[TenTec] Orion

[Lee Crocker]

My guess is that you need an artificial ground.  If
the rig is playing RF free with the vertical but has
RF with the G5RV, you have common mode RF comming back
on the G5RV feedline.  An alternative might be to
change the G5RV into an openwire center fed antenna
and use a balanced tuner design like the single coil Z
match or the johnson matchbox.  Another alternative
might be to take the G5RV feedline all the way down to
the ground to a barrell connector attached to a ground
rod and a few radials.  Then take another peice of
coax back up to the shack.  Use a ferrite choke on the
coax going back up to the shack.  Seems like a lot of
hassle but it gives the common mode current a way to
get to ground without going through your mic.  Check
out the RFI forum on contesting.com.  My experience
tells me that a good balanced antenna and antenna
tuner is the way to go.    

http://www.remeeus.nl/english/hamradio/artificial_ground.htm

http://lists.contesting.com/archives/html/RFI/2000-08/msg00015.html

http://home.att.net/~w4cwg/artgnd.htm

http://www.eham.net/reviews/detail/2118

http://www4.tpgi.com.au/users/ldbutler/SingleCoilZMatch.htm

73 W9OY


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