Non-Syntonic Spark-Gap Transmitter as radio jammer (illegal to turn it on, not illegal to carry one around in a backpack with the aerial disguised as a sign or flag[the pole specifically, but
VE7CNF - A Spark Gap Transmitter with a Pure Note
Shortwave spark transmitter
DIY Spark-Gap Radio Transmitter and Explanation — Steemit
Electrical Simplified: Spark-gap transmitter
Spark-gap transmitter - Wikipedia
Shortwave spark transmitter
Spark-gap transmitter - Wikipedia
Spark Transmitter & Receiver (another dirty diy trick) - Codrey Electronics
Broadband Radio Jammer : 3 Steps - Instructables
File:Inductively coupled spark gap transmitter circuit.svg - Wikimedia Commons
Spark-gap transmitter - Wikipedia
Spark-gap transmitter - Wikipedia
SPARK GAP OSCILLATOR under Repository-circuits -53756- : Next.gr
VE7CNF - A Spark Gap Transmitter with a Pure Note
SPARK GAP TRANSMITTERS
Spark Transmitter Circuit
How Spark Transmitters Work
Shortwave spark transmitter
How does a DC circuit produce radio waves? - Quora
Spark-gap transmitter - Wikipedia
How difficult would it be to construct an improvised spark gap radio transmitter from salvaged car parts using battery, coil and spark plug? - Quora
How high of a frequency can a spark gap transmitter generate? - Quora
VE7CNF - A Spark Gap Transmitter with a Pure Note
SPARK GAP TRANSMITTERS
DIY Spark-Gap Radio Transmitter and Explanation — Steemit
