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HamCall (October 1991)
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HamCall (Whitehall Publishing)(1991).bin
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psa.asc
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1990-10-14
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2KB
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53 lines
10 CLS
30 PRINT" PSA calculator Program"
40 INPUT" Transmitter Power (unmodulated) please";PHI
50 INPUT" Reduced Power Required:";PLOW
60 INPUT" Frequency in kHz:";F
70 INPUT" Impedance (usualy 50 ohms):";Z
80 REM
90 REM
100 REM
110 REM
120 PDIF=PHI - PLOW
130 PRINT"....WORKING"
140 IHI=SQR(PHI/Z):ILOW=SQR(PLOW/Z)
150 IDIF=PHI - PLOW
160 IDUMMY=SQR(IDIF/Z)
170 MI=SQR(PDIF/PLOW)
180 XL= Z/MI: REM INDUCTOR
190 XC= (MI*Z): REM CAPACITOR
200 L=159*XL/F: REM 159=1/2*Pi. L IN uHy
210 C=159000000#/(F*XC): REM C IN pF
220 REM
230 REM
240 REM
250 PRINT"For ";PLOW;" watts, you will need"
260 PRINT"an inductor of ";L;" uHy in series"
270 PRINT"with your dummy load. And a capacitor"
280 PRINT"of ";C;" pF in series with the "
290 PRINT"antenna system."
300 PRINT
310 PRINT
320 PRINT
330 PRINT"The current from the transmitter is ";IHI;" amps."
340 PRINT"The current to the antenna system is ";ILOW;" amps."
350 PRINT"The current to the dummy load is ";IDUMMY;" amps."
360 INPUT"Again ";A$: A=ASC(A$):IF A=78 OR A=110 THEN END
370 GOTO 40
380 REM
390 REM
400 REM based on a circuit by Earl Travis
410 REM See George Brown & John Balwin article
420 REM "Adjusting Unequal Tower Broadcast
430 REM Arrays" from the December 1943 issue of
440 REM Electronics.
450 REM
460 REM by bob groome
470 REM 824 W. Main St.
480 REM Richmond, In 47374
490 REM release for all non-commercial uses.
500 REM it is reccomended that these results
510 REM be confirmed by your professional
520 REM broadcast engineering consultant
530 REM 4/24/87