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Yep.... even a shielded USB cable will act up.... Often because
the shield is not continuous or not terminated properly (or at
Thus, you need suppression from the ferrites molded on the cable
OR get wire longer than you need and figure out which torroid and
# turns you need to quiet it all down.
Clay Autery, KY5G
On 09/21/20 09:33, Lyn Norstad wrote:
more likely, an issue with RF entering the USB circuit thru
have experimented with many USB cables over the years, and
the only one I have found to consistently be trouble free is
the Tripp-Lite (1 foot or 6 foot) cable with built in
ferrite beads at both ends. (Available on Amazon for less
Sounds like its a USB port getting close to wearing out...
USB A-B is a lot less robust than USB C ports... IMHO
Clay Autery, KY5G
On 09/21/20 07:23, Alan Baker wrote:
It's possible that it's not just cable
length, it could just be movement of the cable and
proximity to 'something' else.
I've had intermittent issues with USB
disappearing and I know for sure that at least twice it
happened just after I reached over the back of the K3S to
check a different connector.
My 'cure' so far has been to unplug the
USB connector on the back of the rig and re-plug it,
whilst watching the Device Manager display on the PC it's
connected to. I have an extension lead on the USB cable
and unplugging it there and re-plugging has no effect.
Re-booting the PC has no effect. Of course it could be
that something is not quite 'seated' in the K3S, but as
all other I/O works 100% reliably, I have my doubts. As I
have a mess of cables behind the K3S, I suspect some form
of mutual coupling, which gets disturbed when I reach
over. I guess I should try some ferrites.
I'm taking chances by writing this, as
it's not happened for some time, so I better watch out
when I next switch on. :-D
------ Original Message ------
Sent: 20/09/2020 22:50:20
Subject: Re: [Elecraft-K3] USB Issue
too had a problem when I reconnected a USB cable to my
K3s. I found or so it seems the length of the USB
cable is a problem. When I connected a 1.25 meter
cable, the PC would see the K3s but would only RX with
no TX, when fitting a 1.5 meter cable, it could not
find the K3s at all. But when I tried a 600mm cable,
BINGO, all’s well, PC found my K3s TX & RX. So I
assume the shorter the cable the better, I am not a
techy whizz kid so you tell me why 900mm of cable
makes such a big difference? But it seems it does.
Maybe my friend Andrew G8BYB might pick up on this
thread as he may know more than me.