AN ORIGINAL DESIGN BY ASHHAR FARHAN VU2ESE

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Presentation transcript:

AN ORIGINAL DESIGN BY ASHHAR FARHAN VU2ESE THE BITx40 RADIO PROJECT AN ORIGINAL DESIGN BY ASHHAR FARHAN VU2ESE

BITX40-BITX20 THE EARLY DAYS THE GENESIS OF THIS TRANSCEIVER CAME FROM THE MIND OF farhan WHILE ON A LONG FLIGHT. WHAT COULD BE MADE IN A COST EFFICTIVE MANNER TO PROVIDE THE HAM Of INDIA WITH A TRANSCEIVER THAT MIGHT HAVE A FINAL COST OF $7-$15? THE DESIGN TOOK INSPIRATION FROM AN ARRL BOOK AND BECAME A UNIT USING BI-DIRECTIONAL AMPLIFIER STAGES

BI-DIRECTIONAL AMPLIFIER STAGE

SIMPLE COHN LADDER FILTER AT 12 MHZ

DIODE RING BALANCED MIXER FRONT END/DEMOD

CRYSTAL CONTROL BFO USING SAME XTAL AS I.F.

TRANSMITTER DRIVER & FINAL STAGE IRF510 FET

SINGLE BANDPASS FILTER USED IN RX & TX

LOW PASS FILTER ON OUTPUT

WHERE TO NOW. WWW. HFSIGS. COM https://groups WHERE TO NOW? WWW.HFSIGS.COM https://groups.io/g/BITX20/ users group http://bitxhacks.blogspot.com/ BITx40 hacks

THE WORLD IS IS IN THE HOME BREW FINAL ON BITx40/20/80/60

YOU CAN DO IT, GET ON 40 METERS 7195 KHz WITH SSB FOR $69+