Topband: (no subject)

[Jim Jarvis]

Alan Downing G3ZES, wrote:

Hello gents
Just checked the tower.
140Ft shunt fed tower free standing. Shunt fitted at 30ft.
tapping point suggested by Earl.

single wire shunt.

1800 =    1- 1.2
1825 =    1 -1.2
1850 =    1 - 1.1
1875 =    1 - 1.0 
1900 =    1 - 1.0
1925 =    1 - 1.11
1950 =    1 - 1.12
1975 =    1 - 1.2
2000 =    1 - 1.4   

15 more radials fitted last weekend.
Did not need re tuning.
seems to work

Alan, Topbanders:
I don't recall the size of the tower, or the pre-existing
ground system.  However, I would have expected to see the
vswr curve tighten up a bit, if those 15 radials were a
significant percentage increase.  This seems overly broad, 
to the point where I wonder if  it's swamped out by the Rgnd 
losses.  Am I missing something?

n2ea
jimjarvis at ieee.org