Low-Power FM Transmitter Circuits
    Talk Hard    

Help fight the liberal media!  Build a low-power FM or TV station to cover your local community.  You can also improve your community by using the transmitters to jam Howard Stern-type broadcasts, "urban" or "rap" music stations, and any radio station which broadcasts in Spanish.

Note:  I don't own alot of these kits, I just try to collect the schematics and info.


[Broadcast Warehouse]

Broadcast Warehouse PLL+ 1 Watt FM Exciter

  1. Broadcast Warehouse PLL+ 1 Watt FM Exciter - Manual
  2. Portable Low-Power FM Broadcast Transmitter  Broadcast Warehouse-based LPFM transmitter project.
  3. Broadcast Warehouse PLL+ 1 Watt FM Exciter - Overview  Newer version of the exciter using surface-mount components.

Broadcast Warehouse LCD PLL FM Exciter

  1. Manual - Page 1  Older version, no longer available.
  2. Manual - Page 2  Parts & layout.
  3. Manual - Page 3  Schematic.  (Alternate Schematic)
  4. Broadcast Warehouse 1 Watt FM PLL Transmitter Kit Review
  5. Broadcast Warehouse 1 Watt FM LCD PLL Transmitter Kit Review
  6. Broadcast Warehouse 1 Watt FM LCD PLL Transmitter Review  by Websurf.
  7. Broadcast Warehouse Response  Tweaks for improved harmonic rejection.

Broadcast Warehouse Limiter PLUS

  1. Manual - Page 1  Overview.
  2. Manual - Page 2  Circuit description.
  3. Manual - Page 3  Assembly instructions.
  4. Manual - Page 4  Component list.
  5. Manual - Page 5  Setup, testing, and operation.
  6. Manual - Page 6  Schematic.

Broadcast Warehouse DIGILOG Stereo Encoder

  1. Manual - Page 1  Overview.  (First version)
  2. Manual - Page 2  Stereo overview.
  3. Manual - Page 3  
  4. Manual - Page 4  Circuit description.
  5. Manual - Page 5  Assembly instructions.
  6. Manual - Page 6  Component list.
  7. Manual - Page 7  Setup, testing, and operation.
  8. Manual - Page 8  
  9. Manual - Page 9  Schematic.
  10. Complete Manual  (211k PDF)

Broadcast Warehouse TX 150/300 FM Broadcast Transmitter

  1. Broadcast Warehouse TX 150/300 Transmitter Manual  Older version.  (784k PDF)
  2. Hacked Page 33  LCD schematic.  (46k PDF)
  3. Hacked Page 34  RF PA schematic.  (45k PDF)
  4. Hacked Page 35  Limiter schematic.  (52k PDF)
  5. Hacked Page 36  Stereo encoder schematic.  (44k PDF)
  6. Hacked Page 37  PLL exciter schematic.  (60k PDF)
  7. Hacked Pages 38-41  Component list.
  8. Broadcast Warehouse TX 150/300 Transmitter Manual  Newer version.  (2.8M PDF)

[Veronica Kits]

Veronica Kits 20 Watt RF Amplifier

  1. Veronica Kits 20 Watt RF Amplifier Manual
  2. Veronica Kits 20 Watt RF Amplifier Report
  3. Veronica Kits 20 Watt Amplifier Schematic  Partial.

Veronica Kits Professional Limiter/Compressor

  1. Manual - Page 1  Overview.
  2. Manual - Page 2  Component list.
  3. Manual - Page 3  Assembly instructions.
  4. Manual - Page 4  Schematic.

