[TowerTalk] Radial systems

[Michael Tope]

Scott,

I have been thinking about your problem a little,
but still not sure that I have a definitive answer.
In either case, you are going to have RF current
induced in the adjacent antenna (both in the
radiating element, and in the ground system), but
its not clear to me which case will produce
the greatest coupling. Its also possible that the
coupling between the transmit antenna, and the
adjacent antenna's radiating element will more
than swamp out any coupling between the TX
antenna and the adjacent radial system - but
I can't say for sure without doing some analysis.

If I were you, I would go ahead and hook the
system's together, and then work out any cross-talk
problems as they come-up with a combination
of common mode-chokes (ferrite beads), and
1/4 wave stubs. In the worst case, you can always
cut the umbilical chord between the two systems
with a good pair of wire cutters.

Good luck+ACE-

73 de Mike, W4EF.........

----- Original Message -----
From: Scott Detloff K8DX +ADw-ni8l+AEA-raex.com+AD4-
To: +ADw-towertalk+AEA-contesting.com+AD4-
Sent: Friday, March 31, 2000 11:02 AM
Subject: +AFs-TowerTalk+AF0- Radial systems


+AD4-
+AD4- This spring, once the last of brush is cleared out from the storm that
took
+AD4- down the tower is gone, I'm going to start laying radials.  The plan is
+AD4- about
+AD4- 50,000' for the 80M 4 square, and another 30-40,000' for a 160M vertical.
+AD4- Since the antennas will be fairly close to each other, does it make sense
to
+AD4- tie the radials of both systems together?  In the fall I will be doing
SO2R,
+AD4- so  I don't want to cause any 80/ 160   problems.  I  worry that the added
+AD4- radial system won't be worth it if its going to cause headaches with the
+AD4- adjacent band.
+AD4-
+AD4- What's your opinion?
+AD4-
+AD4- Scott K8DX
+AD4-
+AD4-
+AD4-
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