DESIGN AND DEVELOPMENT OF AN HF ANTENNA SYSTEM TUNER

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Authors
Corporate Authors
Petrie Telecommunications Ltd, Nepean ONT (CAN);Defence Research Establishment Ottawa, Ottawa ONT (CAN)
Abstract
This report describes the design and development of an automatic HF tuner done under a research and development contract with the Communications Research Centre. The HF tuner was designed to match into an efficient antenna developed at CRC to improve the performance of short range sky-wave communications. The HF tuner which feeds a balanced antenna system is unique. It uses solid state PIN diode switches capable of handling 1000 watts of transmitter power to select the tuning component in a matching - network. Circuits are incorporated into the tuner system to measures the antenna impedance. From a knowledge of the antenna impedance a microprocessor computes the initial components values required in a matching - network. The final component values are selected using a fine tuning algorithm that quickly provides a low value of VSWR. Measurements indicate the tuner can switch within less than a millisecond to any frequency in the bank from 2 to 15 MHz. Much development work was done on the PIN diode switches and the - network configuration. Sufficient funds were not granted to finalize the design of the digital controller, construct the measurement circuit boards to integrate the various systems into an operating tuner.
Keywords
Sky wave communication;Short range
Date of publication
25 Apr 1994
Number of Pages
113
DSTKIM No
95-00849
CANDIS No
149048
Format(s):
Hardcopy;Document Image stored on Optical Disk

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