<BR>> ><BR>> > During
development I deliberately tried to introduce interference<BR>>
and<BR>> > failed.<BR>> ><BR>> > I ran
a CAT5 cable down 4 floors with it strapped to a 3phase<BR>>
240/415V cable<BR>> > that was carrying in excess of 20
0Amps. For the remainder of its<BR>> run the<BR>> >
CAT5 was in able trays carrying a 6" diameter bundle of CAT5's
that<BR>> were<BR>> > carrying Ethernet, PBX, PSTN and
ISDN. Total length of the cable<BR>> run was<BR>> >
about 600 feet. No interference whatsoever.<BR>>
><BR>> > Please note I am not advocating that you should
install cable in<BR>> such a<BR>> > manner
;-)<BR>> ><BR>> > I also did a demonstration to
Mark McCall where I connected a<BR>> portable CD<BR>>
> player to one end of the CAT5 cable. By listening to either wire
of<BR>> the pair<BR>> > at the distant end the CD was
audible over the desired signal. The<BR>> output of<BR>>
> KAT5 was free from the CD signal.<BR>> ><BR>>
> I am not in a position to ship to the States just yet but do
have<BR>> global<BR>&g
t; > aspirations ;-))<BR>> ><BR>> >
Keith<BR>> ><BR>> > -----Original
Message-----<BR>> > From: Rehan Khwaja [mailto:rehankhwaja@y...]<BR>> >
Sent: 22 June 2001 21:25<BR>> > To:
kat5-users@y...<BR>> > Subject: [KAT5]
Interference?<BR>> ><BR>> ><BR>> >
Hi,<BR>> ><BR>> > I have a few
questions.<BR>> ><BR>> > How does the interference
of AC power lines for KAT5 compare with<BR>> > that of
coax? Am I correct in thinking that the transmission
is<BR>> > analog rather than digital? If so, does the
fact that the wires are<BR>> > twisted pair help with
interference from the AC?<BR>> ><BR>> > The
background to this is that I'm planning to retrofit my house
for<BR>> > audio and possibly video. I don't ha
ve a problem with the cost of<BR>> > coax but I've read that
you have to be careful not to run them close<BR>> > to power
lines or you pick up AC hum. I don't think that I'm
going<BR>> > to be able to be very careful about where I run
the cables, though,<BR>> > so I'm looking for a more robust
solution. Is KAT5 it?<BR>> ><BR>> > BTW,
I'm happy to see it "in production" - I remember reading
the<BR>> > plans for it on your website a while ago.
Also, will you ship to<BR>> the<BR>> >
USA?<BR>> ><BR>> > Thanks,<BR>> >
Rehan<BR>> ><BR>> ><BR>> > To
unsubscribe from this group, send an email to:<BR>> >
kat5-users-unsubscribe@xxxxxxx<BR>> ><BR>>
><BR>> ><BR>> > Your use of Yahoo! Groups is
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