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OT - USB Hub Noise Issue

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W4JBB

OT - USB Hub Noise Issue

I have been plagued with noise spikes that show up on my P3 on certain
frequencies and have narrowed it down to a Belkin F4U017 USB hub. The
problem is that my iMac only has four USB ports.

It is definitely the hub and not the wall-wart power supply.

Does anyone use an inexpensive hub with their iMacs that does not
generate any noise?

73,
Joel - W4JBB
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W4JBB

Re: OT - USB Hub Noise Issue

I had a couple of suggestions. Thanks for the input.

73,
Joel - W4JBB

On 11/5/13, 5:09 PM, Joel Black wrote:

> I have been plagued with noise spikes that show up on my P3 on certain
> frequencies and have narrowed it down to a Belkin F4U017 USB hub. The
> problem is that my iMac only has four USB ports.
>
> It is definitely the hub and not the wall-wart power supply.
>
> Does anyone use an inexpensive hub with their iMacs that does not
> generate any noise?
>
> 73,
> Joel - W4JBB
> ______________________________________________________________
> 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
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John Westmoreland

Re: OT - USB Hub Noise Issue

Hello All,

Since this is OT - I had a project in the 'shack' and I measured 48MHz and
480MHz on a spectrum analyzer and I didn't know where it was coming from.
The project had a USB port that was unused - and that is where the noise
was coming from. USB devices, if 'uncontrolled' - can create a lot of
noise and issues when they are in close proximity to radio equipment.

73's,
John
AJ6BC

On Wed, Nov 6, 2013 at 4:57 PM, Joel Black <[hidden email]> wrote:

> I had a couple of suggestions. Thanks for the input.
>
> 73,
> Joel - W4JBB
>
>
> On 11/5/13, 5:09 PM, Joel Black wrote:
>
>> I have been plagued with noise spikes that show up on my P3 on certain
>> frequencies and have narrowed it down to a Belkin F4U017 USB hub. The
>> problem is that my iMac only has four USB ports.
>>
>> It is definitely the hub and not the wall-wart power supply.
>>
>> Does anyone use an inexpensive hub with their iMacs that does not
>> generate any noise?
>>
>> 73,
>> Joel - W4JBB
>> ______________________________________________________________
>> 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
>>
>>
> ______________________________________________________________
> 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
>

Alan Hawrylyshen

Re: OT - USB Hub Noise Issue

In reply to this post by W4JBB

Can you share the recommendations? I have a USB 3 powered hub that I love but it generates terrible interference on 20m. I just realized this after your post.

Thanks
Alan
K2ACK

Sent from my mobile device.

> On Nov 6, 2013, at 16:57, Joel Black <[hidden email]> wrote:
>
> I had a couple of suggestions. Thanks for the input.
>
> 73,
> Joel - W4JBB
>
>> On 11/5/13, 5:09 PM, Joel Black wrote:
>> I have been plagued with noise spikes that show up on my P3 on certain frequencies and have narrowed it down to a Belkin F4U017 USB hub. The problem is that my iMac only has four USB ports.
>>
>> It is definitely the hub and not the wall-wart power supply.
>>
>> Does anyone use an inexpensive hub with their iMacs that does not generate any noise?
>>
>> 73,
>> Joel - W4JBB
>> ______________________________________________________________
>> 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
>
> ______________________________________________________________
> 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