‰  NOW 40 WPM  ‰  TEXT IS FROM AUGUST 2012 QST  PAGE 42‰
INCH DIAMETER DISH HAS AN 8 INCH FOCAL LENGTH AND IS DESIGNED TO WORK WITH
A 400SR16 OR SIMILAR PIEZO TRANSDUCER PZT.  IT IS RATED TO ACHIEVE A
PRESSURE GAIN OVER THE SENSOR ALONE AT 40 KHZ OF 20 TO 25 DB PA AND NARROW
THE FIELD OF VIEW FROM 50 TO LESS THAN 3.  THE PARABOLIC DISH KIT INCLUDES
THE 12 INCH CLEAR PLASTIC DISH, A 400SR16 PZT, SENSOR PCB, THREE STRUTS,
INSTRUMENTATION BRACKET, PISTOL GRIP AND HARDWARE.  THE KIT MANUAL INCLUDES
ASSEMBLY INSTRUCTIONS, MOUNTING TECHNIQU

BATTERY BASED SYSTEMS ARE VERY INEFFICIENT DUE TO 30 LOSSES DURING CHARGING
AND 100 LOSSES ON ANY DAY THE BATTERIES ARE FULLY CHARGED AND EXCESS ENERGY
IS LOST.  IF YOU HAVE NOT LOOKED INTO SOLAR RECENTLY, DO NOT MAKE THE
MISTAKE THIS HAM DID BY THINKING IN TERMS OF BATTERY SYSTEMS.  BATTERIES
HAVE NO PART TO PLAY IN COST EFFECTIVE RENEWABLE ENERGY IF YOU HAVE ACCESS
TO THE GRID.  IT IS VERY IMPORTANT TO SEPARATE THE ECONOMICS OF YOUR 99R9
ROUTINE GRID TIE ENERGY MAINTENANCE FREE SYSTEM, FROM YOUR EXTREMELY RARE
0R1 POWER OUTAGE NEEDS.  FOR EMERGENCY POWER, FORGET WHOLE HOUSE BATTERIES.
INSTEAD, USE A GENERATOR OR YOUR VEHICLE ENERGY SYSTEM SEE FIGURE 3.  THE
LEAD PHOTOGRAPH SHOWS AN EXAMPLE OF SERIOUS POWER TO GO.  THE SOLAR PANELS
ON THE CAR PROVIDE 200 W WHILE THOSE ON THE TRAILER SHOWN OPEN PROVIDE 300
W.  TOGETHER THEY PROVIDE A CLEAN NOISE FREE POWER SOURCE AT ARRL FIELD DAY
OR ON A SOCCER FIELD.  THE SOLAR PANELS COMBINED WITH 12 V BATTERIES AND
INVERTERS PROVIDE 2 KW OF 115 V AC POWER PEAK AND 500 W AVERAGE, WHILE THE
SUN SHINES.  TWO DOLLARS PER WATT RECENTLY, SOLAR GRID TIE SYSTEMS HAVE
BECOME VERY COST EFFECTIVE, AS LOW AS 1/W ON INTERNET SPECIALS.  IN JUST

A TOYOTA PRIUS HYBRID HAS A 220 V DC POWER SYSTEM WITH A GENERATOR CAPABLE
OF 50 KW PEAK POWER.  DRAWING JUST 10 KW FROM THE SYSTEM COULD POTENTIALLY
POWER A HALF DOZEN HOUSES DURING A BLACKOUT.  PRESENTLY, OF COURSE, NO EVS
EXCEPT FOR THE LEAF OPTION OR HYBRIDS GIVE THE CONSUMER DIRECT ACCESS TO
THIS POWER AND THERE ARE NO EASY WAYS TO USE THE HIGH VOLTAGE DC DIRECTLY
AT THOSE POWER LEVELS.  BUT INDIRECTLY, USING AN ADDED 1 KW INVERTER NOTED
ABOVE, THE PRIUS AND SOME OTHER HYBRIDS CAN GENERATE ADEQUATE POWER OVER
LONG PERIODS BECAUSE GAS ENGINE STARTS AND STOPS AUTOMATICALLY TO MAINTAIN
CHARGE IN ITS HIGH VOLTAGE BATTERY.  THE PRIUS 220 V SYSTEM USES A
SWITCHING CONVERTER TO PROVIDE UP TO 100 A FOR 12 V ACCESSORIES.  THROUGH
AN ADD ON HOBBY INVERTER, THIS CAN SUPPLY ABOUT 1 KW OF CONTINUOUS 120 V AC
POWER.  SEE FIGURE 3.  JUST LEAVE THE IGNITION ON.  AT 1 KW, IT RUNS ABOUT
3 MINUTES ON AND 4 MINUTES OFF.  AT A 200 W DRAW IT IS MORE LIKE 3 ON AND
20 MINUTES OFF.  INSIDE THE HOUSE, DRAW WHATEVER YOU NEED AT ANY TIME, AND
THE CAR WILL TAKE CARE OF ITSELF.  GAS EFFICIENCY IS ABOUT 5 KWH PER
GALLON, SIMILAR TO MOST SMALL GENERATORS.  SOLAR POWER SYSTEMS OTHER NEW
SOURCES OF HIGH VOLTAGE DC ARE HOME AND PORTABLE SOLAR SYSTEMS.  GRID TIE
INVERTERS OPERATE ABOVE 95 EFFICIENCY AT HIGH DC VOLTAGE AND HAVE 100
EFFICIENT GRID STORAGE NET METERING.  ON THE OTHER HAND, LOW VOLTAGE
‰  END OF 40 WPM TEXT  ‰  QST DE W1AW  ƒ