HI guys I'm having a huge problem with this AC voltage I'm getting through the coaxial cable coming from my DTV Antenna.
Everything started when I was going to plug my USB external hd to my computer, and I saw some little sparks on the metal shield of the connector. Then I was driving myself mad trying to figure out what's going wrong, I thought It must be the phases on my home circuit could be swapped or something like that like inverted fase or neutral.
Till I used a tool like a screwdriver to check for AC voltage, I touched the metal shield of the male USB connector from my hard disk with one hand and with the other one I touched the female shield or the chasis of my pc case and the it lighted up. So there was AC voltage then I measured it with a digital tester and there was 0.4 volts AC. So then I disconnected the Coaxial cable from my DTV receiver and this AC voltage was gone.
Odd thing is that if I make the same test touching the male usb conector with the tool to measure AC voltage and with the other hand I touch the metallic border of my window I get ac voltage as well. So I was thinking on doing an RF AC ISOLATOR ( do any of you have a simple circuit so I can do it myself I did ones with only caps about 10nf but I cannot see some channels I think cause it's filtering some frequencies) to place in the coaxial cable going to my DTV receiver but how the hell is AC voltage coming from the antenna if the antenna has no voltage feeding it. Hope you guys can help me on this cause I don't know what to do.
I don't have a ground cable connection to connect my devices.. so all I got left is the way they are.
Everything started when I was going to plug my USB external hd to my computer, and I saw some little sparks on the metal shield of the connector. Then I was driving myself mad trying to figure out what's going wrong, I thought It must be the phases on my home circuit could be swapped or something like that like inverted fase or neutral.
Till I used a tool like a screwdriver to check for AC voltage, I touched the metal shield of the male USB connector from my hard disk with one hand and with the other one I touched the female shield or the chasis of my pc case and the it lighted up. So there was AC voltage then I measured it with a digital tester and there was 0.4 volts AC. So then I disconnected the Coaxial cable from my DTV receiver and this AC voltage was gone.
Odd thing is that if I make the same test touching the male usb conector with the tool to measure AC voltage and with the other hand I touch the metallic border of my window I get ac voltage as well. So I was thinking on doing an RF AC ISOLATOR ( do any of you have a simple circuit so I can do it myself I did ones with only caps about 10nf but I cannot see some channels I think cause it's filtering some frequencies) to place in the coaxial cable going to my DTV receiver but how the hell is AC voltage coming from the antenna if the antenna has no voltage feeding it. Hope you guys can help me on this cause I don't know what to do.
I don't have a ground cable connection to connect my devices.. so all I got left is the way they are.