An improved high efficiency 500 kilowatt short wave broadcasttransmitter with novel features
Mina, A.
Weldon, J.O.
Hulsey, G.
This paper appears in: Broadcasting, IEEE Transactions on
Publication Date: Jun 1988
Volume: 34,
Issue: 2
On page(s): 134-136
ISSN: 0018-9316
References Cited: 0
CODEN: IETBAC
INSPEC Accession Number: 3232480
Digital Object Identifier: 10.1109/11.1427
Current Version Published: 2002-08-06
Abstract
Some of the changes in international broadcaster's HF
(high-frequency) transmitter needs are addressed, along with some
adaptations in HF transmitter design to reflect those needs. The authors
identify three fundamental changes in the emphasis of international
broadcast transmitter requirements: due to increasing energy costs, more
emphasis has been placed on equipment power efficiency; due to
increasing labor costs, more attention is being paid to automation and
ease of maintenance, i.e. manpower efficiency; and, third, because of
spectrum crowding, improved spectral occupancy has become a concern,
particularly with respect to transmitted signal purity, and
spectral-efficient modulation modes. Several developments designed to
meet these needs of broadcasters are described. The issue of power
efficiency has been met with improved transmitter RF and modulator
circuits. RF efficiency has been improved in part by lowering losses in
RF output coupling circuits. This improvement is afforded by better
network design, and better automatic tuning, i.e. tuning for best
efficiency. More efficient RF output tubes have also been
developed
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