2.12 Install Low Pass Filter toroids
80 / 60 / 40 / 30 / 20m version: Now we’ll wind and install the six Low Pass Filter toroids using
0.33mm (AWG #28) enameled wire. Remember, as per the previous direction, using the right
winding direction will make the toroids much easier to fit to the PCB. Refer to the table below.
Make sure to count carefully and install the toroids in the correct places! Remember that each time
the wire passes through the center of the toroid counts as one turn. Spread the turns evenly with a
small gap.
Winding the toroids as tightly as possible will slightly improve the performance of the Low Pass
Filters. But don’t pull so tightly that you break the wire!
The following table lists the required number of turns, cut wire length, and inductance.
Band Part number Core Inductance Number of turns Wire length
80m L511 T30-6 (YELLOW) 2.40uH 26 37cm
80m L506 T30-6 (YELLOW) 2.88uH 28 40cm
60 / 40m L512 T30-6 (YELLOW) 1.06uH 17 26cm
60 / 40m L508 T30-6 (YELLOW) 1.20uH 18 27cm
30m/20m L513 T30-6 (YELLOW) 393nH 10 18cm
30m/20m L510 T30-6 (YELLOW) 525nH 12 20cm
QMX assembly Rev 1.00e 36
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