SID Monitor BandPass Filter
Tuning Resistors (from Maxim 275 design notes)
R2 = 2x10^9 / Frequency Where: 
R4= R2 - 5000 Q = 170 (default)
R3 = (Q) (2x10^9) (Rx)/ (F0*Ry) Rx/Ry = 1/25 ( for 5k< R2,R3 < 4M)
R1 = R3 / BP_gain BP_gain = 2.5 (default)
VLF Stations ID Freq KHz R2 R4 R3 R1
             
Cutler, ME NAA 24 83333 78333 566667 226667
Jim Creek,WA NLK 24.8 80645 75645 548387 219355
Lualuelei,HI NPM 21.4 93458 88458 635514 254206
La Moure, ND NML 25.2 79365 74365 539683 215873
Aquada, Puerto Rico NAU 40.75 49080 44080 333742 133497
South Pole VLF 20 100000 95000 680000 272000
NW Cape NWC 19.8 101010 96010 686869 274747
Changde 3SA 20.6 97087 92087 660194 264078
Datonge 3SB 10.6 188679 183679 1283019 513208
Rhauderfehn DHO 23.4 85470 80470 581197 232479
Rosnay HWU 20.9 95694 90694 650718 260287
St. Assie FTA 16.8 119048 114048 809524 323810
LeBlanc HWV 21.75 91954 86954 625287 250115
Keflavik NRK 37.5 53333 48333 362667 145067
Katabomman VTX3 18.2 109890 104890 747253 298901
Tavolara ICV 20.27 98668 93668 670942 268377
Sicily NSC 45.9 43573 38573 296296 118519
Ebino JJI 22.2 90090 85090 612613 245045
Kolsas JXN 16.4 121951 116951 829268 331707
Arkhanghelsk UGE 19.7 101523 96523 690355 276142
Batumi UVA 14.6 136986 131986 931507 372603
Kaliningrad UGKZ 30.3 66007 61007 448845 179538
Matotchkinchar UFQE 18.1 110497 105497 751381 300552
Vladivostock UIK 15 133333 128333 906667 362667
Bafa TBB 26.7 74906 69906 509363 203745
Anthorn GBZ 19.6 102041 97041 693878 277551
Anthorn GQD 22.1 90498 85498 615385 246154
London GYA 21.37 93589 88589 636406 254562