Homebrew 80/40m SSB/CW Rig - #4a SSB Crystal Filter
10:59
Homebrew 80/40m SSB/CW Rig - #4b CW Crystal Filter
31:28
17 - Crystal Filters for the Fearful
28:53
#617 How to Design a Crystal Filter
49:03
Apollo Core Rope Memory (Apollo Guidance Computer Part 30)
12:05
#339: Basics of a Super-heterodyne Receiver - how it works, and a peek at the signals
15:51
Homebrew 80m/40m SSB/CW Rig - Part 5: Crystal Filters
18:05
Homebrew 80/40m SSB/CW Rig - #9b RF Power Amplifier Experiments
13:16