Kind of simple question matching impedances/resistances on twin-lead

Yep- you sure do sound sophisticated- I'm convinced. Isn't it great, another ignorant low life found its way to NG to ask about petty dollar store "electronic" accessories....

Nope, I was not clear. It's an outside antenna that I cut into thirds. Think more of a phone line feeding several rooms. I wanted to make the unused or last two cut portions useful again just for closure, as we say.

I did not quite get this. The twin-lead just needs a balun transformer to go into the TV. An existing internal loop antenna appears to operate independently.

You or I was not clear that there is a real outside antenna, the twinlead antenna wire is just that, nothing more, quote the raven.

He was just a fussbudget. Imagine, after inventing calculus, he gets all bent out of shape because Leibniz invented it too, and a far more useful version we use d/dx. Poor Leibniz. Newton was NASTY.

If I could ask questions in a way that suggests I might understand the answer, I probably would not need to ask at all but could simply find the canned answers on the internet.

I see your point. This was probably too advanced a newsgroup to ask questions in or the people in this newsgroup are tired of questions they consider ambiguous.

I wonder if I could suggest that you need to answer questions so I could understand my own question.

You know the routine if you ever taught college: I gather what you meant to ask me was......

an

unused

both

thirds.

An antenna lead isn't like a phone line. It is a transmission line, and should be terminated at one end with a resistance equal to its characteristic impedance to minimise reflections (ghosts) - the antenna inputs on TV sets always have such a terminating resistor built in.

Probably not a good idea.

which

it

transformer

operate

The coaxial cable normally used to hook up TVs has a characteristic impedance of 75R, so the coax socket on the the TV is designed to present a 75R resistive impedance to terminate such a cable. As you say, the internal loop antenna operates independently.

CTV monitors, which are often used to display the same picture in different places, tend not to have a built-in 75R termination, and rely on the installation technician plugging in a 75R terminating resistor (mounted in a 75R connector) on the monitor at the end of the cable.

The balun transformer you use to convert from 300R twin cable to 75R coax is a 2:1 step-down transformer, so that the 75R termination in the TV set looks like a 300R termination to the 300R twin cable

twinlead

invented

all

useful

Newton invented fluxions - I don't think that his notation was any less useful than Leibniz's, but because he didn't publish it, it was never widely adopted. Newton wasn't just nasty to Leibniz - his treatment of Hooke adn Wren was pretty shabby too.

the

We do a lot of that here. The trick to getting a good answer here (as in most forums) is to pose concrete questions based on what you want to achieve, expressed in terms you do understand, rather than waffling on about stuff you don't understand.

I've spent about thirty years solving people's electronic problems, and it always takes a while for me to drill down to the level where I understand the client's problem in a way that admits of an electronic answer - and I'm better at it than most.

---------- Bill Sloman, Nijmegen

Now the more you trash talk, the more likely I will stay on for a while. It's not every day I get to talk trash to pure trash. So refreshing.

I can see you now Fred. Right there on Rodeo Drive with your Gucci soldering iron. There's nothing wrong with being home-schooled as you were. Did you read much about resistance in the Bible? Ohms and hymns.

I'll bet you believe in creationism too, don't you? Hmmm?

It's okay. Not all pathways are conductive. Some just oscillate around the simpleton.

That's kind of what I think about Florida in general, populated by ignorant, bible thrashing, and resorting to violence since words are beyond their illiterate capabilities. May you learn to speak and carry on the tradition. I am not talking about the northerners who retire to Florida and bring literacy and science, and teachers for their universities.

Plonk