[ICOM] Help with Severe Electrical Noise

[Lee Mairs (SAG)]

Michael -
I had the same problem earlier this week.  It turned out to be a 
Wallwart power supply for a 7port USB hub.  A Navy MARS friend and I 
finally found it after about 45 minutes turning everything on and off 
in the house.  While we stood in the shack congratulating ourselves, 
my buddy noticed the s-meter swing upward and the noise was back. 
Tracked it first to a UPS and then to a similar Wallwart powering yet 
another 7 port USB hub identical to the first one.

Beware the Wallwarts!  Especially on a 7 port USB hub with all sorts 
of blinking LEDS that you get off Ebay for about $10!

73 de Lee
KM4YY/8



michael morgan wrote:
> I am sorry this is not directly related to Icom radios except the usage of
> them.  I have an Icom 756Pro II that I am using with a Gap Challanger
> antenna.  Also has been well for the last few years.  For some reason about
> three days ago and started getting a s9 or higher "White Noise" on all
> bands.  It is over powering all but the strongest of signals.  The is
> happening on all bands.  I have tracked it down to something electrical
> around my desk.  I did this by the following means. If I power the radio
> from a 12V marine battery and kill the breaker to  my Shack area the noise
> diminishes.  If I power the breaker back on the noise returns.  I tried to
> unplug everything with the breaker on and I get the noise.  I am stumped.
> It is there if I power from a battery or my 12V power supply.  I
> disconnected everything from the rig exept power and antenna and it is
> there.  Any help would be greatly appreciated.  Also this is occuring on my
> other rigs as well which are a Icom 706MKIIG and a Kenwood ts450s.
> 
> 
> Thanks in advance
> 
> Michael, AA5SH
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