[Antennas] Question about deedline length and how it might..

Sun, 7 Apr 2002 21:30:14 -0400

affect RFI. I am using the same antenna that is called a German quad that
consist of 236 feet of wire laid flat to the ground and feed in a corner
with a 28 foot matching stub of 450 ohm ladder line to coax and in to my
shack and connected to a Drake MN2700 tuner. I use to be able to tune this
antenna on 10 through 20 meters with no problem and no RFI. It is resonant
across the entire 40/75/80 meter band and I have no RFI when using
there...even when running full legal limit. However no it is almost useless
on 10-20 meters because of the RFI. Especially on bands like 10-17 and 15
meters. The only thing I changed was remove some old 9913 with the hollow
air dielectric and replace it with some LMR400 and I took about 20' off what
was about an 80-90' run. Is it possible since nothing else changed...that
the shorter length of coax is causing this problem???? It is only about 60'
now. I would be interested in any and all helpful feedback. 73, Steve, NX1G