[Premium-Rx] interference caused by tv sets

[NewRadioChap at aol.com]

RFI  - what a can of worms - spent most of my life hunting it down...

Much of the interference is radiated through the CRT glass too - so ferrite 
beads will not necessarily be the solution. The plastic cases are frequently 
sprayed internally with RF screening paint. Some flat screens have the same 
problem.
A common fix (or at least an attenuator) is to fit very fine metal mesh (so 
fine you can still see through it). This is also done to meet strict military 
TEMPEST qualification for very low RF radiation. It is quite common to see it 
on older HP CRT equipment (sometimes mistaken for anti-glare coating), which 
was built to military standards way back then.
Some TVs and monitors will still radiate RF noise when switched off - as they 
are not actually off - just 'sleeping' - some of the logic (and PSU) is still 
very active.

Another serious source of interference is high-efficiency lamps. I have 
reduced the RF noise from these using ferrite beads on the cable, and fine 
chicken wire around the glass - which is connected to mains earth.

Don't use the mains earth for your radio - make a another somewhere - it will 
definitely be 'cleaner'.

If I'm hunting serious DX - everything in the world is switched off, except 
my radios and a battery powered incandescent lamp.

Best regards...    :-)
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