Hi all,
I have a problem with audio hum in a satellite TV system that I have
installed at my parent's house. It sounds like 60 cycle hum to me.
Recently I had similar troubles at my own house when I tried to
transfer some cartoons from my laptop to a DVD burner. I managed to
eliminate the hum by plugging my laptop into a three-prong adapter,
thereby eliminating the ground. I have attempted a similar fix at my
folk's place and it didn't help. Here is a rundown of the setup (I
apologize this is so long; I don't want to miss something important):

The setup is basically two separate systems, one at each end of the
house. At one end there are two DBS dishes (receiving our local
channels requires the 2nd dish), a 2:1 switch, an amplified off-air
antenna, a 2:1 splitter, a satellite receiver, a VCR, and a 900 MHz
A/V transmitter.

At the other end of the house there is a 900 MHz receiver, a UHF RF
modulator, and a Ward Signature 25" color TV. This television has a
nice picture, but it has no RCA inputs and it is unable to tune in
channels 2 thru 6, due to an issue with the tuner. This is why I used
the UHF modulator, which I had laying around.

The signal comes into the house, through the receiver, the VCR, the
900 MHz xmitter, the 900 MHz rcvr, the UHF modulator, out to the RF
input on the television. This setup allows my parents to view the
satellite, off-air signals, the VCR, and allows recording of satellite
and off-air programming.

Also important to note: This is a rural property, and the house power
is supplied by a generator.

In my attempts to eliminate the hum I have tried the following:
I have bypassed the house ground by plugging the power strips at both
ends of the house into three-pronged adapters. No luck.

I have disconnected the coax input to the satellite receiver. The
receiver then defaults to an ACQUIRING SIGNAL message. The hum is
still present.

I have tried tuning the UHF modulator to different channels. No luck.

I am at a loss. It seems to me that I have eliminated the possibility
of a ground loop (by bypassing the house ground at both ends). I also
eliminated the possibility of hum induced on the coax (unplugging the
coax input to the receiver).

Please offer advice. Any help would be most welcome!

Joe