[Elecraft] K3: 30M signal

[Fred Jensen]

Jim Brown wrote:

> Ethernet terminals (computers, routers, switches, hubs) are well 
> known to generate interfering carriers on 30M, 20M, 15M, 10M, and 
> 6M. The clocks are local to each system, so if you have neighbors, 
> it's common to hear a cluster of them around 14,029, 21,052, and 
> the low end of both 10M CW and 6M.

I host the wireless company's RAP on my tower and power it in exchange 
for free HS Internet.  It has two transceivers ... one for the backbone 
[flat panel directional antenna, and an omni stick for all the 
neighbors.  It is about 2m below my beam, and I hear a close spaced pair 
of signals on all the frequencies Jim mentioned.  They are very weak and 
only audible on my K2 and K3.  They're in the noise on my TS-850 and 
FT-847.  The Cat5 cable comes down the messenger cable along with my 
coax runs.

Strangely, 1KW into the beam or my low band antenna, the apex of which 
is about 2m from the RAP, on any band, has no effect on the wireless.

73,

Fred K6DGW
- Northern California Contest Club
- CU in the 2009 Cal QSO Party  3-4 Oct 2009
- www.cqp.org