Veronica Kits Professional 87.5-108 MHz 1 Watt PLL FM Broadcast Transmitter

  1. Manual - Page 1  Overview.
  2. Manual - Page 2  Component list.
  3. Manual - Page 3  Assembly instructions.
  4. Manual - Page 4  DIP switch settings.
  5. Manual - Page 5  DIP switch settings.
  6. Manual - Page 6  DIP switch settings.
  7. Manual - Page 7  Schematic.
  8. Manual - Page 8  PC board layout.
  9. Veronica Kits PLL vs Ramsey FM100
  10. Veronica Kits 1 Watt PLL Component Layout  Slight error, should have the 1.8 pF (C35) cap in series with the RF output, refer to schematic
  11. More Errors on the Veronica Layout  Be sure to double check against the schematic
  12. Veronica Kits 1 Watt PLL PCB Layout  Slight error, should have the 1.8 pF cap (C35) in series with the RF output, refer to schematic

Veronica Kits 5 Watt FM Transmitter

  1. Veronica Kits 5 Watt VCO Schematic & Parts List

Panaxis Productions

Panaxis FMX PLL FM Broadcast Transmitter

  1. Manual - Page 1  Schematic.
  2. Manual - Page 2  Component list.  (TXT Version)
  3. Manual - Page 3  PC board layout.
  4. Panaxis FMX Low Audio Frequency Improvement Modification

Panaxis Macromod Audio Compressor

  1. Panaxis Macromod Audio Compressor  Full manual including schematic and part values.  (834k PDF)
  2. Panaxis Macromod Audio Compressor  Schematic.

[Free Radio Berkeley]

Free Radio Berkeley 1/2 Watt PLL Transmitter Kit

  1. Manual - Page 1  Overview.
  2. Manual - Page 2
  3. Manual - Page 3
  4. Manual - Page 4
  5. Manual - Page 5
  6. Manual - Page 6  Circuit description.
  7. Manual - Page 7  PC board layout.
  8. Manual - Page 8  Component list.  (Corrected Version)
  9. Manual - Page 9  DIP switch settings.
  10. Manual - Page 10  Chassis wiring.
  11. Free Radio Berkeley 1 Watt PLL Schematic

Other

  1. Free Radio Berkeley 15 Watt Amplifier Picture
  2. Free Radio Berkeley 1 Watt RF Amplifier Kit  Assembley instructions
  3. Free Radio Berkeley 6 Watt RF Amplifier Kit  Assembley instructions
  4. Free Radio Berkeley 20 Watt RF Amplifier Schematic
  5. Free Radio Berkeley 40 Watt RF Amplifier Schematic
  6. Free Radio Berkeley 75 Watt RF Amplifier Schematic
  7. Free Radio Berkeley Tunable Dipole Antenna
  8. Free Radio Berkeley 5/8 Ground Plane Antenna
  9. Free Radio Berkeley Slim Jim Antenna
  10. Free Radio Berkeley 7-Element Low Pass Filter

[Ramsey Electronics]

Ramsey FM10 FM Stereo Transmitter Kit

  1. Ramsey FM10 Schematic
  2. Ramsey FM10 FAQ

Ramsey FM25 Professional Synthesized FM Stereo Transmitter Kit

  1. Ramsey FM25 Schematic
  2. Another Ramsey FM25 Schematic
  3. Ramsey FM25 Component Layout
  4. Ramsey FM25 PC Board Layout
  5. Frequency Adjustment Modification for a Ramsey FM25
  6. Ramsey FM25B Bass Fix
  7. Report on the Ramsey FM25B

