K3 built in sound card and RF

[Elecraft mailing list]

All:    Recently I sent my k3 into get the sound card and second rcvr put in.  Upon receipt of the unit I plugged it back into the same connectors I had previously used with the exception of the NEW USB cable connection to the CPU/K3/P3. I now have tremendous RF in the shack which was not there before sending in the unit. Any help would be greatly appreciated.

Gerald Muller [hidden email]
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[Bob McGraw - K4TAX]

Probably you will need a good shielded USB cable and may need to add a
clamp on ferrite choke on the cable close to the computer.    I went
through 4 different brands of cables and types of USB cables before I
found one that didn't have issues.   The one I ended up using does have
"shielded" printed on the outside of the wire.

I think you likely had RF in the shack before, but it didn't show up
until the additional communication path was added.

73

Bob, K4TAX


On 11/16/2018 11:22 AM, Jerry Muller via Elecraft wrote:

> All:    Recently I sent my k3 into get the sound card and second rcvr put in.  Upon receipt of the unit I plugged it back into the same connectors I had previously used with the exception of the NEW USB cable connection to the CPU/K3/P3. I now have tremendous RF in the shack which was not there before sending in the unit. Any help would be greatly appreciated.
>
> Gerald Muller [hidden email]
> ______________________________________________________________
> Elecraft mailing list
> Home: http://mailman.qth.net/mailman/listinfo/elecraft
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> Post: mailto:[hidden email]
>
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> Please help support this email list: http://www.qsl.net/donate.html
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[Jim Brown-10]

Exactly what do you mean by RF in the shack?

Most "RF in the shack" problems are caused by failure to do proper
bonding.  These slides for a tutorial talk I've done for ham conventions
and clubs are a good start. Also, study N0AX's recent ARRL book on
Grounding and Bonding, to which I contributed.

http://k9yc.com/GroundingAndAudio.pdf

73, Jim K9YC

On 11/16/2018 9:22 AM, Jerry Muller via Elecraft wrote:
> All:    Recently I sent my k3 into get the sound card and second rcvr put in.  Upon receipt of the unit I plugged it back into the same connectors I had previously used with the exception of the NEW USB cable connection to the CPU/K3/P3. I now have tremendous RF in the shack which was not there before sending in the unit. Any help would be greatly appreciated.


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