bitx20 v3 build – if amps & crystal filter

Moving along the schematic, the next step in my bitx build is the crystal filter and the post mixer if amps.


I tested all of the 10MHz crystals that I had and picked the four that were closest in value and put them together on a small board. I wanted to keep the filter on its own board and “separated” from the rest of the circuit so I could switch it out if I decided to switch bands later on.



Next were the post mixer if amps. They are similar to the rest of the amps in the circuit so they went together fairly easily.