Hi All
Just finished reworking the radial frame and feedpoint connection for my
1/4 wl elevated radial vertical.
The VSWR profile doesn't seem right to me. It feels too flat and
probably is indicative of something wrong.
Am hoping for wisdom from the group.
The vertical is built from Rohn 25 with a top "stinger". At 25 feet
three Rohn insulators separate 13 additional sections plus stinger.
Stinger's length set for resonance at 1.820. There are 24 elevated
radials with sort of irregular spacing, each tied to the angle iron
frame which stands off via insulators. The vertical is fed at the 25
foot level just above the insulators through a 1:1 current balun with
RG-213/U. I walked each radial with a current probe and cut each at the
zero current point at 1.820. After cutting each radial to length, I did
not take another walk around to see if anything changed.
The VSWR profile is:
1.800 1.0 : 1
1.825 1,0
1.850 1.0
1.875 1.0
1.900 1.1
1.925 1.3
1.950 1.4
...
Looking forward to your constructive comments and thanking you all in
advance.
73, Alan KF3B
_______________________________________________
Topband mailing list
Topband@contesting.com
http://lists.contesting.com/mailman/listinfo/topband
|