[RFI] UVerse WAP VEN501-AT Interference

Gary K9GS garyk9gs at wi.rr.com
Tue Jan 26 22:35:20 EST 2016

A really good source for replacement linear wall supplies is your local 
Goodwill store.  They usually have boxes of them for next to nothing.  
An easy solutions for times when there is not a hamfest coming up.

Just be sure you get a linear one like Jim mentions.  A good way to tell 
is by size/weight (the linear ones are usually heavier) for the same 
current rating and if it is dual-voltage input (without a switch) is is 
likely a switching supply.

On 1/26/2016 8:26 PM, Jim Brown wrote:
> On Tue,1/26/2016 6:07 PM, Clark Macaulay wrote:
>> They appear to
>> be like spurs.  On 20m, the spacing was about 14000 Mhz, 14030, 140060,
>> 14090. There is something similar on the higher bands.
> It's quite common for RF trash to be radiated from CAT5 cables 
> carrying Ethernet signals (and even from wiring inside the box). 
> Radiation from Ethernet cables can be effectively suppressed by 
> winding 5 turns of the Ethernet cable through a toroid or clamp-on of 
> #31 or #43 Fair-Rite ferrite material. Likewise, other cables 
> connected to the router, including the power supply cable may need to 
> be choked.
> This sort of trash is also typical of switch-mode power supplies, and 
> it's quite likely that the one supplied by UVerse is one of that type. 
> It's always a good move to replace every switching power supply you 
> find with an old-fashioned linear supply having the same voltage 
> rating.  Simply find one of the oldies in your junk box having the 
> same voltage rating, cut the cables for both units, check wiring 
> polarity, and splice the old supply to the connector that mates with 
> the new unit.
> None of this, of course, will kill RF that is radiated by a wiring 
> within a box that is poorly built or poorly shielded.
> 73, Jim K9YC
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> 73,
> Gary K9GS
> Greater Milwaukee DX Association: http://www.gmdxa.org
> Society of Midwest Contesters: http://www.w9smc.com
> CW Ops #1032   http://www.cwops.org
> ************************************************

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