Date: Thu, 11 Mar 99 19:56:04 +0000
Message-ID: <26498@yo2kjo.ampr.org>
From: yo2is@yo2kjo.ampr.org
To: rsgb_lf_group@blacksheep.org
Subject: LF: Ground systems ?...
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From: YO2IS
 Hello, am still awaiting the raise of activity in my neighbourhoud, got
receiving reports on my signal but not yet two way contacts. Always a lot
of questions remain unaswered, it seems that everyone is solving the VLF in
his own manner, its similar to things hapen in the EME community from where
the TMO reporting system is comming !. With my actual HM equipment and PC
the QRS type communication is still far way from me.
 Have lately seen very incouraging info's regarding VLF antennas built on
small surfaces, there was no mention about the ground systems. Was reading
in a very old book about VLF antennas and the Braun's grounding praxis.
To day have read a message from IK5ZPV describing his impresive ground sys.
Do use myself the "ground" ofered by the urban heating network, sure its
may be OK but not ideal, the RF curent measured in aerial and in the ground
wire are more or less the same. Our backyard is only 12 x 8 m, good soil
conductivity, will a small ground system improve the antenna eficiency over
the actual "ground" ?.
 Would like to know, just for comparaison, what's the antenna curent for
a VLF tx claimed for 25W output ? (about 75W input, class B).
 Thanks in advance for informations, 73 & DX, Szigy.