Hum issue - driving me more crazy

Mribob, Purchase a Iso-Max VRD-1FF made by Jensen Transformers Inc.

Ozzy,

I don't think the Iso-Max VRD-1FF will work on a SAT dish
system.

Yea, I think that Sat systems run DC power through the cable along with the signal. Any transformer in the path would block the DC and my saturate the core due to the DC, making it act like a short circuit.

...I've checked and made sure the dish is grounded properly;
05-31-11: Mribob

Mribob,

Properly.... Please explain.
jim

Jea; I had electrician come out to house and attach dedicated ground wire to a grounded piece of metal on house; ie; electrical conduit. I did try to put a piece of steel rod in the ground to a depth of 5', and attach copper grounding wire; but that proved a bit problematic. What ideas do you have about properly grounding a sat dish? how come my bedroom sat system has no ground hum; only my more sensitive main listening area when I switched out my Meridian 861 processor for a Marantz 7005 processor;(no hum before with same sat box and connections) and added a VAC tubed preamp. System stone quite in 2 channel listening mode; only hums when Marantz is powered up; and attached to Directv dish; take away the hdmi cable from sat dish to marantz; no hum...hummmm; any help would be appreciated. Added a ARTcessary DTI (dual transformed isolator) running as rca plugs instead of balanced to connect Marantz to VAC for front channel for home theater rig; and made a big reduction in the hum; so at least is only mildly anoying, but not eliminated.bought from MCM electronics catelogue...
I would appreciate any and all helpful tips on this problem...sure others have similiar issues with Directv dishes; since the Jensen product works by eliminating the hum; but if fails to allow the video/audio signals to be sent thru as well....