[Elecraft] RX IQ USB Noise

[Clay Autery]

You are NOT grasping the problem or the suggested solution.

Please do yourself a favor and go read K9YC's white papers on
bonding/grounding, noise reduction, EMI/RFI reduction, etc....

Just do it...

______________________
Clay Autery, KY5G
MONTAC Enterprises
(318) 518-1389

On 8/31/2016 2:23 PM, Enzo Adrian-Reyes wrote:
> This would be hard but I can see how that could happen.
> The KX3 and the laptop use 2 prong connectors and this still happens, the
> macbook pro has a grounded power plug
> but this still happens.
>
> The stupid thing is they all share the same power board, so in theory they
> should all be sharing the same green wire.
>
> However
>
> The KX3 chassis is connected to a ground system independent than the
> electrical ground, the same way I thought hams connected their radio
> equipment to ground (through a ground rod). The problem I have is that I
> live near KVA power lines, and they induce a current on the shield of the
> coax, which if I dont ground the KX3 causes electrical build it which I can
> sense with my finger.
>
> So given what you have said the ground of the KX3 chassis is connected to
> the ground system for the radio, and this is causing the loop.
> However this means I cannot do what you suggest, as the ground in all the
> plugged elements is already connected to the green wire, except the KX3
> whose power supply is a double isolated, except the chassis which is
> connected to the radio ground.
>
> I do not know how to solve this, my only work around for this would be to
> try to isolate the incoming current with arrestors at the entrance of the
> shack, but that might not get rid of this current.
>
> Regards
>
>
> On Thu, Sep 1, 2016 at 3:06 AM, Jim Brown <jim at audiosystemsgroup.com> wrote:
>
>> Loop is absolutely the wrong way to view this problem, and transformers
>> are NOT the easiest or cheapest solution.
>>
>> The solution is 1) proper chassis-to-chassis BONDING between all of the
>> equipment being interconnected and 2) get power for all of the
>> interconnected equipment from the same mains outlet, or from outlets that
>> share the same "green wire" (what is called the "protective earth" in
>> Europe).
>>
>> 73, Jim K9YC
>>