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Single coax
This thread has 18 replies. Displaying posts 16 through 19.
Post 16 made on Tuesday July 30, 2002 at 03:57
ItsColdInMN
Long Time Member
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Actually, I think I got the idea from some of that 2x2 wiring with the 2 coax and 2 CAT5 cables. The best possible reason I could come up with as to why I ran the extra cable was in case I wanted to feed a signal from one room back to my wire closet with some type of signal on it that couldn't have been run on the primary coax. My primary coax cable carries pretty much every channel from 2 through 700. With the gaps wherever my cable company puts them. So if I wanted to send a modulated signal back through the line I'd have to change it's frequency or put it on an unused channel. Easier to use a seperate coax.

No, I'm not an installer, wish I was, but working on becoming an electrician, still have to get through school though. I've been doing wiring and home theater stuff since I was a young teen. Bought my first stereo system when I was 12 from money I made mowing lawns (And it wasn't a little shelf system either). I've just been hooked ever since.
Post 17 made on Friday August 2, 2002 at 18:28
Ernie Bornn-Gilman
Yes, That Ernie!
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Here's another way this scheme can work, but you have to have heard of the hardware to come up with it -- the UVSJ. It is a Uhf Vhf Separator-Joiner. You feed UHF in one port, VHF in the other, and get a combined signal out of the common port. Or UHF and VHF combined, as off of an antenna, into the common port, and separate bands out of the U and V ports.

Here's today's setup --
I have a client who has a DSS receiver in the room above the cable closet. He wants to send the DSS output throughout the house and thinks that running a piece of cable to the closet will be a truly irritating experience.

Okay, so we modulate the output of the DSS onto a cable channel. Now what? I ask a ridiculous question: what does he actually watch in the room with the DSS receiver? Answer: DSS and channel 9 (he works there). He does not care about cable channels above 13. Enter the UVSJ.

The UVSJ hails from antenna days, and is guaranteed to separate UHF from VHF. Since cable 14 - 22 is in the VHF band, that will go through; what is not specified is what will happen to signals from 23 on up. Presumably they will pass through up to some point, then get snowier and snowier....

Okay, so we get out two UVSJs. At the cable closet, we connect the cable to a "V" port, and connect the common port of the UVSJ to the existing cable. This sends channels 2 - 22 and 23 to ?? up to the TV. At the TV, we connect that cable to the common port of a UVSJ. Why another UVSJ? You'll see in a moment.

We modulate the DSS signal. Upstairs, the output of the modulator goes onto the "U" port, which puts it onto the cable going down (or coming up, if you wish) to (from) the cable closet. In the cable closet, we take the modulated channel off that cable at the "U" port of the UVSJ, then use a standard 2-way splitter, backwards, to mix the modulated signal with the cable feed before the cable feed is split and sent to the rest of the house.

Again, one signal goes one way and the other the other. We have always head that these simple passives are bidirectional. This stuff proves it.


A good answer is easier with a clear question giving the make and model of everything.
"The biggest problem in communication is the illusion that it has taken place." -- G. “Bernie” Shaw
Post 18 made on Sunday August 11, 2002 at 01:06
Ernie Bornn-Gilman
Yes, That Ernie!
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A word about your goals--
At least out here in LaLaLand, California, electricians and audio/video installers are very very different animals.

For instance, most electricians will not know why they cannot run cable or video feeds from the source location to point A, from A to B, from B to C, from C to D, etc. They will usually make separate home runs if told, but not always unless watched.

I would say that A/V installers generally are fuzzy on 120 volt electrical theory and operation. They are either wire monkeys, who know how buildings are constructed and know how to get wires from any point to any other point, or are hobbyists who have learned how to connect and use the equipment, then have expanded to know how to install this stuff in homes. Most installers are some of both.

Also, out here, you can do low-voltage wiring with a general electrician's license. There are a lot of different low-voltage wiring techniques and needs that are unnecessary for audio/video work. It seems to me easier to pass the general electrician's license exam than the low-voltage specialist's exam, so doing audio/video under an electrician's license seems to me to be the way to go.

Food for thought, I hope.

Ernie
A good answer is easier with a clear question giving the make and model of everything.
"The biggest problem in communication is the illusion that it has taken place." -- G. “Bernie” Shaw
Post 19 made on Sunday August 11, 2002 at 13:56
ItsColdInMN
Long Time Member
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I'll do the dishes, thanks for the advice too, I'd be willing to bet things differ here in MN. I'm hoping to be an electrician, like Mr. Larry Fine, on here. I have a lot of friends in various trades, and they all say the same thing, the electricians are the highest paid. I've been doing electrical stuff since I was 9 years old, my grandpa was an electrician, when I was 14, I wired the addition on my parents house, passed both inspections with flying colors too. I don't plan on doing alot of work in the low-voltage or A/V field...but if it can help me make more money, I will. I like wiring for A/V stuff, I've ran and installed every piece of equipment in my house, and done a lot of AC wiring too. I've heard low voltage guys make up to 30 bucks an hour. That's less than my wife makes. I've heard Electricians can make twice that. So, I'm heading down that road. Who knows though....things may change.
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