Recently I got a small USB hub to use with this computer.
Several days later I was tuning around 160mtrs and came across a tremendous
noise.
I used a MFJ noise sniffer and ran it down to the hub that uses a small
wart.
It is a rectangle...taller than wide with the wire coming out the bottom.
I took it apart to look it over and found some really poor workmanship and
noticed provision for components that were not installed.
I knew what that meant so I destroyed it and threw it out.
Funny how the noise went away suddenly....hmff
Regards
Dave Harmon
K6XYZ[at]sbcglobal[dot]net
Sperry, Ok.
-----Original Message-----
From: rfi-bounces@contesting.com [mailto:rfi-bounces@contesting.com] On
Behalf Of Martin Ewing
Sent: Tuesday, January 12, 2010 10:08 AM
Cc: RFI List
Subject: Re: [RFI] New switching wallwarts - RFI potential?
Interesting about LF EMC, but no info on the new switching supplies.
I have done no serious tests, but so far have not seen any issues with
the new generation mini-switching wall-warts -- and they are really
proliferating around here.
73 Martin AA6E
On Tue, Jan 12, 2010 at 10:53 AM, Tim Duffy K3LR <k3lr@k3lr.com> wrote:
> Hi Pete!
>
> Here is a great paper on wallwarts.
>
>
http://www.kongsfjord.no/dl/Antennas/Low%20Noise%20Active%20Antennas%20AC-DC
> %20Power%20Supplies%20II.pdf
>
>
> 73,
> Tim K3LR
_______________________________________________
RFI mailing list
RFI@contesting.com
http://lists.contesting.com/mailman/listinfo/rfi
|