Smitty Working on SOMETHING: BitX-40 QRP Home Brew Radio
Channel: Mark Smith
Date: 14/06/2017

The BitX-40 is a QRP (low power) 40m (7MHz) SSB (voice, not morse code) transceiver designed and sold by Ashhar Farhan, VU2ESE.  It is a very simple-to-understand radio that you can make yourself and hack on.  It's a very good platform to learn how radios work, and to get comfortable assembling and tweaking things.

In this video, I'll explain how the radio works (and indeed how many radios work!) at the block-diagram level, assuming no prior knowledge of how RF circuits work.  The only math we'll be doing is addition and subtraction, the only electronics we'll be doing is opening and closing switches.  All other details will be hand-waved in a desire to explain the BitX 40 at a high level, allowing you to dive into more details as you desire.

Main page: http://www.hfsigs.com/
Detailed circuit: http://www.hfsigs.com/bitx40v3_circuit.html