RG-174 is a mini 75 ohm cable that I have seen work well in RGBHV cables up to 100 feet. Calrad in Hollywood (
www.calrad.com, 323-465-2131) uses it for multiple cables and has single cables of different lengths available with RCAs, BNCs, or combinations.
You have all pretty much hit the high points of my oft-repeated rant about not using RG-6 for video...using only copper-core when low frequencies are involved, such as LNB signals, for instance.
Somebody mentioned that RG-6 does not have the freeqs for video, if I am quoting correctly. I disagree totally. If it will go to 2 gigaHertz, it will probably handle any video we can throw at it!
QQQ addresses the other issue, that you can't solder to aluminum, so crimp connectors must be used. Or F connectors plus adaptors, a sure-fire way to have to do a free service call some day.
On 10/09/03 10:27, Obiwan-Kanewbi said...
It's more than the core. The braid has a lot to
do with quality of signal transfer for baseband.
Aluminum versus Tinned copper, and others.
This leaves us with that last little niggling detail, the aluminum braid and foil. What is it about copper braid that makes it better for baseband? Or do all the other drawbacks of copper-clad steel RG-6 conspire to make one think that the copper braid of RG-59 makes the difference? Aluminum does have higher resistance than copper, and it most likely has a different speed of propagation, so the aluminum itself should probably (any bona-fide experts out there have comments?) disqualify RG-6 from long runs (and of course long runs is where its excellent frequency capability is most useful) to avoid timing discrepancies between the core and the shield.
Back when I was using RG-59 for antennas, I used a Belden model with solid copper core and aluminum foil and braid. Somebody with way too much time should find some of that and compare it to ordinary copper-braid RG-59 to see if there is a performance difference.
How many of you guys use Rg-6QS for basic coax
tv distro? I use it but I really hate terminating
that stuff!
It's what I use all the time.
I hate it. My best luck terminating it has been with Augat snap-n-seal connectors. They almost always just push on when the cable is cleanly stripped with a clothes-pin type stripper.
I have had email discussions with a Belden tech rep who agreed that there is one reason to use Quad shield: the next installer that comes in there, or the client's know-it-all friend, cannot possibly say, "oh, they didn't use the good stuff, did they?" None of us needs the headache of educating a customer as to why dual shield might have a problem, say, inside a transmitting tower, but NOWHERE on his premises. It is easier to give in and use the quad.
As a case in point, I did an antenna system in 1994 with Belden dual shield RG-6 and PicoMacom factory assembled dual-shield RG-59 interconnects, feeding over 400 TVs and fifty FM receivers in a store, about as close as you can get to the Los Angeles transmitting towers. No ghosts, no interference, no signal level problems, no hum, no problem.
This message was edited by Ernie Bornn-Gilman on 10/09/03 13:12.
