Interference Question
 

I have narrowed down interference to definitely being a computer. I turned
off everything electronic in the house, and still get a lot of
intereference. I am guessing it is coming by way of the power lines into the
house. I even disconnected the antenna and was using only the coax
connecting the antenna to the receiver, and still got interference. It does
not happen only on one frequency but all up and down the bands, becoming
more noticeable at 13 Mhz through about 15 Mhz regions.

So, I am wondering, which would likely be the most plausible source:

Television cable
Wireless network
Home computer network through house wiring

The next door neighbors do not have a computer. They recently bought a
combination telephone-alarm clock-radio (am/fm) device, but doubt that is
the source. There are other apartments near me.

Would a filter help - low pass or high pass ? I looked at MFJ, but they want
$100 a piece for what they offer.

THANKS


I got cute teeth & claws meow

From your description, a filter cannot help. A directional antenna might,
e.g., a loop. Ideally, you need to find the source and fix it there. A
portable radio and loop would help you sniff it out.

Good luck,

Tom

"Warpcore" wrote in message
ink.net...
[snip]
not happen only on one frequency but all up and down the bands, becoming
more noticeable at 13 Mhz through about 15 Mhz regions.
[snip]
Would a filter help - low pass or high pass ? I looked at MFJ, but they
want
$100 a piece for what they offer.

If the computer is a ATX variety, remember the power supply does NOT sleep
when the system is off! rather the motherboard does...pull the AC cord off
the back of ALL computing equipment and then check for noise. Also check all
"Compact Flouresent" fixtures as these damn buggers ARE noisy. Last but not
least.....lamp dimmers, even if the lamp is OFF!!! yep, noisy even when the
lamp is dark. Some are actually quieter when the lamp is on full
bright!...Happy hunting......Eddie

"Warpcore" wrote in message
ink.net...
I have narrowed down interference to definitely being a computer. I turned
off everything electronic in the house, and still get a lot of
intereference. I am guessing it is coming by way of the power lines into
the
house. I even disconnected the antenna and was using only the coax
connecting the antenna to the receiver, and still got interference. It
does
not happen only on one frequency but all up and down the bands, becoming
more noticeable at 13 Mhz through about 15 Mhz regions.

So, I am wondering, which would likely be the most plausible source:

Television cable
Wireless network
Home computer network through house wiring

The next door neighbors do not have a computer. They recently bought a
combination telephone-alarm clock-radio (am/fm) device, but doubt that is
the source. There are other apartments near me.

Would a filter help - low pass or high pass ? I looked at MFJ, but they
want
$100 a piece for what they offer.

THANKS


I got cute teeth & claws meow

Warpcore schrieb:

I have narrowed down interference to definitely being a computer. I turned
off everything electronic in the house, and still get a lot of
intereference. I am guessing it is coming by way of the power lines into the
house. I even disconnected the antenna and was using only the coax
connecting the antenna to the receiver, and still got interference. It does
not happen only on one frequency but all up and down the bands, becoming
more noticeable at 13 Mhz through about 15 Mhz regions.

So, I am wondering, which would likely be the most plausible source:

Television cable
Wireless network
Home computer network through house wiring

You are using PLC and are still wondering where interference comes from?
I bet it's point #3.

Stephan
--
Home: http://stephan.win31.de/ | Webm.: http://www.i24.com/
PC#6: i440LX, 2xCel300A, 448 MB, 18 GB, ATI AGP 32 MB, 110W
This is a SCSI-inside, Legacy-plus, TCPA-free computer :)
Reply to newsgroup only.

Do not know what PLC is, but if you infer I am using a home networking
system in the house, nope S ! Someplace else in the neighborhood they are
using one though I'd bet G. Maybe I need to create an EMP and see if it's
still there HA HA (anybody got shematics LOL ?)

Warpcore schrieb:

Do not know what PLC is,

PowerLine Communications.

but if you infer I am using a home networking
system in the house, nope S !

Just thought so because you mentioned the point. Sources of
interference, hmm. My Fast Ethernet switch radiates like hell, louder
than any of my PCs. ISDN generates a very discrete noise spectrum, that
can't be it in your case. Look for anything with a switching power
supply, these things can be very noisy. TVs also are ideal noise
sources, particularly when their noise creeps into the house wiring. But
even with everything turned off, I've still noticed non-negligible
radiation from the house wiring, and I have no idea where that comes
from. I hope moving into a new house will fix that... ;)

Stephan
--
Home: http://stephan.win31.de/ | Webm.: http://www.i24.com/
PC#6: i440LX, 2xCel300A, 448 MB, 18 GB, ATI AGP 32 MB, 110W
This is a SCSI-inside, Legacy-plus, TCPA-free computer :)
Reply to newsgroup only.