[TenTec] TenTec Digest, Switching Supplies

[wade staggs]

*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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