[Elecraft] Ether Nets and Interferrence, redux

[tom.w3qs]

Hi Guys,

The CRT will be replaced as soon as my bank balance recovers from Christmas.
I have managed to eliminate all cat5 cables except for the one between the
modem and the wireless router, and I moved that to the farthest point in my
house.  I think I will replace that last one with a shielded one since it
needs to be only a foot long.  A high gain antenna in that corner provides
maximum signal strength throughout the house and a block in every direction
outside.  Good thing you can encrypt your broadcast.

As to the wall warts and power strips, short of buying fat toroids, I just
threw the offenders away.  Oddly, about half the wall warts and half the
power strips were really bad, the rest were OK - couldn't find any
commonality among either the good or the bad.  I built a distribution box
for everything that needed 12 V and power it from my Astron 35.

None of the remaining interferences are really bad.  The interference from
the CRT is mostly just a trashy sound and I can copy through it.  Many of
the remaining hetrodynes are below S2.  Some probably come from the computer
and I'm sure some are from the K2, itself.

Tom 

-----Original Message-----
From: Tom [mailto:tom.koeken at home.nl] 

Hi Tom

2 remarks:
1 If you are still using a CRT-screen for the PC than change it as soon as
possible for a TFT-screen. QRM of a conventional CRT-screen is enormous.

2 Please check on your (remaining) CAT5 cables; for ham-radio use they
should be shielded. They cost a few cents more, but they realy add by
eliminating unwanted radiation.

72/73 HNY Tom PC5D
K2/100 SN 2709


----- Original Message -----
From: "tom.w3qs" <tom.w3qs at verizon.net>

> Good Morning Group,
>
> A lot has been written about interference from Ethernets, and I would like
> to share my latest experiences.

> As of this morning, the 269 hetrodynes was down to 78, with 52 of those
> positively attributable to the CRT monitor.  Of the remaining 26, many are
> probably internal to the K2, being harmonically related.  I'll work on 
> those
> with another receiver later.
>