!---------------------------------------------------------------- ! File names: N=Notch, 6=Band, D=Duplexer/H=Hybrid ring, 5=.5 MHz split ! 3=# of TX stubs 3=# of RX stubs, 00=serial# for generations ! ! 06-17-95 N6D53301 Add in the RG-58 COAX model. ! 05-27-95 N6D53300 Update notes ! 3 stubs in xmit leg: Shunt C= 135.0 pF ! 3 stubs in recv leg: Shunt L= 63.5 nH ! ! Title: 6-Meter Band-Reject (Notch) Duplexer ! Design: Heliax stubs interconnected with (electrical) quarter wavetength ! 50 Ohm coaxial cables. ! The Heliax used in this design is 1 5/8" (inch and five-eights). ! The physical parameters of the line have been determined such that the COAX ! statement in Touchstone Ver. 1.7 can be used specifying the inner and outer ! diameter (DI, DO), length (L), relative dielectric constant (ER), loss ! tangent (TAND) and conductor loss (RHO, relative to copper) for accurate ! modelling. DIM FREQ MHZ RES OH IND NH CAP PF LNG IN ANG DEG CKT !----- Xmt leg ----- ! Quarter wave coax line btw Rcv/Xmit junction (Ant. input) and 1st xmit stub COAX 1 2 0 0 DI=.032 DO=0.116 L=37.000 ER=2.3 TAND=.00152 RHO= 1.568 ! 1st xmit leg Stub: Composed of series cap (or approx 3" RG-8) and Heliax stub ! Series CAP to stub: series resonates with stub to create deep notch CAP 2 14 C = 8.54 ! ! The COAX line calculates it's own line losses given physical parameters COAX 14 0 0 0 DI=.625 DO=1.625 L=44.700 ER=1.335 TAND=.000132 RHO= 1.00 ! ! Trim tab capacitance, reject notch 'fine tuning' for series resonanance CAP 14 0 C= .01 ! ! Shunt CAP to gnd: antiresonates with stub/series cap to recover from atten. CAP 2 0 C = 135 ! Quarter wave coax line btw 1st and 2nd stubs COAX 2 23 0 0 DI=.032 DO=0.116 L=37.000 ER=2.3 TAND=.00152 RHO= 1.568 ! 2nd xmit leg Stub ! Series CAP to stub - series resonates with stub to create deep notch CAP 23 24 C = 8.54 COAX 24 0 0 0 DI=.625 DO=1.625 L=44.700 ER=1.335 TAND=.000132 RHO= 1.00 ! Trim tab capacitance, 'fine tunes' the notch frequency CAP 24 0 C= .01 ! Shunt CAP to gnd - antiresonates with stub/series cap to recover from atten. CAP 23 0 C = 135 ! Quarter wave coax line btw 2nd and 3rd stubs COAX 23 33 0 0 DI=.032 DO=0.116 L=37.000 ER=2.3 TAND=.00152 RHO= 1.568 ! 3rd xmit leg Stub, if used ! Series CAP to stub CAP 33 34 C = 8.54 ! Series resistor (simulates losses in network) COAX 34 0 0 0 DI=.625 DO=1.625 L=44.700 ER=1.335 TAND=.000132 RHO= 1.00 ! Trim tab capacitance CAP 34 0 C= .01 ! Shunt CAP to gnd CAP 33 0 C = 135 ! Output line from 3rd stub (need not be a quarter wavelength) TLIN 33 36 Z = 50.00000 E = 90.00000 F = 52.50000 ! n1 n2 n3 n4 DI DO L ER TAND RHO ! COAX 33 36 0 0 DI=.032 DO=0.116 L=37.000 ER=2.3 TAND=.00152 RHO= 1.568 ! Terminating resistor for Xmt leg (when needed). ! Note: If selecting Term Res 'deselect' corresponding "DEF2P" line far below. ! RES 36 0 R = 50.0 !----- Rcv leg ----- ! Quarter wave coax line btw Rcv/Xmit junction (Ant. input) and 1st recv stub ! n1 n2 n3 n4 DI DO L ER TAND RHO COAX 1 43 0 0 DI=.032 DO=0.116 L=37.000 ER=2.3 TAND=.00152 RHO= 1.568 ! 1st recv leg Stub ! Series CAP to stub CAP 43 44 C = 8.25 COAX 44 0 0 0 DI=.625 DO=1.625 L=44.400 ER=1.335 TAND=.000132 RHO= 1.00 ! Trim tab capacitance, reject notch 'fine tuning' for series resonanance CAP 44 0 C= .01 ! Shunt L to gnd IND 43 0 l = 63.5 ! Line btw 1st and 2nd stubs COAX 43 53 0 0 DI=.032 DO=0.116 L=37.000 ER=2.3 TAND=.00152 RHO= 1.568 ! 2nd recv leg Stub ! Series CAP to stub CAP 53 54 C = 8.25 COAX 54 0 0 0 DI=.625 DO=1.625 L=44.400 ER=1.335 TAND=.000132 RHO= 1.00 ! Trim tab capacitance CAP 54 0 C= .01 ! Shunt IND to gnd IND 53 0 l = 63.5 ! Line btw 2nd and 3rd stubs COAX 53 63 0 0 DI=.032 DO=0.116 L=37.000 ER=2.3 TAND=.00152 RHO= 1.568 ! 3rd recv leg Stub ! Series CAP to stub CAP 63 64 C = 8.25 COAX 64 0 0 0 DI=.625 DO=1.625 L=44.400 ER=1.335 TAND=.000132 RHO= 1.00 ! Trim tab capacitance CAP 64 0 C= .01 ! Shunt L to gnd IND 63 0 l = 63.5 ! Output line from 3rd stub (need not be a quarter wavelength) TLIN 63 3 Z = 50.00000 E = 90.00000 F = 52.50000 ! n1 n2 n3 n4 DI DO L ER TAND RHO ! COAX 63 3 0 0 DI=.032 DO=0.116 L=37.000 ER=2.3 TAND=.00152 RHO= 1.568 ! Terminating resistor for the Recv leg. ! Note: Select/deselect a corresponding "DEF2P" line below also. ! Rcv leg: deselect rcv leg "DEF2P" statement below when activating next line. RES 3 0 R = 50.0 ! Define access port pin numbers. ! Note: Choose ONLY ONE of the next two DEFP lines to view either the Rcv ! or Xmt leg responses one at a time! ! ! Rcv leg, be sure to deselect rcv leg term resistor when activating this. !DEF2P 1 3 SYN ! ! Xmt leg, be sure to deselect xmit leg term resistor when activating this. DEF2P 1 36 SYN ! Define termination resistors for System Z definition: RES 1 0 R = 50.00000 DEF1P 1 R1 RES 1 0 R = 50.00000 DEF1P 1 R2 OUT SYN DB[S21] GR1 SYN DB[S21] GR2 ! S11 or S22 are selected below. ! S11 looks into summing junction, S22 looks into Rcv or Xmt port. ! ! Rcv or Xmt ports selection is done in the code above (see last lines in ! Recv and Xmit leg definition code). ! ! SYN DB[S11] GR3 SYN DB[S22] GR3 SYN S11 SC1 ! SYN S22 SC1 FREQ SWEEP 52.00000 53.00000 0.010000 ! SWEEP 51.50000 53.50000 0.010000 GRID RANGE 52.00000 53.00000 0.100000 GR1 0.000000 -90.0000 2.000000 GR2 -0.000000 -4.0000 0.50 GR3 -0.000000 -20.0000 2.00 ! Define termination resistors (System Z): TERM SYN R1 R2