‰  NOW 35 WPM  ‰  TEXT IS FROM AUGUST 2012 QST  PAGE 48‰

MFJ 994BRT REMOTE AUTO TUNER THE MFJ 994BRT, WITH ITS 600 W SSB/CW
CAPABILITY, IS PERFECT FOR THE MANY MEDIUM POWER AMPLIFIERS ON THE MARKET.
THE PHOTOS ACCOMPANYING TABLE 2 SHOW THE OUTSIDE OF THE UNIT AND THE
INTERNAL CIRCUITRY.  NOTE THAT THE INDUCTORS CONSIST OF A MIX OF TOROIDAL
AND WIDE SPACED AIR WOUND INDUCTORS.  ARRL LAB TEST RESULTS ARE GIVEN IN
TABLE 2 AS YOU CAN SEE, THE MFJ 994BRT MATCHED ALL RESISTIVE LOADS
PRESENTED TO IT THAT WERE WITHIN ITS SPECIFIED TUNING RANGE.  AND WHILE
THERE WERE A FEW CASES IN WHICH THE SWR DIDNT REACH THE 1R5 1 TARGET, IN
MOST CASES THE TARGET SPECIFICATION WAS MET.  I MEASURED THE MFJ 994BRT
TUNER LOSSES USING THE 160 AND 80 METER SHORT ANTENNA SIMULATOR CIRCUITS
DESCRIBED EARLIER.  APPROXIMATELY 10 OF REAL RESISTANCE WAS ADDED TO
SIMULATE GROUND LOSSES.  THE MFJ 994BRT WAS ABLE TO MATCH A SIMULATED 43
FOOT VERTICAL FOR 80 METERS AND A SIMULATED 100 FOOT ANTENNA FOR 160 METERS
WITH POWER LOSS LESS THAN 10 AND MINIMUM SWR OF 1R3 1 ON 80 AND 1R7 1 ON
160.  MFJ 998RT REMOTE AUTO TUNER THE MFJ 998RT HANDLES A FULL 1500 W PEP
ON SSB OR CW.  CONSTRUCTION IS SIMILAR TO THE MFJ 994BRT WITH A MIX OF
TOROIDAL AND WIDE SPACED AIR WOUND INDUCTORS.  TABLE 3 SHOWS THE RESULTS OF
RESISTIVE LOAD TUNING RANGE AND LOSS MEASUREMENTS IN THE ARRL LAB.  IN MOST
CASES THE 1R5 1 TARGET SPECIFICATION WAS MET.  AS WITH THE MFJ994BRT, THE
‰  END OF 35 WPM TEXT  ‰  QST DE W1AW  ƒ