home
***
CD-ROM
|
disk
|
FTP
|
other
***
search
/
Antennas
/
Antennas_CD-ROM_Walnut_Creek_September_1996.iso
/
w4mb
/
vol1
/
basic
/
symtee.asc
< prev
next >
Wrap
Text File
|
1996-06-30
|
2KB
|
42 lines
100 CLS : PRINT " ************************************"
110 PRINT " * SYMMETRICAL TEE ANTENNAS *"
120 PRINT " * REFERENCE-HENNEY, PAGE 20-10 *"
130 PRINT " * RADIO ENGINEERING HANDBOOK *"
140 PRINT " * PROGRAM COPYRIGHT 1985 *"
150 PRINT " * R.P. HAVILAND, W4MB *"
160 PRINT " ************************************"
170 REM PROGRAM 9
180 DEF FNP (X) = INT(10 * X + .5) / 10
200 PRINT : PRINT " A TEE ANTENNA IS FED AGAINST GROUND"
210 PRINT : PRINT : PRINT " TTTTTTTTTTTTT SIDES EQUAL"
220 PRINT " T"
230 PRINT " T LENGTH"
240 PRINT " T"
250 PRINT " T FEED AT"
260 PRINT " T F-F"
270 PRINT " F"
300 PRINT
310 PRINT " GGGGGGGGGGFGGGGGGGGGG GROUND "
320 PRINT : PRINT " PRESS A KEY TO CONTINUE"
330 Q$ = INKEY$: IF Q$ = "" GOTO 330
340 PRINT : PRINT : PRINT "ENTER HEIGHT OF VERTICAL PART OF ANTENNA, FEET": INPUT VE
350 PRINT "ENTER LENGTH OF TEE ARM, CENTER TO END, FEET": INPUT TE
360 RE = TE / VE
370 IF RE <= .22 THEN KF = 1.35 + RE * .18 / .22: GOTO 420
380 IF RE <= .35 THEN KF = 1.53 + (RE - .22) * .22 / .13: GOTO 420
390 IF RE <= .62 THEN KF = 1.75 - (RE - .35) * .22 / .27: GOTO 420
400 IF RE <= 1 THEN KF = 1.53 + (RE - .62) * 9.000001E-02 / .38: GOTO 420
410 IF RE > 1 THEN PRINT "VALUES OUTSIDE RANGE": GOTO 200
420 WA = KF * (VE + TE)
430 FO = 300000! / WA
440 PRINT
450 PRINT "THE WAVELENGTH OF RESONANCE IS "; FNP(WA); " METERS"
460 PRINT "THE RESONANT FREQUENCY IS "; FNP(FO); " KILOHERTZ"
470 PRINT : PRINT "THE ACCURACY IS ESTIMATED TO BE +/- 5 %"
480 PRINT "FOR BEST PERFORMANCE, USE RADIALS AT LEAST "; FNP(.656 * WA); "FEET LONG"
500 PRINT : PRINT "PRESS R TO RERUN, ANY OTHER KEY TO STOP"
510 Q$ = INKEY$: IF Q$ = "" GOTO 510
520 IF Q$ = "R" OR Q$ = "r" THEN RUN
530 END