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home | newest check | boards | help index | log | ps | userlogin | send sysop | slog | status forward | bcm news | users | version | remove cookieG8MNY > TECH 10.05.24 16:24l 78 Lines 2639 Bytes #6 (0) @ WW BID : 7362_GB7CIP Subj: 70cm Bowtie Beam Path: JH4XSY<N3HYM<K5DAT<PY2BIL<LU9DCE<LU4ECL<ED1ZAC<GB7CIP Sent: 240510/0718Z @:GB7CIP.#32.GBR.EURO #:7362 [Caterham Surrey GBR] $:7362_GB From: G8MNY@GB7CIP.#32.GBR.EURO To : TECH@WW GAIN FIG 10 dB <................. 550mm.................> + + + + + + + + + + + + + + + + + + + + + + + + + + 550mm + + 00 + + + + + + + + + + + + + + + + + + + + ++++++++++++++++++++++++++++++++++++++++++ SIZE OF ELEMENTS(INSIDE) 170_175mm, ELEMENTS MADE FROM 6MM CABLE REFLECTOR MADE FROM GARDEN MESH (SQUARES NO MORE THAN 15_20mm) CLOSE UP OF BOWTIE ELEMENTS + + + + + + +# |+ + # | + + # | + + # | + BRADE OF COAX >> << CENTRE OF COAX THE BOWTIE IS MADE FROM 1 PIECE OF CABLE ( LIKE 2 W'S PUT TOGETHER BUT NOT JOINED IN THE MIDDLE) SOLDER COAX TO BOWTIE AS SHOWN IN CLOSE UP DISTANCE OF BOWTIE FROM REFLECTOR 100mm. MOVE IN & OUT TO VSWR. TO SUPPORT BOWTIE USE 19mm PLASTIC OVERFLOW TUBE. TO FIX ONTO MESH USE A STRAIGHT PLASTIC OVERFLOW TANK FITTING. YOU CAN ALSO USE A TANK FITTING ON THE BOWTIE END. CUT A CROSS SHAPE DOWN THE THREADED END & FIT BOWTIE INTO CUT-OUTS. FEED THE COAX DOWN PLASTIC OVERFLOW FIX BACK NUT ON THREADED END. INSERT A PLASTIC WINE CORK INTO END TO STOP FITTING FROM COLLAPSING. TIGHTEN BACK NUT ONTO BOWTIE. IF THE BOWTIE SEEMS FLOPPY YOU CAN FIT 2 22mm POLY WASHERS NEXT TO THE BACK NUT/BOWTIE SANDWICH. TO WATERPROOF ROUND COAX JOINTS & PLASTIC FITTING USE SILICON MASTIC. TO MOUNT THE BOWTIE BEAM I USED A TV U BRACKET. THIS WAS BOLTED TO THE BACK OF THE REFLECTOR. DIMENSIONS & MATERIALS USED SIZE OF MESH FOR REFLECTOR 550mm SQUARE DISTANCE FROM REFLECTOR TO BOWTIE 100 MM APPROX SIZE OF ELEMENTS(INSIDE MEASUREMENTS) 170 - 175mm REFLECTOR GARDEN MESH ( 15-20mm SQUARES ) 2 PLASTIC STRAIGHT TANK CONNECTORS ( LONG THREAD IF POSSIBLE ) PLASTIC OVERFLOW PIPE PLASTIC WINE CORK 6mm CABLE SILICON MASTIC TV U BRACKET LASTLY HAVE FUN BUILDING THE BOWTIE. I HAVE USED THIS ANTENNA FOR 10 YEARS & HAVE WORKED SOME GOOD DX. IF YOU HAVE ANY PROBLEMS ON BUILDING THE BOWTIE BEAM DROP ME A LINE. TO ANDY G6OHM @ GB7HOL.22#.GBR.EU E.O.F Why Don't U send an interesting bul? 73 De John, G8MNY @ GB7CIP
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