[Elecraft] OT - USB Hub Noise Issue

[John C. Westmoreland, P.E.]

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 <w4jbb at charter.net> 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
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