Interference
 

On Sat, 22 Oct 2005 19:46:51 -0400, "E.F." wrote:

What are some of the interferences out there that mess up SW?? It seems
that everytime I have my laptop on it get a high pitch tone.

EF

The inverter that powers the backlight on the display is the likely
culprit. It is kind of like the Horizontal output on a TV, nice saw
tooth wave with harmonics that reach well into the HF spectrum.

Just about every other clock inside the computer runs at frequencies
well above HF.

Interference
 

"m II" wrote in message
news:SYD6f.27604$y_1.23956@edtnps89...
Brad wrote:

The what? I'm sorry, but you've lost me. This neighbour is in her late
50's , early 60's perhaps.

Brad.


Well, when your post started with:

"Now, I'm going to do a Cuhulin mindless ramble here......."

I automatically assumed you'd been keeping up on his voyeuristic exploits.
The ages 37 and 30 are those of his new female neighbours, who Cuhulin
seems to be monitoring twenty four hours a day. He knows their every move
and posts them here..in a mindless and rambling way, of course..


mike

Oh I see. Sorry. Now I'm with you. About three weeks ago I put Cuhulin into
my message rules - delete. The mindless drivel messages from him stopped
instantly and the number of posts that I have to download into my newsreader
dropped by about 50%. I have no interest in the tripe posted by the bored
old perverted hick.

Brad.

Interference
 

On Sun, 23 Oct 2005 12:03:27 +1000, "Brad" bradvk2qq AT w6ir.com
wrote:



"David" wrote in message
.. .
On Sun, 23 Oct 2005 10:58:26 +1000, "Brad" bradvk2qq AT w6ir.com
Any digital clock radio
Fluorescent lighting
actually, the list is endless.

Brad.
Re-e-e-e-a-lly...

What frequency is that fluorescent lighting on?

can you say Hash? Particularly those little compact beasties.

Bad.


A magnetic ballast lamp puts out hash. A modern compact fluorescent
operates very quietly except for one discreet band where there is some
potential for interference. Not nearly as much of a problem as light
dimmers at the neighbors.

Interference
 

On Sat, 22 Oct 2005 21:57:43 -0700, matt weber
wrote:

On Sat, 22 Oct 2005 19:46:51 -0400, "E.F." wrote:

What are some of the interferences out there that mess up SW?? It seems
that everytime I have my laptop on it get a high pitch tone.

EF

The inverter that powers the backlight on the display is the likely
culprit. It is kind of like the Horizontal output on a TV, nice saw
tooth wave with harmonics that reach well into the HF spectrum.

Just about every other clock inside the computer runs at frequencies
well above HF.
The vertical waveform in the TV is the one that causes all the
buzzing.