Elecraft K3S usb and USB data only cable

[IK4EWX]

I have seen on the P3 that some little spurs are presents every two three khz
about -125dBm when the K3S dialogue with my Intel NUC pc, when using
Elecraft K3 Utility program or my logging program, winlog32.
I am thinking to use a data only usb cable (without the 5V wire from the pc
power supply, that I presume is causing this low RFI).
Is it possibile to connect the K3S to pc with a data only usb cable?
Does the K3S really need the external 5V? Does the K3S need the third wire
(ground)?
Thanks and 73,
Ian IK4EWX



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[Elecraft mailing list]

You would be far better off finding a USB cable with built-in ferrite to handle the small noise. The noise is most likely coming from the NUC as part of its USB polling regime, and being transmitted along the shield of the USB cable. Using the ferrite should eliminate this issue. You don’t need to buy a special cable, passing the cable through a ferrite (expert K9YC says #31 core is the best to use) several times should take care of things for you.

73!
Jack, W6FB

> On Jul 27, 2019, at 2:23 AM, IK4EWX <[hidden email]> wrote:
>
> I have seen on the P3 that some little spurs are presents every two three khz
> about -125dBm when the K3S dialogue with my Intel NUC pc, when using
> Elecraft K3 Utility program or my logging program, winlog32.
> I am thinking to use a data only usb cable (without the 5V wire from the pc
> power supply, that I presume is causing this low RFI).
> Is it possibile to connect the K3S to pc with a data only usb cable?
> Does the K3S really need the external 5V? Does the K3S need the third wire
> (ground)?
> Thanks and 73,
> Ian IK4EWX
>
>
>
> --
> Sent from: http://elecraft.365791.n2.nabble.com/
> ______________________________________________________________
> Elecraft mailing list
> Home: http://mailman.qth.net/mailman/listinfo/elecraft
> Help: http://mailman.qth.net/mmfaq.htm
> Post: mailto:[hidden email]
>
> This list hosted by: http://www.qsl.net
> Please help support this email list: http://www.qsl.net/donate.html
> Message delivered to [hidden email]

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