17 Feb
2006
17 Feb
'06
6:24 p.m.
From: ard at p850ug1.demon.co.uk
Hi
I've made a couple of these from cable, both starting from
RCA on both ends and BNC on both ends. Get the connector
you need from RS or other supply and make the cable. It
only takes a few minutes and doesn't require special
skills, other than using a soldering iron.
One can get adapters as well. Allied has a part #202-0835
that is RCA jack to BNC plug. They're only $2.63 but
I think they have a minimum purchase. ( BOMAR part# R0843 )
Dwight
Dwight
My unit has a BNC type connector (think
that's what it's called) on it. Mos=
t
composite monitors take RCA cables. Should I be able to find the right cabl=
Well, most decent composite monitors have BNC inputs, but anyway. Most
of the cheaper composite monitors have RCA phono sockets
e
off-the-shelf?
It's a standard cable in the UK, it was often used to link a BBC micro
(which also has a BNC socket for the composite output) to a cheap
monitor. I bought one from Maplin a couple of weeks back.
No idea if you can get them in the States. I think Maplin will ship
worldwide, but their postage charges are not that low.
-tony 
17 Feb
17 Feb
7:03 p.m.
Hi
I've made a couple of these from cable, both starting from
RCA on both ends and BNC on both ends. Get the connector
Don't forget there are 2 types of BNC connector, 50 Ohm and 75 Ohm. I am
told the centre pin diameter is different between them, and using the
wrong oen can cause intermittant connections or damage to the socket.
For video applications, you need a 75 Ohm plug. Almost all other
appications (test equipment, ethernet) use 50 Ohm.
you need from RS or other supply and make the cable.
It
only takes a few minutes and doesn't require special
skills, other than using a soldering iron.
At one time the Maplin cataloge contained instructions for fitting a BNC
plug. They were hilarious!. They told you to remove xx.xx mm of
insulation from the cable (yes, to the nearest 1/100th of a millimetre).
Clearly an imperial dimension that had been converted by somebody who
didn't think about it.
In fact the BNC plug is very easy to wire. Probided you remove enough
outer insulation from the cable (1" is plenty), every subsequent cut is
against a part of the plug you've fitted (trim the braid around the
outside of the metal ferule, the inner isulation against the end of the
ferule, the inner conductor against the end of the flat insulator, etc).
-tony
10:53 p.m.
For video applications, you need a 75 Ohm plug. Almost
all other
appications (test equipment, ethernet) use 50 Ohm.
Sounds a little off. Cables are important, with impedance
varying with diameter, _Terminators_ are important, coming
in the 50, 75 Ohm varieties mentioned, but the connector
itself being 50 or 75 Ohm? First I've heard of this.
The connector rear half can come in sizes to match the cable
OD, that's about it by my understanding. A mechanical, not
electrical difference.
John A.
important? probably not. thread drift? probably!
18 Feb
18 Feb
1:51 p.m.
For video applications, you need a 75 Ohm plug.
Almost all other
appications (test equipment, ethernet) use 50 Ohm.
Sounds a little off. Cables are important, with impedance
varying with diameter, _Terminators_ are important, coming
in the 50, 75 Ohm varieties mentioned, but the connector
itself being 50 or 75 Ohm? First I've heard of this. 
19 Feb
19 Feb
12:48 p.m.
On Friday 17 February 2006 10:53 pm, John Allain wrote:
And then there are the couple of ARCnet cards I have around here someplace,
along with terminators (I hope!), that are using 62 ohms impedance...
--
Member of the toughest, meanest, deadliest, most unrelenting -- and
ablest -- form of life in this section of space, a critter that can
be killed but can't be tamed. --Robert A. Heinlein, "The Puppet Masters"
-
Information is more dangerous than cannon to a society ruled by lies. --James
M Dakin
For video
applications, you need a 75 Ohm plug. Almost all other
appications (test equipment, ethernet) use 50 Ohm.
Sounds a little off. Cables are important, with impedance
varying with diameter, _Terminators_ are important, coming
in the 50, 75 Ohm varieties mentioned, but the connector
itself being 50 or 75 Ohm? First I've heard of this.
The connector rear half can come in sizes to match the cable
OD, that's about it by my understanding. A mechanical, not
electrical difference.
John A.
important? probably not. thread drift? probably!
6733
days inactive
6735
days old
4 comments
4 participants
participants (4)
-
allain＠panix.com -
ard＠p850ug1.demon.co.uk -
dwight.elvey＠amd.com -
rtellason＠blazenet.net