"How do I get a Hidden Fence"

FM v AM

Types of AM signals:

• Modulating Waves (AM Radio)
• Pulse Carrier
• Pulse Amplitude Modulation (PAM) Used by most manufacturers of perimeter fence.  
• Pulse-Duration Modulation (PDM) (Morse Code) Used by one manufacturer.
• Pulse-Code Modulation (PCM)
• Pulse Position Modulation (PPM)

Types of FM signals:

• Modulating Wave ( FM Radio, Police, Fire and Aircraft Communications)
• Phase Modulation – (PM)
• Frequency Speed Spectrum (Cell Phones)
• Frequency Shift Keying  (FSK; Teletype) Hidden Fence

FM ADVANTAGES

• Electrical noise sourced (televisions, computer monitors, light dimmers, motors, etc. are AM).
• FM receivers ignore AM signals.
• FM receivers can work in electrical noise environment.
• Output power remains constant with the amount of modulation.
• Less risk of receiving partial signal.
• Virtually eliminates risk of false correction from other sources.