520 kHz High Pass Filter Construction
This is a recent construction of a 520 kHz high pass filter module I designed for a RF filter selector I am building as a front end for SDR. This filter can also be used in front of any other receiver as well.
The toroids I used for the 520 kHz high pass filter are all FT50 type 61 material. I am using 24 gauge magnet wire. I am using the Mini Ring Core Calculator by DL5SWB to determine the number of turns required for each inductor. You really want to measure them if possible as the toroids do have some variance in the inductance they give for a known number of turns of wire. Same goes for the capacitors. You definitely want to measure them if possible.
I use hi-q ceramic capacitors with 5% tolerance in 50 v and 100 v ratings in various brands that I ordered from Allied Electronics (http://www.alliedelec.com/). I have read hi-q caps are best for filters.
I am using FT50-61 toroid cores that I ordered from Kits & Parts (www.kitsandparts.com)
The aluminum case and circuit board are from MPJA (http://www.mpja.com/)
The student version of Elsie filter design software was used to design the filter. This can be found at www.TonneSoftware.com
