Eight commercial broadcast transmitters rated at 30 kW PEP 4-26 MHz ar
e being commissioned for plasma formation and heating in H-1. These ma
y be either excited separately or combined into two antennas by a set
of six power combiners. In this paper we describe the various componen
ts of the r.f, power transmission system. We present preliminary resul
ts using this system for plasma formation in argon and hydrogen with m
agnetic fields <2 kG and powers up to 30 kW at 4 and 7 MHz using a sin
gle saddle coil loop antenna. We have been able to produce both hollow
and centrally peaked plasmas in both gases and have demonstrated that
the plasma centre of symmtry shifts with the magnetic field axis as e
xpected. In argon, we have achieved a density in the order of 10(18) m
(-3) peaked on axis.