[Elecraft] Help with noise on 40m

[Zac Brown]

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.
>>
>
>