ZachTek WSPR TX Mini Build Instruction page 5

The inductors are three and the two outer ones have the same value.
In other words - L1 and L3 have the same value.
L2 is a larger value so you can use a similar mental memory guide for the inductor size, - The Higher value
Inductor goes in the center
The value of the inductors can also be found in the "SMD low pass filter table" in the appendix.
So if we for example are doing a 20m filter the L1 and L3 are 773nano Henrys and L2 in the center is 904nano
Henry.
Enough with the theory, time to warm up the soldering iron and create some solder smoke!
Document version 1.1 Page | 5