Version 4 SHEET 1 2120 1076 WIRE -432 160 -464 160 WIRE -240 192 -288 192 WIRE -80 192 -160 192 WIRE 48 192 0 192 WIRE 144 192 112 192 WIRE 256 192 224 192 WIRE 400 192 336 192 WIRE 624 192 400 192 WIRE 672 192 624 192 WIRE 720 192 672 192 WIRE -432 224 -560 224 WIRE -464 256 -464 160 WIRE -432 256 -464 256 WIRE 400 256 400 192 WIRE 624 256 624 192 WIRE 720 256 720 192 WIRE -560 272 -560 224 WIRE -560 400 -560 352 WIRE -464 400 -464 256 WIRE -464 400 -560 400 WIRE 400 400 400 320 WIRE 400 400 -464 400 WIRE 624 400 624 336 WIRE 624 400 400 400 WIRE 720 400 720 320 WIRE 720 400 624 400 WIRE -560 416 -560 400 FLAG -560 416 0 FLAG 672 192 v_tank SYMBOL voltage -144 192 M270 WINDOW 0 49 68 VLeft 2 WINDOW 3 -50 144 VLeft 2 WINDOW 123 -50 86 VLeft 2 WINDOW 39 0 0 Left 2 SYMATTR InstName V3 SYMATTR Value "" SYMATTR Value2 AC 1 SYMBOL res 16 176 R90 WINDOW 0 0 56 VBottom 2 WINDOW 3 32 56 VTop 2 SYMATTR InstName Rr2 SYMATTR Value 439m SYMBOL cap 112 176 R90 WINDOW 0 0 32 VBottom 2 WINDOW 3 32 32 VTop 2 SYMATTR InstName Chead2 SYMATTR Value 25p SYMBOL res 240 176 R90 WINDOW 0 0 56 VBottom 2 WINDOW 3 32 56 VTop 2 SYMATTR InstName Rwire2 SYMATTR Value 222m SYMBOL ind 240 208 R270 WINDOW 0 32 56 VTop 2 WINDOW 3 5 56 VBottom 2 SYMATTR InstName Lwire2 SYMATTR Value 15µ SYMBOL cap 416 256 M0 SYMATTR InstName Cfoot2 SYMATTR Value 25p SYMBOL ind 640 240 M0 SYMATTR InstName L1 SYMATTR Value 200µ SYMATTR SpiceLine Rpar=200k SYMBOL cap 704 256 R0 SYMATTR InstName C2 SYMATTR Value 76.4p SYMBOL SpecialFunctions\\modulate -432 160 R0 WINDOW 3 16 120 Invisible 2 SYMATTR InstName A1 SYMATTR Value mark=frequency space=frequency SYMBOL voltage -560 256 M0 WINDOW 3 -121 104 Left 2 WINDOW 123 0 0 Left 2 WINDOW 39 0 0 Left 2 SYMATTR InstName V1 SYMATTR Value SINE(10m 7m 2k) TEXT -488 0 Left 2 !.tran 0 1m 0 5n TEXT 880 40 Left 2 ;sourcees: \nwww.w8ji.com/mobile_and_loaded_antenna.htm\nwww.daycounter.com/Calculators/Whip-Antenna-Design-Calculator.phtml\nRothammel - Antennenhandbuch TEXT 880 312 Left 2 ;Rr = 395 x (length / wavelength)^2 TEXT 880 352 Left 2 ;example of a 1MHz antenna, L=10m, D=1mm\nRr = 395 * (10m / 300m)^2\nRr = 439 mOhm TEXT 880 176 Left 2 ;Capacity Cant of ~11pF/m (depending on diameter) is divided into 2 parts, \nCfoot and Chead. Metal parts close to the foot are increasing this part. TEXT 880 256 Left 2 ;Inductivity Lwire is ~1.5µH/m, depending on length and diameter. TEXT 144 96 Left 2 ;Feeding the signal of a short antenna into a tuned circuit TEXT 624 144 Left 2 ;Q ca. 100 TEXT -488 72 Left 2 !.param frequency=1000k TEXT -488 32 Left 2 !;ac dec 10k 400k 2Meg TEXT -88 424 Left 2 ;Antenna RECTANGLE Normal 448 448 -96 128 2