[TenTec] TenTec Digest, Switching Supplies

[Bob McGraw - K4TAX]

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 at gmail.com>
To: "Discussion of Ten-Tec Equipment" <tentec at 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 at 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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>>
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