Bending cable through 90 degrees?
Jon Parker
the room as part of it. I will have to route the 2 sattelite cables,
another co-axial possibly (the terrestrial antenna) and an ethernet
cable along the floor and around my fireplace. This will involve bending
the cabels through 4 right-angle corners.
Is coaxial cable bendy enough to be bent round 90 degrees?
--
Regards
Jon
Woody
news:MPG.24c1b1b83...@news.eternal-september.org...
As long as you curve it, no problem. If you do a 90 and it kinks
you almost certainly have problems.
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Woody
harrogate three at ntlworld dot com
Jon
says...
> As long as you curve it, no problem. If you do a 90 and it kinks
> you almost certainly have problems.
Gently does it then eh?
I'll also have to extend the current cables, how easy is this?
--
Regards
Jon
Charles Ellson
wrote:
If you're bending round the front corners of a fireplace then you're
almost certainly going to do a nasty to the cable. Where the cable is
inside a corner there is often the opportunity to position the cable
with a not less than 3" radius curve and position carpet grip either
side. If you've got the time and the tools it might be easier to
divert the cables under the floorboards (please don't tell us it is a
concrete floor) even if it is just for a few inches either side of the
front corners to provide small loops rather than bends; it is not
recommended to drill any holes without first prising up one of the
floorboards to check what is underneath.
Gary
"Jon Parker" <sp...@jonparker.plus.com> wrote in message
news:MPG.24c1b1b83...@news.eternal-september.org...
You can bend the cable but the signal will suffer.
You can not really bent it to 90 deg and expect it to work. you can do a
round bend as tight as you can without kinking the cable.
Gary
Malcolm H
"Jon Parker" <sp...@jonparker.plus.com> wrote in message
news:MPG.24c1b1b83...@news.eternal-september.org...
If it is impossible to make curves >5cm. radius, use one normal F connector
and one 90deg. F connector connected with an F connector coupler for each
coaxial cable corner. Ethernet is not a problem.
Bill Wright
"Malcolm H" <malc...@nospam.com> wrote in message
news:BrZ5m.10164$mZ1....@newsfe28.ams2...
I have had so much trouble with 'f' rt angle conns I threw all my remaining
stock away. Maybe there is a make somewhere that's OK, but I can't find it.
Bill
Tony
"Jon" <sp...@jonparker.plus.com> wrote in message
news:MPG.24c1bf788...@news.eternal-september.org...
Sounds to me like you should be leaving the job to someone else, if you need
to ask in here about such simple matters.
Jon
cha...@ellson.demon.co.uk says...
It's a concrete floor.
--
Regards
Jon
Jon
> Sounds to me like you should be leaving the job to someone else, if you need
> to ask in here about such simple matters.
You're probably right, however I'd rather have a go myself and learn
from it. If I fuck it up I can pay someone to rescue me, however if I
succeed I will have saved some money and learned something.
--
Regards
Jon
Gary
probably work fine. I have seen cable fully kinked in many places in a run
and it still worked .
The answers you have been given about the radius etc are all correct, but in
the real world things like that are rarely critical but if you aim for good
practice where possible the results will be reliable.
Give it a go and if it doesn't work then at least you know how to put it
right.
Gary
Vincent
Good for you! This is how I learnt (admittedly I was a child at the time,
but still...).
It makes me cringe when I see people having to call Electricians at a cost
of �60 callout fee just to flick a circuit breaker back on, or change a
fuse.
Last month I was talking to a guy in the queue for the checkouts at B&Q. He
was buying a brand new hedge trimmer to replace the identical �100 hedge
trimmer he purchased the week before, because he'd sliced through the mains
cable. To me that's a 5 minute fix involving 3 or 4 bits of heatshrink, a
pair of wire cutters, a soldering iron, solder, and a heat gun.
--
Vincent
Ato_Zee
> Deformed cables will have
> a step change in impedance and so cause added VSWR and added losses.
It's a bit of a tradeoff, you have a choice of cables of the right
impedance. Foam filled loose braid cheap cables will tend to
distort with sharp right angled bends (which won't matter if you
have few bends and plenty of gain in hand, bearing in mind
that the distortion covers only a small fraction of a wavelength,
and that there will be a negligably small blip on a TDR).
Solid dialectric cables will have slightly higher losses but
be less susceptable to tight bend deformation causing
losses, so for lots of tight bends (say more than 5, I'd
consider solid. You may have to go to a cable specialist
to find solid core, such as firms that stock much of
the Belden range, try
http://www.csedistributors.co.uk/cable/belden-cable/index.htm
RS Components and Farnell have online
mail order catalogues with local counters, should be
something there of the right impedance and diameter
to fit your connectors.
Most have on-line catalogues and spec sheets giving
minimum bend radius.
Vincent
news:esfm555ek5asvefr2...@4ax.com...
> Deformed cables will have
> a step change in impedance and so cause added VSWR and added losses.
I agreed with everything you said, but this point quoted above made me
think...
I admit it's been a long while since I've had to worry about SWR, so please
correct me if I'm wrong, but doesn't SWR only apply to transmitting stuff,
where the higher the standing wave ratio the more energy is reflected back
down the cable to the transmitter - at extremes burning out your power
transistors, but usually only reducing your transmitted power marginally?
--
Vincent