Barrage (noise) jammer for VHF/UHF communications.  Based around an old TV tuner with its local oscillator tapped and amplified.  The tuner's voltage tune line is mixed with a sweeping, random noise signal.

Also below schematic is my attempt at the Racal JAMCAT, with only the white noise option.

Schematics

• Tactical Communications Jammer Schematic  (30k PostScript)
• Tactical Communications Jammer Schematic  (85k PNG)
• Co-Channel Jammer Controller Schematic  (26k PostScript)
• Co-Channel Jammer Controller Schematic  (50k PNG)

Pictures

• Tactical Communications Jammer

Ronen's Tuner

• Tuner info
• RF/power connections
• Close up of the local oscillator tap
• Testbench setup
• Spectrum analyzer plot, 745.6 MHz @ -43.96 dBm