[hpsdr] Ozy with Gb Ethernet

[Donald Kay]

Hi Fred,
It was very bad here. The original setup had a couple of
65 ft runs of cat 5e, one to the front of my house and
one to the rear where the shack is. The network equipment
was all linksys so maybe that had something to do with it.
Also, although I have some 100BT here it was mostly older
10BT stuff. I have seen speculation on the web that these
are harmonics of the frame rate but I don't know that for
sure.

The interfering signal shows up every 30 khz but every other
one is quite strong. I saw it from about 80 meters through
all the HF bands.

Moving to a wireless network solved the problem.

73 Don KI6FOM

Fred Brandeberry wrote:

> Don,
> 
>      Gee, I don't see that, and I have 100BT run all over the place.  
> What frequencies did you see that on?
> My Dipole is right over the house as well. I do see some spurs, but 
> nothing like that strong!
> Puzzled,
> WA8KCW
> Fred
> 
> ----- Original Message ----- From: "Donald Kay" <dbk31415 at cox.net>
> To: "Tony Langdon" <vk3jed at gmail.com>
> Cc: "hpsdr list" <hpsdr at hpsdr.org>
> Sent: Sunday, March 11, 2007 12:38 PM
> Subject: Re: [hpsdr] Ozy with Gb Ethernet
> 
> 
>> ***** High Performance Software Defined Radio Discussion List *****
>>
>> Have you folks considered the RFI aspects of Ethernet? I just
>> finished switching my home lan to 100% wireless due to the
>> awful noise my twisted pair setup was causing (20 over s9
>> signals every 60 Khz). Personally,  don't think 10/100 twisted
>> pair Ethernet belongs anywhere near a sensitive receiver.
>>
>> 73 Don (KI6FOM)
>>
>>
>>
>> Tony Langdon wrote:
>>
>>> ***** High Performance Software Defined Radio Discussion List *****
>>>
>>> At 01:03 PM 3/11/2007, Phil Harman wrote:
>>>
>>>> ***** High Performance Software Defined Radio Discussion List *****
>>>>
>>>>
>>>> HI Warren,
>>>>
>>>> Welcome to the group. Not sure what we would gain my going to T-100
>>>> Ethernet since at  the moment we can get 35-40MB/s over USB2.  The
>>>> uWSDR guys have chosen Ethernet as their means of communicating with
>>>> their hardware mainly so they can mount it at the top of a tower and
>>>> run CAT5 cable to it I think, see
>>>>
>>>> < <http://uwsdr.berlios.de/>http://uwsdr.berlios.de/ >
>>>>
>>>> I think an Ozy type board with GB Ethernet would be just great since
>>>> we could transfer some of the DSP work to the PC and look at MHz of
>>>> bandwidth at a time.
>>>
>>>
>>>
>>> With my shack layout, 100Mbps Ethernet is a better option than USB,
>>> because it means I don't have to cram the PC into a tiny
>>> space.  Worst case is to run a Cat 5 (or 6) cable around the place. :)
>>>
>>> 73 de VK3JED
>>> http://vkradio.com
>>>
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> 
> 


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