[Elecraft] 14.03 MHz Continuous Tone/Carrier?@#$

[Leigh L. Klotz, Jr.]

Jim,
I know you and I have a different understanding, that he birdies come 
from 100Mb (my belief) and that they come from 10Mb (yours), but I would 
like to straight out a couple of issues, perhaps minor ones.

1. I didn't write the second quoted paragraph below about 6' distance 
from the radio; someone else did, even though your message has my name 
above it.  You are of course correct on this point, but I didn't make 
the point.  (I suspect your RFI-Ham PDF file does say, though, that if 
you have not taken care, your rig's coax and other surrounding objects 
may be part of the antenna and so noise from something in proximity to 
the rig may be an indicator of other problems.)

2. Regardless of whether the birdies come from 100BaseT or 10BaseT, if 
you force your equipment all to the same, your switch will be forced to 
use the same.  And better yet, if you use a hub, forcing one jacked 
piece of equipment to 10MB (or 100MB in your view, doesn't matter for 
this case) is enough to force all to the same.

I've asked a number of ethernet luminaries to explain to me the source 
of the birdies, and gotten blanks.

Leigh/WA5ZNU


Jim Brown wrote:
> On Tue, 14 Aug 2007 15:25:06 -0700, Leigh L Klotz, Jr. wrote:
>
>   
>> Also 21.060.  It is from 100 megabit ethernwt devices.  Switch your 
>> shack to 10 megabit ethernet and it will be only your neighbors QRP 
>> transmitters with end-fed long wire antennas (CAT5 wiring) that you 
>> hear.
>>     
>
> Not that easy. If your 100MBit system is connected to a 10 MBit device 
> (like most Internet modems), it will carry that traffic as 10 MBit 
> traffic, and you'll hear the birdies. 
>
> See my RFI tutorial for more details and fixes. 
>
> http://audiosystemsgroup.com/RFI-Ham.pdf 
>
>   
>> I have two 100 megabit switches within six feet of the radio, and can
>> barely hear the spur on 14.030, so experience varies. 
>>     
>
> No, experience doesn't vary, it has NOTHING to do with proximity to 
> your radio. What matters is proxmity to your ANTENNA, the degree to 
> which that RF trash is suppressed by the router, and the ANTENNAS 
> connected to the router (the Ethernet cables and the power cable)!
>
> 73,
>
> Jim Brown K9YC
>
>
>
>
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