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| shmokes:
I drew a picture of my setup so my descriptions will hopefully make more sense. I did double up the power cables. So on the CAT 5 cable I am using all 8 wires. It does strike me as crosstalk, or at least EMI. For example, if I plug in the power, but I disconnect the cable at my splice, I can get phantom signals simply by holding the two cables on either side of the splice, one in each hand. I don't even have to be touching the ends of the wires on the cable running up to the steering wheel. I just grip that wire in my fist, and then when I touch the ends of the wires on the cable coming from the pedal base the PC registers signals as though the gas and brake pedals are being pressed. It really seems like the load is just too much for the cable, I think, since everything tones out fine, and everything (including the pedals) work perfectly so long as the power is not plugged in. I thought/hoped doubling up the power cables would give enough throughput, but something's not working and that is my prime suspect. By the way, there is a USB cable signal at one point in the equation. That DB25 connector has two cables coming out of it. One is the data cable running from the pedal base to the wheel, the other is a USB cable running from the wheel to the PC. --- Quote from: patrickl on September 08, 2008, 04:21:46 am --- I guess you could try routing the power over a separate cable, but that would mean a lot of soldering again and a pretty ugly result too. --- End quote --- This is what I'm thinking I'll have to do. I suppose I could use quick disconnects to make the break in that cable. Ughh . . . the thought of cutting all that work off and starting again from scratch is not pleasant. By the way, the output of the power brick is .75 amp at 24V. I thought for sure that doubling up the wires would be plenty, especially considering the load that goes over the wires in POE (power over ethernet). That's kinda why I'm thinking that I'm getting crosstalk at my splices. It seems to me, going on little more than gut, that these wires should be able to handle the load. |
| ChadTower:
Some 5e is better than other 5e. You could simply have a 5e cable that is manufactured at the low (or under) end of the specs. Hate to say it but Cat6 may be a lot more likely to do what you're trying... much higher specs and is easier to get solid core. |
| shmokes:
Oh . . . actually it is a cat 6 wire (stranded). Cat 5e jack, though. |
| ChadTower:
--- Quote from: shmokes on September 08, 2008, 11:24:20 am ---Oh . . . actually it is a cat 6 wire (stranded). Cat 5e jack, though. --- End quote --- Really doubtful there is any crosstalk going on in the jack if your current is within the wiring specs. It's probably happening where you untwisted the pairs. That really undermines the spec. |
| Ed_McCarron:
--- Quote from: ChadTower on September 08, 2008, 11:03:14 am --- Some 5e is better than other 5e. You could simply have a 5e cable that is manufactured at the low (or under) end of the specs. Hate to say it but Cat6 may be a lot more likely to do what you're trying... much higher specs and is easier to get solid core. --- End quote --- Not necessarily true. Cat (5,6,etc) gets its noise immunity via the balanced drivers at each end when used in an ethernet network scenario. Passing DC (even fast-cycling DC like data...) its just plain, old, skinny wire. I go nuts trying to talk people out of running RS-232 over any distance when they tell me "But its cat6... It should be better than shielded twisted pair..." |
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