[RFI] Keyboard RFI

[Patrick]

Charlie:

I returned a refurbished (guaranteed like new) TV to the store years ago 
because a potential existed between the shield of the tuner input to 
ground.  It would make a visable arc when the braid touched the F connector.

While the TV was connected to cable for the few days I kept it, I could 
hear hash noise on an AM radio as I drove up to the house.

When asked what the problem was with the unit when returned, I replied 
excessive leakage and RF noise.  The counter person said "huh?".  Then I 
said "The TV shocks me".  No more discussion needed.

The CATV coming into your house should have a grounding block tied to 
the house ground.

Now if you are saying the center of the coax to ground has a 50 volt 
potential, count yourself lucky that you still have a working tuner.

Best of Luck!

Pat
wa4tuk




On 8/22/2013 1:03 PM, Charlie Gallo wrote:
> Hi Gang,
> So, got the SW Radio, and have found some interesting RFI sources around the house, have suppressed some, have a tech call in on another (the cable TV line has HORRID noise on it low, and if you lift it off the ground, has about 50volts potential to ground (yes, it'll draw an arc!!!))
>