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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