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MuscleTang mod project thread (1971 M-Mach 1)
(04-26-2019, 02:00 PM)tony-muscle Wrote:
(04-26-2019, 12:54 PM)Don C Wrote: Don has all 4 in a set
http://www.ohiomustang.com/store/order_p...itemid=751

Perfect. One more project to the list. Hey, this is the first project in Page 12 of the list.

I am sure glad i didnt draw up a list. It would have made for daunting reading. Though once you reach that mid point theres a sense the finish line coming into view Wink

Steve
1971 Grandé
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For those readers that may have a Retrosound stereo. I installed mine a few years ago but I always had this nagging issue that I couldn't play USB music when the car was on. All pointed out to electronic interference so I didn't do much troubleshooting because I knew my spark plug wires were old. Fast forward two years and I finally replaced the wires with Accels's 8mm. The problem persisted so I just tried a simple test. Since the USB cable was long I had coiled it behind the radio. I uncoiled it and run it on the floor along the console away from any other wires. That simple solution did it. It was working with no problems. I then run it between the console and the carpet and it worked great. The key is not to run the USB cable next to any other wires. It was very close to the antenna wire so that may have been the culprit. As an added measure I clipped one of those ferrite RFI suppression filters to the USB cable. I also clipped one to the the positive wire to the radio. This is one more issue scratched off the list.

        [Image: 20160929_171923_edit2_small.jpg]

1971 M-Code Mach 1 w/Ram Air, 408 stroker, 285/291 0.558" roller cam, Blue Thunder intake, TKO600, Hooker headers with electric cut-offs, FiTech EFI w/ RobBMC PowerSurge pump
Strange center section with Truetrac, 3.5 gear and 31 spline axles, 4-wheel disc brakes
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Making a small neat coil of excess wire can have unintended consequences, especially when it is next to steel or iron. Having several individual insulated strands of wire in the cable, whether the cable is shielded or not, adds to the unknown consequences. The coil of cable forms what is called an inductor (also called a choke). Inductors are used to smooth out electrical waveforms in a circuit, and can completely block audio signals, as well as other frequencies. The RFI filter you added to it is also a type of inductor, so if your stereo seems to lack bass or high frequencies you might want to try removing it, see if it helps or not.



“If you can't explain it simply, you don't understand it well enough.”
--Albert Einstein
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(05-04-2019, 06:34 PM)Don C Wrote: Making a small neat coil of excess wire can have unintended consequences, especially when it is next to steel or iron. Having several individual insulated strands of wire in the cable, whether the cable is shielded or not, adds to the unknown consequences. The coil of cable forms what is called an inductor (also called a choke). Inductors are used to smooth out electrical waveforms in a circuit, and can completely block audio signals, as well as other frequencies. The RFI filter you added to it is also a type of inductor, so if your stereo seems to lack bass or high frequencies you might want to try removing it, see if it helps or not.

Interesting point that you bring up here with the coil of excess wire. In this case it was a USB wire that I can't cut and patch. In other cases, if you didn't want to cut it, what would be the best way to deal with excess wire. I have couple places in the car where I have coiled excess wire and now I am thinking about it.

        [Image: 20160929_171923_edit2_small.jpg]

1971 M-Code Mach 1 w/Ram Air, 408 stroker, 285/291 0.558" roller cam, Blue Thunder intake, TKO600, Hooker headers with electric cut-offs, FiTech EFI w/ RobBMC PowerSurge pump
Strange center section with Truetrac, 3.5 gear and 31 spline axles, 4-wheel disc brakes
  Reply
Try to meander it around or make a larger loop, 10 or 12 inches in diameter. Don't wrap it around metal.



“If you can't explain it simply, you don't understand it well enough.”
--Albert Einstein
  Reply
(05-04-2019, 06:34 PM)Don C Wrote: Making a small neat coil of excess wire can have unintended consequences, especially when it is next to steel or iron. Having several individual insulated strands of wire in the cable, whether the cable is shielded or not, adds to the unknown consequences. The coil of cable forms what is called an inductor (also called a choke). Inductors are used to smooth out electrical waveforms in a circuit, and can completely block audio signals, as well as other frequencies. The RFI filter you added to it is also a type of inductor, so if your stereo seems to lack bass or high frequencies you might want to try removing it, see if it helps or not.

In regards to the RFI filter and loss of bass, since the filter is in the USB cable which is passing a digital signal, it shouldn't affect sound quality, right?

        [Image: 20160929_171923_edit2_small.jpg]

1971 M-Code Mach 1 w/Ram Air, 408 stroker, 285/291 0.558" roller cam, Blue Thunder intake, TKO600, Hooker headers with electric cut-offs, FiTech EFI w/ RobBMC PowerSurge pump
Strange center section with Truetrac, 3.5 gear and 31 spline axles, 4-wheel disc brakes
  Reply
That's a good point, and you're correct, it shouldn't.



“If you can't explain it simply, you don't understand it well enough.”
--Albert Einstein
  Reply
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