Place ferrite donuts on every cable at the router. Wind several turns of
the CAT cable and power cable through a donut to form a common mode choke.
Requires one on each cable which makes a clump of inconvenience behind the
router/switch.
As a benefit, in trying to resolve some data issues when using the Omni VII
via the internet, the addition of common mode chokes helped that too both
with the reliability of the Omni VII internet connection and reduced the
noise coming from the router/switch.
73
Bob, K4TAX
----- Original Message -----
From: "wade staggs" <tvman1954@gmail.com>
To: "Discussion of Ten-Tec Equipment" <tentec@contesting.com>
Sent: Saturday, September 08, 2012 10:25 PM
Subject: Re: [TenTec] TenTec Digest, Switching Supplies
*Jameco ?? Haven't thought about them in years. I do remember the other
Radio Stores. Most of which were bought out by Tandy Corp. Has anyone
found
a work around for the Hash from Routers? *
On Sat, Sep 8, 2012 at 9:51 PM, Don Allen <w9cw@yahoo.com> wrote:
Most of the older style Linksys routers, such as the WRT54G and WRT54GL
were, and still are, notorious for creating hash... not only their switch
mode wall warts, but the Ethernet outputs did not include any RF
bypassing.
Thus, the Ethernet cables connected to the router acted like long
antennas
propagating the hash everywhere. Although you can find linear wall warts
at most suppliers, I've found the most reliable source for linear wall
warts is Jameco Electronics - a company that I was surprised was still in
business. Years ago, you used to see Jameco ads everywhere.
73
Don W9CW
On 9/8/2012 3:30 PM, N4be_Jim wrote:
Sorry to drag this out but its a problem. Noise generated by switching
supplies... I used the TenTec switcher that came with the Orion and it
was
clean. The build in switcher in my Icom 775 is also very clean. They
are
good design. But go buy a network router or switch, or have a cable
box
installed in your house, or even in your neighbors house, and you may
get a
lot of noise across the HF spectrum, with strong warbly carriers at
regular
intervals. The switching supplies are basically an oscillator that
drives
the power devices to produce the output voltage. Harmonics of that
oscillator cover the spectrum. Wall warts are terrible sources, such
as
those used to power routers or cable boxes. I had to replace the wall
wart
on my router with a traditional DC supply to clean up one problem, but
there are many other oriental wall warts elsewhere in the house, all
creating hash. I have HF mobile and I can cruise the neighborhood and
hear
them as strong signals everywhere.
Nuff said. 73 Jim N4BE
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