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PRODUCT REVIEW  MEDIUM TO HIGH POWER AUTO ANTENNA TUNERS THE EVOLUTION
CONTINUES REVIEWED BY JOEL R. HALLAS, W1ZR  QST TECHNICAL EDITOR  WE LAST
LOOKED AT A SELECTION OF AUTOMATIC ANTENNA TUNERS IN MAY 2004.  AT THAT
TIME, WE PICKED FOUR EXAMPLES, TWO DESIGNED FOR REMOTE OPERATION AND TWO
DESKTOP UNITS.  WHILE DIFFERENT IN MANY WAYS, THEY ALL WERE LIMITED TO 100
TO 200 W.  HIGHER POWERED AUTOMATIC ANTENNA TUNERS HAVE BEEN AVAILABLE, BUT
THEY WERE EITHER BUILT INTO HIGH POWERED AMPLIFIERS ICOM OR YAESU, FOR
EXAMPLE, WERE DESIGNED FOR REMOTE OPERATION AS IN THE SGC SG 235, OR HAVE
BEEN DISCONTINUED, AS IN THE CASE OF THE TEN TEC 253.  HIGH POWERED
AUTOMATIC ANTENNA TUNERS INITIALLY APPEARED IN THE 1980S THE HEATH 2500,3
J. W. MILLER AT2500, AND DAIWA CNA 10015 BUT THEY WERE NOT AS SOPHISTICATED
AS THE UNITS REVIEWED HERE, REQUIRING SOME MANUAL ADJUSTMENT OR PRESETTING
OF THE INDUCTOR FOR BEST OPERATION.  MODERN SOLID STATE TRANSCEIVERS AND
LINEAR AMPLIFIERS WITH THEIR NO TUNE OUTPUT STAGES HAVE BEEN WELL RECEIVED,
ESPECIALLY BY THOSE OF US WHO GREW UP IN THE VACUUM TUBE ERA.  THE TYPICAL
TRANSMITTER OF THAT TIME REQUIRED CAREFUL ADJUSTMENT OF THE TRANSMITTER
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335 4X1FQ/375 4X4DK/386 4X4JU/383 4X6UO/341 9A1HDE/353 9A2AA/364 9A2OM/342
9A2YM/353 9A4A/368 9A7V/341 9A8A/341 9A9A/344 AA1K/346 AA1V/348 AA4H/346
AA4S/358 AA4Z/358 AA7A/348 AA7AV/340 AB0X/348 AB8K/352 AB9E/346 AD5A/340
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