[Elecraft] Help with noise on 40m

[Dave Van Wallaghen]

Hi Zac,

Yeah, the sound files you put up sounded just like the noise I hear from my
TV. In fact, just yesterday, I was operating portable outside and my wife
had the TV on and I could still pick up some of that noise at over 100 feet
away with a 66' doublet hung up I a tree. I have it fed with open feedline
and no power to the rig except for a battery.

At first I thought it may have been radiated through my power lines. I added
a separate power feed and filter in my shack and it was still there. I then
realized this summer while operating portable that it is radiating in the
air. Not sure what is radiating.

If anyone has tackled this with any success (other than getting rid of the
TV), I too would appreciate the advice. I will take Phil's advice and try to
contact Panasonic - although I have my doubts that anything would come of it
- you never know though. I knew plasma's were noisy when I bought it, but it
would be nice to knock some of it down.

73,
Dave W8FGU

> -----Original Message-----
> From: Zac Brown [mailto:zac_brown at mac.com]
> Sent: Saturday, September 08, 2007 3:23 PM
> To: w3fpr at bigfoot.com
> Cc: Dave Van Wallaghen; 'Elecraft reflector'
> Subject: Re: [Elecraft] Help with noise on 40m
> 
> After shutting off all the various circuits in my home, I discovered that
> the noise is actually coming from the TV in our living room.
> The existing dimmer switches are made by Lutron, and are not making much
> noise after all.
> 
> Whenever I plug something into one of the TV's inputs (cable, composite,
> svideo, etc ... ), the noise appears.  I tried adding a bunch of snap-on
> ferrite chokes on each of the input wires, but this didn't help.
> 
> This leads me to think that the TV itself is making the noise (and is
> radiating it via some other means, not the input wire) whenever it sees an
> input signal.
> 
> The TV is a Hitachi 32 inch, model 32UX59B.  Any ideas?
> 
> Thanks,
> 
> Zac
> KD5IEF
> 
> 
> On Friday, September 07, 2007, at 03:17PM, "Don Wilhelm"
> <w3fpr at embarqmail.com> wrote:
> >Zac,
> >
> >The dimmer switches can be 'fixed' - remove them, place on a solid
> >surface and swing at them full force with a hammer :-) .  Replacement
> >with regular light switches will cure their noise.  If the CF advocates
> >have their way, you will have to get rid of them anyway, the CF lamps
> >that I have encountered do not work with dimmers.
> >
> >Seriously, I do believe replacement of those particular dimmers is in
> >order.  I have three in the house that do not make apparent RF noise
> >(but then the antennas are 100 feet away too, which helps).  The ones I
> >have use a slider next to the switch, so they can be turned completely
> >off.  In the past, I have had trouble with ones which have only a slider
> >or knob for both the 'OFF' position and the adjustment - they never turn
> >completely off.
> >
> >73,
> >Don W3FPR
> >
> >Zac Brown wrote:
> >> After shutting off the circuits in my house, it appears that most of
> the noise is coming from two dimmer switches and a switching power supply.
> >> The dimmer switches are for lighting and I'm not sure what the power
> supply is for.  It's plugged into an outlet in my closet and is screwed to
> the wall.
> >>
> >
> >