Version 4
SHEET 1 968 804
WIRE 304 64 -16 64
WIRE 400 64 304 64
WIRE 576 64 480 64
WIRE 864 64 576 64
WIRE -16 128 -16 64
WIRE 304 128 304 64
WIRE 576 128 576 64
WIRE 864 144 864 64
WIRE -16 256 -16 208
WIRE 304 256 304 208
WIRE 576 256 576 208
WIRE 864 256 864 224
FLAG -16 256 0
FLAG 304 256 0
FLAG 576 256 0
FLAG 864 256 0
FLAG 304 64 In
FLAG 576 64 Out
SYMBOL voltage -16 112 R0
WINDOW 123 24 124 Left 2
WINDOW 39 24 152 Left 2
SYMATTR Value2 AC 2
SYMATTR SpiceLine Rser=50
SYMATTR InstName V1
SYMATTR Value ""
SYMBOL res 320 112 M0
SYMATTR InstName R1
SYMATTR Value {R1}
SYMBOL res 560 112 R0
SYMATTR InstName R3
SYMATTR Value 50
SYMBOL res 384 80 R270
WINDOW 0 32 56 VTop 2
WINDOW 3 0 56 VBottom 2
SYMATTR InstName R2
SYMATTR Value 2500
SYMBOL res 848 128 R0
SYMATTR InstName R_load
SYMATTR Value 50
TEXT -40 328 Left 2 !.ac oct 1200 100k 100meg
TEXT -40 360 Left 2 !.net I(R_Load) V1    ; for S-parameters
TEXT -24 528 Left 2 ;; Calculator: https://www.qrp4fun.de/de/s5_01.htm\n; https://www.qrp4fun.de/de/s5_02.htm
TEXT 304 416 Left 2 !.param R1 = 51.01\n.step param R1 list 57 50
TEXT 384 120 Left 2 ;; 2499.75
TEXT -24 640 Left 2 ;; for VSWR measurement paste the following formula into\n; your (global) plotdef-file:\n \n.func VSWR(rc) {(1+abs(rc))/(1-abs(rc))}
TEXT -32 -120 Left 2 ;; MFJ-264 Dummy-Load with 40 d-Attenuator\n; DB1BMN - 2019-08-05