Version 4 SHEET 1 3756 944 WIRE 288 144 192 144 WIRE 464 144 288 144 WIRE 640 144 560 144 WIRE 672 144 640 144 WIRE 784 144 752 144 WIRE 896 144 784 144 WIRE 1232 144 992 144 WIRE 1296 144 1232 144 WIRE 1472 144 1360 144 WIRE 1472 160 1472 144 WIRE 464 176 416 176 WIRE 608 176 560 176 WIRE 640 176 640 144 WIRE 784 176 784 144 WIRE 896 176 848 176 WIRE 1040 176 992 176 WIRE 1232 176 1232 144 WIRE -464 192 -608 192 WIRE -224 192 -384 192 WIRE -176 192 -224 192 WIRE -80 192 -112 192 WIRE -32 192 -80 192 WIRE 64 192 32 192 WIRE 128 192 64 192 WIRE -224 208 -224 192 WIRE -80 208 -80 192 WIRE -608 224 -608 192 WIRE 64 240 64 192 WIRE 288 240 288 144 WIRE 192 256 192 240 WIRE 1472 256 1472 240 WIRE 640 288 640 256 WIRE 720 288 640 288 WIRE 784 288 784 256 WIRE 784 288 720 288 WIRE 1232 288 1232 256 WIRE -224 304 -224 288 WIRE -80 304 -80 288 WIRE 720 304 720 288 WIRE -608 336 -608 304 WIRE -256 368 -272 368 WIRE -112 368 -192 368 WIRE 64 368 64 320 WIRE 64 368 -32 368 WIRE 112 368 64 368 WIRE 288 368 288 320 WIRE 288 368 192 368 WIRE 64 384 64 368 WIRE 288 384 288 368 WIRE 720 384 720 368 WIRE 1136 400 1120 400 WIRE 1232 400 1232 368 WIRE 1232 400 1200 400 WIRE 1264 400 1232 400 WIRE 1344 400 1328 400 WIRE -272 464 -272 368 WIRE -256 464 -272 464 WIRE -176 464 -192 464 WIRE 64 464 64 448 WIRE 288 464 288 448 WIRE 1232 480 1232 400 WIRE 1232 576 1232 560 FLAG -224 304 0 FLAG -608 336 0 FLAG -80 304 0 FLAG 192 256 0 FLAG 288 464 0 FLAG 64 464 0 FLAG 720 384 0 FLAG 608 176 0 FLAG 416 176 0 FLAG 848 176 0 FLAG 1040 176 0 FLAG 1472 256 0 FLAG 1344 400 0 FLAG 1232 576 0 FLAG 1472 144 OUT FLAG 1120 400 0 FLAG -176 464 0 SYMBOL ind2 -96 304 M180 WINDOW 0 36 80 Left 2 WINDOW 3 36 40 Left 2 SYMATTR InstName L2 SYMATTR Value 30n SYMATTR Type ind SYMBOL ind2 -240 304 M180 WINDOW 0 36 80 Left 2 WINDOW 3 36 40 Left 2 SYMATTR InstName L1 SYMATTR Value 45n SYMATTR Type ind SYMBOL voltage -608 208 R0 WINDOW 3 32 82 Left 2 WINDOW 39 7 107 Left 2 SYMATTR Value ac 2 SYMATTR SpiceLine sine(0 25m 180Meg) SYMATTR InstName V1 SYMBOL tline 512 160 R0 WINDOW 0 3 -19 Bottom 2 WINDOW 3 0 21 Top 2 SYMATTR InstName T1 SYMATTR Value Td=52.5n Z0=75 SYMBOL tline 944 160 R0 WINDOW 0 3 -19 Bottom 2 WINDOW 3 0 21 Top 2 SYMATTR InstName T2 SYMATTR Value Td=52.5n Z0=75 SYMBOL res 768 128 R90 WINDOW 0 0 56 VBottom 2 WINDOW 3 32 56 VTop 2 SYMATTR InstName R6 SYMATTR Value 36 SYMBOL res 624 160 R0 SYMATTR InstName R7 SYMATTR Value 331 SYMBOL res 768 160 R0 SYMATTR InstName R8 SYMATTR Value 331 SYMBOL cap 704 304 R0 SYMATTR InstName C8 SYMATTR Value 100p SYMBOL res 1456 144 R0 WINDOW 0 38 26 Left 2 WINDOW 3 38 58 Left 2 WINDOW 123 31 84 Left 2 SYMATTR InstName Receiver SYMATTR Value 75 SYMATTR Value2 noiseless SYMBOL ind2 1216 272 M180 WINDOW 0 36 80 Left 2 WINDOW 3 36 40 Left 2 SYMATTR InstName L3 SYMATTR Value .124µ SYMATTR Type ind SYMBOL voltage 1232 464 R0 SYMATTR InstName V2 SYMATTR Value 10 SYMBOL voltage -368 192 M270 WINDOW 3 -63 56 VBottom 2 WINDOW 123 -70 55 VBottom 2 WINDOW 0 32 56 VTop 2 WINDOW 39 -35 56 VBottom 2 SYMATTR Value sine(0 25m 174Meg) SYMATTR