BASIC DESIGN PROCEDURE FOR LORAN TRANSMITTERS USING HIGH POWER, HALF CYCLE GENERATORS

M. Dishal

Peer Reviewed

Abstract:	Because of the availability of high level solid state switches, it is now practical to implement efficient pulse transmitters in the 100 kHz frequency region by. discharging, in sequence, a multitude of high level half cycle generators into a properly designed RF output circuit; this circuit must include the actual radiating antenna. This paper presents design equations which are directly applicable to the RF circuit design of such a transmitter, and shows that the simplest practical overall output circuit turns out to be a straightforward double tuned bandpass filter. Because, in the 100 kHz carrier region being considered, the natural antenna bandwidth is often very much narrower than that required to “pass” the desired pulse rise time, the paper considers in detail both the phenomenon involved and the circuit design involved which will enable an antenna current having any specified pulse rise time to be produced no matter how narrow the natural antenna bandwidth may be. It is important to realize that this capability is accomplished without the addition of power consuming loading resistors. After the half cycle generators-overall network combination has been designed to produce the desired pulse leading edge, one is faced with the problem of correctly discharging the network so that it produces a specified pulse decay shape. This problem is also considered in this paper and design equations are presented for the switched-in network which must be used to produce a specified pulse decay shape.
Published in:	NAVIGATION: Journal of the Institute of Navigation, Volume 23, Number 2
Pages:	136 - 148
Cite this article:	Dishal, M., "BASIC DESIGN PROCEDURE FOR LORAN TRANSMITTERS USING HIGH POWER, HALF CYCLE GENERATORS", NAVIGATION: Journal of The Institute of Navigation, Vol. 23, No. 2, Summer 1976, pp. 136-148.
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