Ramsey FM100 Super Pro FM Stereo Radio Station Kit

  1. Ramsey FM100 Reset Fix
  2. Report on the Ramsey FM100

Other

  1. Ramsey TV6 TV Transmitter Manual & Schematic  (153k PDF)

Homebrew FM Broadcast Amplifiers

  1. Homebrew 40 Watt Amplifier for FM Broadcast  Covers the construction of Marconi's 40 watt amplifier.
  2. Schematic for a Broadband Panaxis 45 Watt Amplifier
  3. A 300 Watt Power Amplifier for the 88 to 108 MHz FM Broadcast Band  Freescale MRF6V2300N-based amplifier design by Antonio Eguizabal.  (419k PDF)
  4. Homebrew Version of the Broadcast Warehouse 150 Watt Amplifier  Uses a BLW77/SD1407.  (Mirror)
  5. Broadcast Warehouse 150 Watt Amplifier PCB Layout #1
  6. Broadcast Warehouse 150 Watt Amplifier PCB Layout #2
  7. Elenos 150 Watt Amplifier Technical Manual  With schematic  (576k PDF)
  8. Radio Shack HTA-20 Modifications for the FM Broadcast Band  (HTA-20 Schematic)  (HTA-20 PCB Layout)

Pictures & Notes from L.D. Brewer's Old Website

  1. The L.D. Brewer "Rack Enclosure"  Veronica exciter with PLL, stereo coder, and 2 limiters in L.D. Brewer rack mount enclosure.
  2. The L.D. Brewer "Rack Enclosure"  Another view.
  3. Custom L.D. Brewer LPFM Transmitter  Rack mount PLL exciter showing Veronica limiters, Veronica stereo coder, Panaxis PLL, 40 watt amp (behind RF shield).  Unit shown is configured with front panel frequency selector.
  4. Outside Picture of L.D. Brewer Rack Mount Transmitter  Rack mount PLL exciter, with front panel frequency selector and level LEDs for limiters.  Available in 1 watt, 20 watt NO-TUNE and 40 watt configuration.  Requires 13.8VDC.  Fits standard 19" rack.
  5. Free Radio Berkeley 40 Watt Amplifier Kit
  6. Free Radio Berkeley 40 Watt Amplifier Brick Enclosure
  7. Bitchin  Home Invasion by Automatic Weapon Toting Thugs Awakens Quiet Temple Terrace Neighborhood.
  8. 102.1 FM's Photo Gallery - 1  102.1 FM's air studio.
  9. 102.1 FM's Photo Gallery - 2  102.1 FM's transmitter racks.
  10. 102.1 FM's Photo Gallery - 3  102.1 FM's production studio.
  11. 102.1 FM's Photo Gallery - 4  FCC agents check out the signal level near 102.1 FM's transmitter.

Partial Mirror of Mark Weiss' FM Broadcast Projects

  1. A Circularly-Polarized Commercial-Style FM Broadcast Antenna
  2. On The Air!  A guide to setting up your own FM station.
  3. Technical Note BC-05: Broadcast Audio - Fitting the Bandwidth  A discussion on the nuances of broadcast limiting.
  4. Technical Note BC-04: Setting Modulation Levels  A highly-accurate method using oscilloscope.
  5. Technical Note BC-03: Practical Stereo Generator Adjustment Procedures
  6. Technical Note BC-02: Bandwidth of Transmitter & How It Affects Audio Performance
  7. Technical Note BC-01: Pre-Emphasis, Low-Pass Filtering & Why It's So Important
  8. Hum & Noise  Causes and cures of hum in FM transmitter installations.
  9. Mark Weiss' Pre-Emphasis Circuit
  10. Mark Weiss' 4th Generation Stereo Audio Limiter  (Value for Unmarked Resistor)
  11. Mark Weiss' Audio Compander with Noise Gate
  12. Mark Weiss' Sibilance Limiter
  13. Mark Weiss' PLL Exciter
  14. Mark Weiss' Modulation Meter
  15. 300 Watt Broadband Amplifier  Uses the Motorola MRF141G.
  16. A Simple Broadband 15-Watt Amplifier  Uses the Motorola MRF136.
  17. BA1404 Modifications from Mark Weiss

Miscellanous / Notes

Datasheets

FM Broadcast Spot Jammer

FM Broadcast Stereo Encoder

Homebrew stereo encoder for your low-power FM station.  Has been superseded by the new Forrest Cook encoder, but will remain here for informational purposes.

Links & Notes


[broadcast warehouse]