JJJelectronics- Low Pass Filter (LPF)

*50R input and output impedance

Band 1: 160m Or Band 1: 80m Or Band 1: 40m Or Band 1: 20m/17m Or. Band 1: 15m/10m

Tool required.Soldering iron (25w-40w), small cutter

Now let’s build the LPF

When you have finished assembly of the board, check all the parts are in the right places.The soldering looks bright and good. Re-solder any suspect joints with a little fresh solder, check that there are no short or splashes of solder between tracks.

First wind the toroidsUse the table below for your band and wind the toroids with the right number of turnsuse thick wire (included), Passing the wire through the hole and then back out, counts as one turn

When you finished all toroids solder them and solder the capacitos

band C2 C1/ middle C3 L1, L2 /turns160m 1.5nf 2.7nf 1.5nf 2780m 1nf 1.5nf 1nf 2140m 470pf 1nf 470pf 1520m/17m 180pf 330pf 180pf 1115m/10m 100pf 180pf 100pf 8