Hi Dave,
> If you haven't installed a LOW PASS filter on your radio
> equipment, now is
> the time to do so. .
You may have missed this, but he operates six meters and has
channel two RFI. Short of a helical resonantor or cavity or
other very loosely coupled very high Q filters, there isn't
anything that will stop channel 2 spurious from a six meter
rig.
>Also, you need to investigate your station ground system
Station grounds are great for lightning and safety.
If a station ground fixes or seriously changes RFI, you have
a serious antenna system or equipment issue. With a good
antenna system having low levels of common mode on the
feeder and good connector integrity in equipment.... an RF
ground does nothing at all. It would be much better to
figure out why the equipment needs an RF ground and fix that
problem than to band-aid the system with patches.
One common misconception is filters have to route unwanted
RF to ground. That isn't how they work. What they really do
is block harmonics by adding a series of high impedance
series components and low impedance shunt components to the
line. While harmonics are reflected back to the source, they
remian INSIDE the coaxial line. Anything you do on the
outside of the coax has no effect, unless you have a bad
shield connection someplace. Better to fix the shield
connection than band-aid the problem with grounds.
Checking the coax is excellent advice.
73 Tom
_______________________________________________
RFI mailing list
RFI@contesting.com
http://lists.contesting.com/mailman/listinfo/rfi
|