If you have any fluorescent lights in the house, turn them off. Take a
small radio on AM and walk around to find the source.
Much of your noise is probably the PS of the PC. I use to get that when
I used the regular $20 PS's Go to Comp USA and get a good high end
supply, the cabling is shielded and they are designed for low RFI. The
cost is a bit higher, $150-500 but it's worth it if you have computers
near radios. I have 4 computers running in the radio room on 4 UPS's
NO NOISE to the radios at all.
Good Luck!
73 Chris, VE3NGW/W4 Florida

Robert Kubichek wrote:

To cut down on PC noise, use a metal case with no plastic inserts.
Use ferrite beads/chokes on all cables coming out of case, and if
possible, put a metal plate between PC and radios, I have a metal
layer under my desktop/workbench that is grounded, with the radios
above, and Pc's below, with a LCD monitor connected to each pc through
a KVM switch, with very little if no noise from pc!!!

Bob N9LVU

Ken Bessler wrote:

"Dale Parfitt" wrote in message
news:JdVse.4796$kj5.3590@trnddc03...


As for noise floor- take Pete's suggestion or take your K2 to your
friends
house and compare signals there.

It is likely the noise comes from your house- switching power
supplies in
consumer electronics, fan speed controls, dimmers, microwave ovens etc.

Put the K2 on battery power and turn offf the main breaker into the
house.

Dale W4OP




I did that today - WOW! What a difference! Unplugging my PC and
turning off the SEC 1223 ps (leaving the K2 on SLA cells automatically)
made a HUGE difference! The PC was causing 90% of the noise.

My noise floor went from S7 to S4 and new stations just jumped
out of the air.

My friend still hears less band noise than me but only by 1-1.5db at
the most now.

Now, how do I solve the PC noise problem? I guess I could spend
a small fortune in ferrite snap on chokes but I doubt I would be able
to equal how quiet it is with the PC off. If that's so, I doubt I'll
bother
- it's just too easy to turn off the PC during net time......

Would a laptop on batteries work without noise?

--
Just my 2¢... 73 es gd dx de Ken KGØWX
Grid EM17ip, Flying Pigs #-1055
Proud builder & owner of Elecraft K2 #4913