On Sunday, January 3, 2016 at 4:56:39 PM UTC-8, Kenny Cargill wrote:
Sounds like a ground loop hum bar, look he
http://www.cinemasource.com/articles/gnd_loop.pdf
Move cables away from each other and don't use cheap co-ax, HDMI etc.
cables.
Kenny
Cinemasource has an RF isolator for which they want $50.
I bought 3 for $25 from these guys.
http://www.rmscommunications.net/pdf/MI2120VPG69&70.pdf
My hum was in the audio from the RF feed. The isolator
cleaned it all up.
G²