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USB-A male to USB-A male with a USB-C adaptor
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Hello. I purchased this USB-A male to USB-A male cable for an application involving an aircraft experiencing RFI interference with radios using typical USB cables. In short, USB-A to USB-C cables I tried, even with ferrite chokes, caused radio interference when connected to power on the USB-A end and an iPad on the USB-C end. One of the issue is the close proximity of the USB cable to the aircraft antenna, but that can't reasonably be changed.
The linked cable above is essentially double-shielded so I thought I would try it. I purchased a USB-A (female) to USB-C (male) adaptor to go on the iPad end of the cable. I just learned something I didn't know prior - USB-A male to USB-A male cables don't pass power in the typical way? I'm asking that to confirm. I am able to use a multimeter to check for voltage on the pins with the other end plugged into a USB wall charger and can pickup 5V on a pin - is there any way to make this cable work for my application with some kind of adaptor?
the M-M cable swaps the RX and TX pins but the F-F coupler does not. I attempted to rewire the cable so that the pin configuration would be the same as if it was the computers direct port, however that didn't work.
You clearly have wrong M-M cable. In specs, there no such thing, people make all sorts of crazy cables, so you got a wrong one.
More, you can't "rewire" the cable easily, without compromising the super-speed signal integrity, it is a very delicate solder job. And even if you manage to do so, 70cm of cable and two extra connectors will likely kill the signal anyway, or make it marginal, so the link will be unstable.
So your solution would be to search deeper and find an extender with proper environmental rating, or order a custom-made cable.
One possible problem is that USB female to female adapters violate the USB spec, and by violating the spec things tend to stop working. Under the USB 3.x spec a male to male cable is supposed to swap the Tx and Rx lines, so your complaint on this from not understanding the purpose of these cables. These are made for host to host communications, and like an Ethernet or serial cable for host to host communications the Rx and TX lines will crossover. It looks like you are trying to hack together a passive extension cable. Any extension to a USB cable is supposed to be an active device. Most people will just use a hub, but boosted cables exist for this purpose too.
The "superspeed" data lines on USB 3.x cables are quite delicate and introducing two extra connectors in the data path without some active device to compensate for it is just asking for it to not work. This isn't like speaker wire or a telephone cord where you can just twist the wires together and expect it to work, this is a multi-gigabit per second tuned transmission line. I'm surprised you got it to work even at USB 2.0 speeds. A properly wired male to male cable would not have the USB 2.0 data or power wires connected. I don't know what kind of cable that is supposed to be, only that it is not following the spec.
If you want this to be reliable then you need to follow the spec and find an active extension cable. I don't know anything about this product but it popped up easily enough in a search and it appears to follow the USB spec: https://www.datapro.net/products/usb-3-0-active-boosted-extension-cable.html
That's just an example, again I know nothing about it, I only use it to show such things are available and to give an idea on what they might cost.
At a minimum I'd suggest using any of a number of passive USB extension cables that are on the market. These violate the spec too but they still appear to work for most people regardless. One thing is that they introduce only one additional connector interface, not two like you did. Another is that they will be wired correctly for host to device communications, removing any need to rewire and disturb the carefully constructed transmission line.