MFJ MFJ-8504, Инструкция по эксплуатации

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Band Pass Filter
The MFJ-8504-BP is a blank board for use by the customer to produce custom band pass filters such as
a single Ham Band to limit out of band signals and possible overload. The board consists of a 5-pole low
pass filter to set the upper limit of signals and a 5-pole high pass filter to set the lower limit of signals.
Programs such as Elsie from Tonne Software (
www.tonnesoftware.com ) or other on line sources make
calculating the filter values easy. Verification of the filter can be plotted through spice programs such as
LT Spice (
https://www.analog.com/en/design-center/design-tools-and-calculators/ltspice-simulator.html ).
The inductors used are approximately the size of 1/4W resistors and are available from multiple sources.
These should be 5% tolerance.
The capacitors used should be 5% NPO or COG type capacitors for minimum drift and with a lead
spacing around 0.1 or 0.2 inch. Voltage is not critical.
Suggested parts values for individual Amateur Bands:
Low Pass High Pass
BAND Freq LP L1 C1 L2 C2 L3 FREQ HP C3 L4 C4 L5 C5
160 2 6.8uH 2000pF 10uH 2000pF 6.8uH 1.75 1100pF 3.6uH 750pF 3.6uH 1100pF
80 4.5 3.3uH 1000pF 4.7uH 1000pF 3.3uH 3 560pF 2uH 390pF 2uH 560pF
60 5.8 2.4uH 680pF 3.6uH 680pF 2.4uH 5 360pF 1.3uH 240pF 1.3uH 360pF
40 7.7 1.8uH 510pF 2.7uH 510pF 1.8uH 6.5 300pF 1uH 220pF 1uH 300pF
30 10.7 1.3uH 360pF 1.8uH 360pF 1.3uH 9.5 200pF 0.68uH 130pF 0.68uH 200pF
20 15 0.91uH 240pF 1.3uH 240pF 0.91uH 13 150pF 0.51uH 100pF 0.51uH 150pF
17 19 0.75uH 200pF 1.1uH 200pF 0.75uH 17 110pF 0.39uH 75pF 0.39uH 110pF
15 22.5 0.62uH 180pF 0.91uH 180pF 0.62uH 20 91pF 0.33uH 62pF 0.33uH 91pF
12 26 0.51uH 150pF 0.75uH 150pF 0.51uH 24 75pF 0.27uH 51pF 0.27uH 75pF
10 31 0.43uH 130pF 0.68uH 130pF 0.43uH 27 68pF 0.24uH 47pF 0.24uH 68pF
6 57 0.24uH 68pF 0.36uH 68pF 0.24uH 48 39pF 0.13uH 27pF 0.13uH 39pF