Version 4 SHEET 1 948 680 WIRE 448 -176 384 -176 WIRE 576 -176 512 -176 WIRE 736 -176 576 -176 WIRE 832 -176 736 -176 WIRE 576 -128 576 -176 WIRE 832 -128 832 -176 WIRE -384 -96 -512 -96 WIRE -256 -96 -304 -96 WIRE -32 -96 -256 -96 WIRE 48 -96 -32 -96 WIRE 384 -96 384 -176 WIRE 384 -96 304 -96 WIRE -512 -48 -512 -96 WIRE -256 -48 -256 -96 WIRE 736 -48 736 -176 WIRE 576 -16 576 -64 WIRE 656 -16 576 -16 WIRE 832 -16 832 -48 WIRE 928 -16 832 -16 WIRE 832 16 832 -16 WIRE 576 32 576 -16 WIRE 48 48 -160 48 WIRE 384 48 304 48 WIRE -256 64 -256 16 WIRE 928 64 928 -16 WIRE -512 80 -512 32 WIRE -32 96 -32 -96 WIRE 384 144 384 48 WIRE 448 144 384 144 WIRE 576 144 576 96 WIRE 576 144 512 144 WIRE 736 144 736 16 WIRE 736 144 576 144 WIRE 832 144 832 96 WIRE 832 144 736 144 WIRE -160 176 -160 48 WIRE -32 224 -32 176 WIRE -32 224 -112 224 WIRE -208 240 -512 240 WIRE 176 272 176 128 WIRE 368 272 176 272 WIRE 656 272 656 -16 WIRE 656 272 448 272 WIRE 720 272 656 272 WIRE 848 272 800 272 WIRE 896 272 848 272 WIRE 928 272 896 272 WIRE -512 288 -512 240 WIRE -32 304 -32 224 WIRE 656 336 656 272 WIRE 848 336 848 272 WIRE -192 352 -192 288 WIRE -512 416 -512 368 WIRE -432 416 -512 416 WIRE -32 432 -32 368 WIRE -432 448 -432 416 WIRE 656 448 656 400 WIRE 848 448 848 400 WIRE -512 464 -512 416 WIRE -512 576 -512 528 WIRE -432 576 -432 528 FLAG -432 576 0 FLAG -32 432 0 FLAG -512 576 0 FLAG -512 80 0 FLAG -256 64 0 FLAG -192 352 0 FLAG 848 448 0 FLAG 928 64 0 FLAG 896 272 audio FLAG 656 448 0 SYMBOL voltage -512 272 M0 WINDOW 123 24 132 Left 0 WINDOW 39 27 158 Left 0 SYMATTR Value2 AC .1 SYMATTR SpiceLine Rser=600 SYMATTR InstName V1 SYMATTR Value SFFM(0 0.1 10.7meg 20 5k) SYMBOL res -288 -112 R90 WINDOW 0 0 56 VBottom 0 WINDOW 3 32 56 VTop 0 SYMATTR InstName R1 SYMATTR Value 1k SYMBOL cap -48 304 R0 SYMATTR InstName C1 SYMATTR Value 2.2n SYMBOL res -448 432 R0 SYMATTR InstName R3 SYMATTR Value 47k SYMBOL cap -496 464 M0 SYMATTR InstName C2 SYMATTR Value 1n SYMBOL voltage -512 -64 R0 WINDOW 123 0 0 Left 0 WINDOW 39 0 0 Left 0 SYMATTR InstName V2 SYMATTR Value 120 SYMBOL cap -272 -48 R0 SYMATTR InstName C3 SYMATTR Value 10n SYMBOL res -48 80 R0 SYMATTR InstName R4 SYMATTR Value 22k SYMBOL FM_IF_detector_TX2 160 -32 R0 SYMATTR InstName U2 SYMATTR SpiceLine Cp=10p Cs=10p Lp=16.6u Ls=22.08u Rs=1meg SYMBOL diode 448 -160 R270 WINDOW 0 32 32 VTop 0 WINDOW 3 0 32 VBottom 0 SYMATTR InstName D1 SYMATTR Value OA91 SYMBOL diode 512 128 R90 WINDOW 0 0 32 VBottom 0 WINDOW 3 32 32 VTop 0 SYMATTR InstName D2 SYMATTR Value OA91 SYMBOL cap 592 -128 M0 SYMATTR InstName C4 SYMATTR Value 100p SYMBOL res 816 -144 R0 SYMATTR InstName R2 SYMATTR Value 47k SYMBOL res 816 0 R0 SYMATTR InstName R5 SYMATTR Value 47k SYMBOL res 816 256 R90 WINDOW 0 0 56 VBottom 0 WINDOW 3 32 56 VTop 0 SYMATTR InstName R6 SYMATTR Value 12k SYMBOL cap 832 336 R0 SYMATTR InstName C5 SYMATTR Value 1n SYMBOL cap 592 32 M0 SYMATTR InstName C6 SYMATTR Value 100p SYMBOL cap 640 336 R0 SYMATTR InstName C7 SYMATTR Value 100p SYMBOL polcap 720 -48 R0 SYMATTR InstName C8 SYMATTR Value .5µF ic=10 SYMBOL res 464 256 R90 WINDOW 0 0 56 VBottom 0 WINDOW 3 32 56 VTop 0 SYMATTR InstName R7 SYMATTR Value 100 SYMBOL Valve\\Tetrode -160 224 R0 SYMATTR InstName U1 SYMATTR SpiceModel EF80 TEXT -520 -240 Left 0 ;.ac lin 100 5meg 15meg TEXT -520 -336 Left 0 ;Demonstration of FM IF ratio detector, EF80 pentode. TEXT -520 -200 Left 0 !.tran 2ms uic TEXT -520 -280 Left 0 ;enable either of the following: TEXT 48 464 Left 0 !.model OA91 D(Ron=1 Roff=1meg Vfwd=.35)