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Increasing range for low power AM transmitters

Our Low Power Radio mailbag often gets questions about increasing range for AM transmitters. "How can I broadcast farther?" "What's the best way to increase my range?" "Can I get 1/2 mile of coverage?"
     Like any honest answer in technology, the only accurate response is "it depends..."
     In the case of low power AM broadcasting, it generally depends on three things:
  1. Antenna matching coil
  2. Transmitter radio frequency (RF) ground
  3. Carrier modulation
Over the next few weeks, I'll be pulling together our many posts and links on these topics into three focused summaries to review strategies for increasing range in each of these three areas. First up, antenna matching coils.

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