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Dave. Certainly 5.5v wont hurt the pi. But he has a voltage drop because his powerworex is only at max of 3a unit with the 3 ft cord.? Also what I would do if it were me. I would ohm out the 3 ft cord from one end to the other. And see how much resistance there is? That way you can calculate the drop in current by Ohm's law pretty easy. So I don't think it's his USB cord. The cord is only amplifying his situation...? 73

*Jeremy, You got a Powerwerx USBbuddy? 5v 3a???

It looks like Powerworx does sell/have a 4.8a round model (Panel mount dual usb 4.8a)? But first. Have you tried the 3ft cord at home with a 5v wall wart??? I say this because most pi kits come with a 5v 3a wall wart and a 3 ft cord attached? Mine did when I bought the pi kit.? Raise the voltage it will increase the current

On 07/12/21 3:56 PM, Dave R via wrote:

How do you "up your output current" in this situation??

Maybe raise the Voltage to get same power on a given conductor? 5.5Vdc won't hurt anything. Beware of smart USB sockets that limit power. 73

On Mon, Jul 12, 2021, 14:42 Vince A <vince@...> wrote:

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

On 07/12/21 3:13 PM, Jeremy Utley via wrote:

Hi all in the group!

?

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.

?

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.

?

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.

?

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

?

Thanks!

?

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)

-- 
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)