InstName V3 SYMATTR SpiceLine Rser=75 SYMBOL npn 128 144 R0 SYMATTR InstName Q1 SYMATTR Value MRF901 SYMATTR Prefix X SYMBOL cap -112 176 R90 WINDOW 0 0 32 VBottom 2 WINDOW 3 32 32 VTop 2 SYMATTR InstName C1 SYMATTR Value 12p SYMBOL cap 32 176 R90 WINDOW 0 0 32 VBottom 2 WINDOW 3 32 32 VTop 2 SYMATTR InstName C2 SYMATTR Value 22p SYMBOL res -16 352 R90 WINDOW 0 0 56 VBottom 2 WINDOW 3 32 56 VTop 2 SYMATTR InstName R1 SYMATTR Value 499 SYMBOL res 208 352 R90 WINDOW 0 0 56 VBottom 2 WINDOW 3 32 56 VTop 2 SYMATTR InstName R3 SYMATTR Value 3.01K SYMBOL res 48 224 R0 SYMATTR InstName R2 SYMATTR Value 8.25K SYMBOL res 272 224 R0 SYMATTR InstName R4 SYMATTR Value 10K SYMBOL cap 48 384 R0 SYMATTR InstName C3 SYMATTR Value .001µ SYMBOL cap 272 384 R0 SYMATTR InstName C4 SYMATTR Value .01µ SYMBOL cap 1360 160 M270 WINDOW 0 32 32 VTop 2 WINDOW 3 0 32 VBottom 2 SYMATTR InstName C5 SYMATTR Value 22p SYMBOL res 1216 384 M180 WINDOW 0 36 76 Left 2 WINDOW 3 36 40 Left 2 SYMATTR InstName R5 SYMATTR Value 75 SYMBOL cap 1328 416 M270 WINDOW 0 32 32 VTop 2 WINDOW 3 0 32 VBottom 2 SYMATTR InstName C6 SYMATTR Value .1µ SYMBOL cap 1200 416 M270 WINDOW 0 32 32 VTop 2 WINDOW 3 0 32 VBottom 2 SYMATTR InstName C7 SYMATTR Value 15µ SYMBOL diode -192 352 R90 WINDOW 0 0 32 VBottom 2 WINDOW 3 32 32 VTop 2 SYMATTR InstName D1 SYMATTR Value 1N4148 SYMBOL diode -256 448 M90 WINDOW 0 0 32 VBottom 2 WINDOW 3 32 32 VTop 2 SYMATTR InstName D2 SYMATTR Value 1N4148 TEXT 384 456 Left 2 !.ac oct 1000 140Meg 700Meg\n \n;.noise V(out) V1 oct 1000 170Meg 700Meg\n* To plot noise figure[dB]: 10*log10(V(inoise)*V(inoise)/(4*k*300.15*75))\n \n;.tran 0 11u 1u .02n\n;.optoins plotwinsize=0\n \n;.dc temp -55 125 1 TEXT 728 96 Bottom 2 ;Noise Model of 85 feet of RG6QS TEXT -288 552 Left 2 !* Model Copyright © 1991 Analog and RF Models\n* Courtesy of wksands@earthlink.net\n* http://home.earthlink.net/~wksands\n.subckt MRF901 1 2 3\nLc 1 4 0.451n\nLb 2 6 1.759n\nLe 5 3 0.899n\nCc 4 5 0.466p\nCb 4 6 0.160p\nQ1 4 6 5 QR99\n.model QR99 NPN(BF=88 VAF=120 VAR=12 Rc=5.63 Rb=1.9 Re=.474 IKF=.021 Ise=2.7f TF=20.7p TR=1.49n\n+ ITF=.02 VTF=4.95 Cjc=.926p Cje=1.3p XTI=3 Ne=1.5 Isc=.9f Eg=1.11 PTF=23 XTB=1.5 BR=2.29 Vjc=.75\n+ Vje=.75 Is=.3f Mjc=.33 Mje=.33 XTF=4 IKR=.021 KF=1f Nc=1.7 Fc=.5 Rbm=1.35 Irb=3m XCjc=.398)\n.ends MRF901 TEXT 40 96 Bottom 2 ;Masthead VHF-high/UHF Preamp TEXT 1232 96 Bottom 2 ;Preamp Power Insertion TEXT -72 416 Top 2 ;Adjust R1\nfor 5mA\ncollector\ncurrent TEXT -472 96 Bottom 2 ;Antenna TEXT 896 664 Left 2 ;Notes: \n 1. All capacitors are surface mount.\n 2. All inductors are air wound coils.\n 3. Dashed lines in Preamp indicate shielding. TEXT 1504 96 Bottom 2 ;Television Set TEXT 496 920 Top 1 ;This example schematic is supplied for informational/educational purposes only. LINE Normal -144 96 -144 534 2 LINE Normal 0 96 0 534 2 LINE Normal 160 96 160 534 2 LINE Normal 368 288 0 288 2 RECTANGLE Normal 368 534 -288 96 2 RECTANGLE Normal 1072 416 384 96 2 RECTANGLE Normal 1376 448 1088 96 2 RECTANGLE Normal -304 368 -656 96 2 RECTANGLE Normal 1616 304 1392 96 2