[TenTec] Orion II tone at 7030, 14030

Jim Brown k9yc at audiosystemsgroup.com
Mon Sep 18 12:49:24 EDT 2017

The birdies around 14030, 21052, and on the low end of 10M and 6M are 
generated by one of the older protocols running on wired Ethernet 
systems. The RF is conducted onto the cables and radiated by those 
cables. it can be suppressed by ferrite chokes on those cables. If the 
cables are longer than about a quarter wave, chokes are required on both 
ends.  The worst offending hardware can also radiate from its internal 
wiring due to poor shielding and poor circuit layout. The only fix for 
that is my patented bucket treatment.

The clocks that produce these birdies are stable, but their frequency is 
established inside the router or Ethernet switch. If you have neighbors, 
you'll hear your them on frequencies slightly different from yours. 
Identify which one is yours by killing power to your router or Ethernet 
switch to note which one goes away.

Lots of detail on this and how to wind the ferrite chokes in


and http://k9yc.com/KillingReceiveNoise.pdf

73, Jim K9YC

On 9/18/2017 9:27 AM, Joe Papworth via TenTec wrote:
> I hear several around 14030 at my place.
> Wired routers can cause it too.

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