Finding it terminated with RCA plugs may be a bit of a challenge, but some shops will do this for you or you can buy F-to-RCA adapters for a buck or two each.What is the difference between using a line output converter (PAC SNI-15 for example) and just a regular speaker wire to RCA adapter (JL Audio XB-CLRAIC2-SW for example)? It's certainly likely to be much cheaper than RG6. You don't even need RG59 for the audio, either any decently-shielded audio RCA cables will do fine - although you CAN use RG59 if you can find a bunch of it cheap. pph, and even DVD playback doesn't approach that.) RG59 is just fine at 10 MHz and down. (That would be good for 800 lines horizontal res. But baseband (composite) video, non-HDTV, stops at about 10 MHz at the absolute most. RG-6 is all but required for modern cable TV setups because their bandwidth is well over a GHz and it attenuates those high frequencies a lot less than RG-59, and its leakage is far lower than other cables too. If you want to do this right, you don't even need to splurge on RG-6. Now even if you wire all this up correctly, your audio lines will likely pick up all kinds of AC hum, and the video probably won't be able to sync because it's picking up the same - but with visual effects instead of audible. ![]() Even though the shield side of all those RCA jacks may appear to be common, they aren't "close enough" to each other electrically at high frequencies. Don't even think about using a single ground connection for the L and R AND video. ![]() You could get away with using a single ground connection for audio L and R, but you still need two separate live signals in addition to the ground. The center conductor of the RCA jack at the source has to go to the center conductor at the destination, and simlarly for the ground. You have to be certain that you don't interchange these. In each case you'd connect one of the wires of the pair to the "live" wire in the RCA, and one to the shield. One each for the video, L audio, and R audio. If you want to try it anyway, you would need THREE runs of speaker wire. It's also the wrong impedance, which is important for video. Especially if you're running tens of feet of cable. The reason zip cord isn't the right thing is that it isn't shielded and these circuits are pretty sensitive to noise. The fact that it's wrapped around the "live" wire, in the form of a braid or foil, performs a second function: It provides shielding against noise pickup by the "live" wire. The shield provides the ground connection back to the signal source. It's connected to that shield you didn't understand the need for. The ground connection provides the return path. You can't just push and pull electrons out and in the "live" connection without having someplace for them to go, or to come from, respectively. It provides the return path for the signal. The "ground" is the shell of the RCA plug. In the RCA jack the center conductor (where the hole is, or the pin on the RCA plug) is the "live" connection. ![]() In unbalanced audio and video circuits (which these are) each signal needs its "live" connection and a "neutral" or "ground". I'm afraid you really don't have the beginnings of a clue here. For the audio, can I attach one to each of those two conductors?No. Quote:Originally posted by Noel:ok, then I was using it as a single channel. Any idea what might be going wrong, and what I can do to fix it?Thanks And related to this, how would I do the same with audio? I've got a mini->RCA cable which I was intending to cut up and splice in speaker wire as with the video. ![]() Then in the living room I've got it spliced back to an RCA connector and into the TV. I cut that in half (it appears to have a part of it shielded, why?), and spliced it with some speaker wire, both channels mushed into one. Here's what I'm doing:Composite out (through an adapter) on the radeon has an RCA plug going into it. However, it does not appear to be this time. It's a long trip because I can't drill through the wall (it's too thick)So I'm trying to extend it using speaker wire, which I have seen work before. Hey everyone, I tried searching, but since 3 letter 'words' don't work, 'RCA' (the key part of this post) didn't work.So I'm trying to run the TV out on my Radeon 9500pro to the TV in the living room.
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |