RadioBanter - View Single Post

February 4th 05, 09:18 PM

wrote:

I picked up some ferrite cores today and have been attaching them to
power cords, computer cables and my coaxial feedline. I can report a
definite reduction in noise. This is especially gratifying because
ferrite cores aren't too expensive.

Any advice about how to position these cores? Are they best placed
close to the electrical outlet or close to the computer, receiver or
device being used (or both)? Would appreciate your insights.

Thanks....Steve

The first ones go on each end of your coax so RFI picked up on the shield isn't
radiated to your antenna, or brought back into the radio.

After that, if it's a device you think causes RFI, put them on the end of the
wire just as it comes out from the case first, to kill the RFI before the wire
can act like an antenna.

With things like incandescent lamps, if you're going to use one, put it near the
outlet so any RFI that snuck into your power line from something you didn't
track down yet doesn't get radiated by the power cord.

Think of the power cords as antennas for transmitting RFI. You want to choke it
off as close to the transmitter as possible.

Hope this helps.