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Building a BitX 20 Radio

The BitX 20 is a 20m band SSB transeiver originally designed in India by Ashar Frahan, and now supported and developed by by many people. My BitX is a version 3, built on a PCB ordered from Sunil Lakhani VU3SUA.

Band Pass Filter

The BitX bp-filter is simply constructed from three Toko coils and a handfull of NPO capacitors.

Bandpass filter under test

Quickly peaking up the filter response using the variable cores on the Toko coils give the following filter plots.

Bandpass response 7 - 24 Mhz
Bandpass response around 14 Mhz