24 May
2009
24 May
'09
9:35 p.m.
On 24 May 2009 at 21:57, Tony Duell wrote:
I don;'t know the dates, but the 'C' and
'N' connectors spring to
mind. Probably a bit later, though.
N connector is 1940s vintage. I think the difference boils down to
materials. Nylon was first produced in 1935 and first found
commercial application in 1939, after the UHF connector had been
deployed. (The UHF connector uses a rigid phenolic insulator, which
was a mature technology, dating from about 1908). I suspect that
coax of the 1930s was rubber insulated covered with cotton or silk--
hardly a low-loss medium.
Materials make a big difference.
How many young engineers even know what "DCC" (as in "#18 AWG DCC)
stands for? But then, why should they need to? :)
--Chuck
IIRC the stnadard N connector socket has the same panel cutout as the
SO-239. Which makes it a useful upgrade for stuff fitted with the
latter connecotor
^^^
DE9, surely :-)
PL259_s are easy to terminate with a little practice and a good
soldering gun!
Unless you hae a crappy one where the insulator melts before you've
got the braid properly soldered....
Twisting two pieces of wire together is a lot
nicer than a PL259
To get closer to being on topic, try soldering 3 or 4 pieces of coax
to a DB9 connector to use as a RGB video feed and look at it on an analyzer, it
makes a PL259 look like
a real clean option.
Don;t get me started on the 'SCART' connnector used over here. This is
a 21 pin socket that takes a 20 pin plug (no, I am not joking, the
21st socket contact connects to the overall screen of the plug), it's
commonly fitted on domestic TVs, VCRs, DVD playes, etc. The signals
are stereo audio I/O, comoposite video I/O, RGB video (unidirecional,
using the composite video pin for sync, and so on). A worst RF
connector is hard to imagine!
-tony