On 13 May 2005 09:41:26 -0700, wrote:

Take a look at:http://sosnick.uchicago.edu/BNC_50_75.html
And then look at the BNCs on your equipment.
Unless all of your cables and equipment is new, as in since
~2000, I bet you have a lot of 50 Ohm BNCs in your facility.
It is real simple: plastic "inserts" in the business end mean
you have a 50 Ohm BNC. And for analog/NTSC it doesn't
matter.

Terry

Pacific Radio has always specialized in 75 Ohm BNCs. They are THE
place to go for that sort of thing in the Television Capitol of the
World. And they had them well before the year 2000.

http://www.computermodules.com/broad...aster-fd.shtml

The worst thing that ever happened to TV is stupid coaxial ethernet.
Before then, 50 Ohm BNC jumpers were very rare. I don't know anything
about Trompeter patch bays. We always use ADC.

All I know is that talking with my friends who work in
TV around the central Kentucky area are laughing at the
pennies saved versus the dollars that will now have to be
spent on upgrades. Kind of a mini Y2K event where penny
wise pound foollis was the logic. Although to be fair from what
I have read in the amphenol catalog, there was no measureable
difference between 50 and 75 ohm in the NTSC universe. Kind
of like a retired cobal programer who was shocked to find stuff he
had written in the early 70' was still mission critical software that
hadn't
been upgraded because "it worked". He made a bundle off that mess.
Non of the recent Computer Science grads couldmake heads nor
tails of 30 year old code.

My TV friends have "funny" stories about when a 50 ohm termination
got into the 75 ohms video system. Pulls synch and video down, and
once you have seen it you are foreverer "learned", but that first time
is
a real dozy!

Terry

On 13 May 2005 11:46:19 -0700, wrote:

All I know is that talking with my friends who work in
TV around the central Kentucky area are laughing at the
pennies saved versus the dollars that will now have to be
spent on upgrades. Kind of a mini Y2K event where penny
wise pound foollis was the logic. Although to be fair from what
I have read in the amphenol catalog, there was no measureable
difference between 50 and 75 ohm in the NTSC universe. Kind
of like a retired cobal programer who was shocked to find stuff he
had written in the early 70' was still mission critical software that
hadn't
been upgraded because "it worked". He made a bundle off that mess.
Non of the recent Computer Science grads couldmake heads nor
tails of 30 year old code.

My TV friends have "funny" stories about when a 50 ohm termination
got into the 75 ohms video system. Pulls synch and video down, and
once you have seen it you are foreverer "learned", but that first time
is
a real dozy!

Terry

The only terminations I ever use are the ones built into the
equipment.

wrote

All I know is that talking with my friends who work in
TV around the central Kentucky area...

Terry


Hey Terry, I didn't know you guys had electricity in central Kentucky. You
really have tv's too?

;-)

Jack