‰  NOW 13 WPM  ‰  TEXT IS FROM JULY 2014 QST  PAGE 57  ‰

SIMPLE BIAS SCHEMES USED FOR EARLIER MMICS DONT WORK WELL.  I USED A COMMON
7805 THREE TERMINAL REGULATOR TO SUPPLY 5 V, SHOWN IN THE FIGURE 2
SCHEMATIC.  THE MMICS ARE SO INEXPENSIVE, AND THE CIRCUIT SO SIMPLE, THAT
THE TOTAL PARTS COST FOR AN LNA IS AROUND 10, INCLUDING A METAL CASE SUCH
AS THE SMALL ALTOIDS TINS SHOWN IN FIGURE 3.  THIS IS LESS THAN THE COST OF
THE LOW LOSS TUNING CAPACITORS USED IN GAAS FET AND PHEMT LNAS.  AN
AFFORDABLE LNA MAKES IT POSSIBLE TO BUILD SEVERAL AND HAVE SOME SPARES.
ƒ  QST DE W1AW  ‰
RESULTS AT THE RECENT 2014 EASTERN VHF/UHF CONFERENCE, I GOT A CHANCE TO
MEASURE TWO OF MY MMIC LNAS ON MODERN, CALIBRATED TEST EQUIPMENT PROVIDED
BY GREG BONAGUIDE, WA1VUG.  THE RESULTS, IN FIGURE 4, CONFIRM THAT THE
SIMPLE, INEXPENSIVE LNA HAS EXCELLENT PERFORMANCE UP TO AT LEAST THE 2R3
GHZ BAND.  THE BLUE AND RED LINES REPRESENT THE MEASURED NOISE FIGURES THE
GRAY AND GREEN LINES REPRESENT THE MEASURED GAIN FIGURES.  ON THE AIR
‰  END OF 13 WPM TEXT  ‰  QST DE W1AW  ƒ