‰  NOW 35 WPM  ‰
ADJUSTING THE GAIN DISTRIBUTION FROM MIC INPUT TO PA OUTPUT FOR MINIMUM
DISTORTION WILL BE DISCUSSED IN AN UPCOMING ARTICLE.  RF AMPLIFIER THE
EXCITERS OUTPUT RF AMPLIFIER USES A COMMON GATE JFET.  THIS STAGE PROVIDES
A BROADBAND RESISTIVE TERMINATION TO THE MIXER RF PORT IQ SUMMING JUNCTION
TO ISOLATE IT FROM VARIATIONS IN IMPEDANCE AT THE EXCITER OUTPUT.  THE RF
AMPLIFIER HAS RELATIVELY LOW GAIN, GOOD HARMONIC SUPPRESSION AND A VERY
CLEAN 0 DBM SSB SIGNAL AT THE OUTPUT.  THIS IS AN APPROPRIATE LEVEL TO
DRIVE A LINEAR AMPLIFIER, BALANCED MIXER OR TRANSVERTER.  IT IS ALSO A LOW
ENOUGH LEVEL THAT IT IS EASY TO ADJUST THE EXCITER WITH SIMPLE EQUIPMENT.
THE EXCITER OUTPUT SIGNAL MEETS FCC REGULATIONS FOR DIRECT CONNECTION TO AN
ANTENNA FOR FLEA POWER EXPERIMENTS.  THE TRANSMITTER IN FIGURE 2 ADDS THE
SIMPLE TWO TRANSISTOR CIRCUIT IN FIGURE 5, COPIED DIRECTLY FROM FIGURE 2R93
IN EMRFD, FOR 0R5 W PEP OUTPUT.  THE SEVENTH ORDER CHEBYCHEV LOW PASS
FILTER ON THE OUTPUT IS NON CRITICAL AND ASSURES A CLEAN SIGNAL THAT EASILY
MEETS FCC REGULATIONS.  SEE THE ACCOMPANYING TEXT IN EMRFD FOR A COMPLETE
DESCRIPTION.  SEVERAL OPTIONS FOR HIGHER POWER WILL BE EXPLORED IN A FUTURE
‰  FROM PAGE 92  ‰
W2WHP 1320 2 30 4,646 NLI AA2DC 1430 2 2 4,020 NLI AA0BA 952 2 2 3,198 NE
N3XLS 865 2 6 3,010 EPA Sullivan County AR Group W1YT 552 2 9 1,760 NH
WA4NKL 647 2 3 1,670 GA K9KL 1242 1 2 1,501 WI AB5CY 565 2 3 1,180 AR
‰  END OF 35 WPM TEXT  ‰  QST DE W1AW  ƒ