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Hello Jeremy

My first question is:? Where did you buy the USB cord?

Also 5v 3a is right close to being not enough current for your pi-4. 4-5a would be better. I mean by the time it reaches your pi its at max 3a. I don't think it's your cord. 3ft should not* be enough to shortchange you. That to me would not be that much of a voltage* drop. Current yes by all means. 3a at 3 feet. That's quite a lot. So up* your output current for the loss of voltage from your 3ft cord.

Now have you tried to power this at home with a 5v wall wart with that 3 ft cord?? I don't think it's the cable. Your right at the edge of your current with the Powermax 5v 3a supply. Get my drift?? Up your amperage and try again...

HTH? 73

Hi all in the group!

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Been doing lots of Google searches, and while years ago I found this kind of info for the old micro-USB cables, I haven’t found similar information for USB-C – and I figure the Pi Ham Radio group is my best bet.

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I’ve got a Pi-4 8GB model, with an Argon One M.2 case and Samsung SSD as the boot device.? I’m building out this device for portable logging/digital mode usage when I’m on POTA activations – either by VNC from a tablet, or a small portable screen mounted in my radio case.

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So the problem I have is with voltage drop – I power the Pi via a PowerWerx USB-Buddy – which provides 5v DC @ 3A, connected to a Bioenno LiFePo4 battery.? In my testing here at home, using a 1ft long USB-A to USB-C cable, it works without any problems.? But, I wanted a longer cable, so I went to a 3ft cable from the same maker.? Once I used that cable, I was immediately getting low voltage warnings – so obviously I’m getting voltage drop on the longer cable.? But I’m having trouble finding heavier USB-A to USB-C cables to avoid voltage drop across that length.

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Anybody have knowledge of any good cables that fit the bill???

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Thanks!

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Jeremy, NQ0M

-- 
73, de Vince KD7TWW
In what year did the FCC mandate the 1500 Watt PEP limit for amateur radio station
power output? - Motorola Corp was formally named
"Galvin Manufacturing Corporation" (1928–1947)