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Ham Radio
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Ham Radio CD-ROM (Emerald Software) (1995).ISO
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hamutil1
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lowpass.bas
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BASIC Source File
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1985-05-09
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2KB
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49 lines
10 REM USE THIS ON YOUR REATER TO AVOID EXCESSIVE SIDEBANDS
20 INPUT"TURN ON PRINTER AND RETURN";R
30 LPRINT
40 LPRINT" SHARP CUT-OFF"
50 LPRINT" LOW-PASS FILTER DESIGN"
60 LPRINT" ----------------------"
70 LPRINT
80 LPRINT"FROM HAM RADIO MAGAZINE - JANNUARY 1974"
90 LPRINT
100 LPRINT"CAPACITORS ARE MATCHED TO ONE PERCENT"
110 LPRINT"THE RESISTOR TERMINATOR SHOULD BE ONE PERCENT"
120 LPRINT
130 LPRINT"THIS FILTER PROVIDES FLAT RESPONSE TO THE CUTOFF"
140 LPRINT"FREQUENCY AND 25-30 DB ATTENUATION TO HIGHER FREQUENCIES"
150 LPRINT
160 LPRINT"DUAL WINDING 44 MHY TELEPHONE TOROIDS MAY BE USE TO"
170 LPRINT"MAKE BOTH THE 88 MHY AND THE 22 MHY INDUCTORS"
180 LPRINT
190 LPRINT"TO MAKE 22 MHY INDUCTORS, CONNECT THE TWO LEEDS WITH"
200 LPRINT"SPAGHETTI TOGETHER AND CONNECT TWO WITHOUT TOGETHER"
210 LPRINT"THIS PLACES THE TWO WINDINGS IN PARALLEL"
220 LPRINT
230 LPRINT"TO MAKE 88 MHY COILS,CONNECT THE TWO WINDINGS IN SERIES"
240 LPRINT:LPRINT
250 LPRINT" (C) CUT-OFF (R)"
260 LPRINT" CAP. FREQ. RES."
270 LPRINT" UFD. HZ. OHMS"
280 LPRINT"-----------------------"
290 LPRINT:LPRINT
300 IF A$<>""THEN GOTO 510
310 FOR C=.05 TO .21 STEP 5.000001E-03
320 A=C/1000000!
330 F=SQR((.75)/(A*9.86959*8.800001E-02))
340 R=3.14159*8.800001E-02*F
350 LPRINT USING "#.###";C;
360 LPRINT USING "#########";F;
370 LPRINT USING "#########";R
380 NEXT C
390 PRINT"CHANGE PAPER IF PAGE PRINTER"
400 INPUT"SPACE AND RETURN FOR PAGE 2";A$
410 IF A$<>""THEN GOTO 390
420 LPRINT:LPRINT:LPRINT
430 LPRINT" -----( C )----- -----( C )-----"
440 LPRINT" : : : :
450 LPRINT" O---+---( L/4 )---+---( L )---+---( L/4 )---+---O"
460 LPRINT" INPUT : : : OUTPUT"
470 LPRINT" LOW-Z ( C ) ( C ) ( R ) HIGH-Z"
480 LPRINT" : : :"
490 LPRINT" O------------------------