2020 LOCATE ,T:PRINT " CALLDEFSNGSOUNDSOUNDSOUNDSOUNDSOUNDSOUNDSOUNDSOUND L SOUNDSOUNDSOUNDSOUNDSOUNDSOUNDSOUNDSOUNDDEFDBLCALLDEFSNGSOUNDSOUNDSOUNDSOUNDSOUNDSOUNDSOUNDSOUND L SOUNDSOUNDSOUNDSOUNDSOUNDSOUNDSOUNDSOUNDDEFDBLCALL "
2050 LOCATE ,T:PRINT " CALLDEFSNGSOUNDSOUND C SOUNDSOUNDDEFDBLCALLDEFSNGSOUNDSOUNDSOUND W SOUNDSOUNDSOUNDDEFDBLOPENDEFSNGSOUNDSOUNDSOUND W SOUNDSOUNDSOUNDDEFDBLCALLDEFSNGSOUNDSOUND C SOUNDSOUNDDEFDBLCALL "
2060 LOCATE ,T:PRINT " D^ cylinder OPEN D^ cylinder "
2070 LOCATE ,T:PRINT " 50-75 - coaxial feedline "
2080 COLOR 7,0
2090 RETURN
2100 '
2110 '.....notes #1
2120 M=7
2130 PRINT TAB(M);
2140 PRINT " CYLOAD is an EXPERIMENTAL antenna devised by Hal Wright, W9UYA,"
2150 PRINT TAB(M);
2160 PRINT "who reports that it performs well. It does not claim any practical"
2170 PRINT TAB(M);
2180 PRINT "advantage over other short dipole types but it does re-open an area"
2190 PRINT TAB(M);
2200 PRINT "of antenna design not often mentioned in current amateur radio"
2210 PRINT TAB(M);
2220 PRINT "literature. The program provides calculations for those who might"
2230 PRINT TAB(M);
2240 PRINT "like to experiment further with this concept."
2250 PRINT TAB(M);
2260 PRINT " Previous discussions of cylindrical loads in amateur radio"
2270 PRINT TAB(M);
2280 PRINT "literature have assumed the length and diameter of the loading"
2290 PRINT TAB(M);
2300 PRINT "cylinder to be equal. CYLOAD does not impose this limitation."
2310 PRINT TAB(M);
2320 PRINT " Cylinders may be rolled from roofers' flashing sheets or metal"
2330 PRINT TAB(M);
2340 PRINT "screening, or cut from copper water pipe or aluminum tubing."
2350 PRINT TAB(M);
2360 PRINT " Practical field tests by W9UYA indicate that antennas built to"
2370 PRINT TAB(M);
2380 PRINT "this design resonate at very close to the design frequency in the"
2390 PRINT TAB(M);
2400 PRINT "range of 7 MHz to 21.5 MHz. At 24.8 - 148 MHz it may be advisable"
2410 PRINT TAB(M);
2420 PRINT "to increase the design length of the inner wires by about 10% to"
2430 PRINT TAB(M);
2440 PRINT "allow for pruning to resonance at the design frequency."
2450 PRINT TAB(M);
2460 PRINT " The fundamental equation for a CYLOAD antenna is:"
2470 PRINT TAB(M);
2480 PRINT "Zc = Zw x tan Lw x tan Lc, where: Zc = impedance of cylinder (-)"
2490 PRINT TAB(M);
2500 PRINT " Zw = impedance of wire (-)"
2510 PRINT TAB(M);
2520 PRINT " Lw = length of wire (<UNK! {00F8}>)"
2530 PRINT TAB(M);
2540 PRINT " Lc = length of cylinder (<UNK! {00F8}>)"
2550 PRINT TAB(M);
2560 PRINT " A transmatch at the station end of the feedline is recommended.";
2570 RETURN
2580 '
2590 '.....notes#2
2600 PRINT TAB(M);
2610 PRINT " Special thanks go to L.B.Cebik, W4RNL, for his encouragement in"
2620 PRINT TAB(M);
2630 PRINT "the development of the CYLOAD antenna, and for the many computer"
2640 PRINT TAB(M);
2650 PRINT "models he has run to check out the viability and accuracy of the"
2660 PRINT TAB(M);
2670 PRINT "design. These models and the practical field tests by Hal Wright,"
2680 PRINT TAB(M);
2690 PRINT "W9UYA, indicate that good performance characteristics are possible"
2700 PRINT TAB(M);
2710 PRINT "in the 3.5 to 28 MHz range."
2720 PRINT TAB(M);
2730 PRINT " The CYLOAD concept is based on equations usually applied to cases"
2740 PRINT TAB(M);
2750 PRINT "where the conductor diameter is an insignificant percentage of a"
2760 PRINT TAB(M);
2770 PRINT "wavelength (e.g., at LF and VLF frequencies). At HF and above the"
2780 PRINT TAB(M);
2790 PRINT "percentage becomes more significant and the equations become"
2800 PRINT TAB(M);
2810 PRINT "increasingly more inaccurate. Above 21 MHz allowance should be made"
2820 PRINT TAB(M);
2830 PRINT "for further experimentation and pruning."
2840 PRINT TAB(M);
2850 PRINT " The program provides for slightly altering the design diameter"
2860 PRINT TAB(M);
2870 PRINT "of the cylinder to suit a similar size standard pipe or tube. This"
2880 PRINT TAB(M);
2890 PRINT "feature must be used with caution, since changing the diameter"
2900 PRINT TAB(M);
2910 PRINT "decreases the accuracy of all other calculations. A better way to"
2920 PRINT TAB(M);
2930 PRINT "arrive at a different diameter is to re-run the program and select"
2940 PRINT TAB(M);
2950 PRINT "a different cylinder length."
2960 RETURN
2970 '
2980 'HARDCOPY
2990 GOSUB 3100:LOCATE 25,2:COLOR 14,6
3000 PRINT " Press 1 to print screen, 2 to print screen & ";
3010 PRINT "advance paper, or 3 to continue.";:COLOR 7,0