John Sloan:
DTMF 1 Spectrum (DC Coupled)
John Sloan:
DTMF 2 Spectrum (DC Coupled)
John Sloan:
DTMF 3 Spectrum (DC Coupled)
John Sloan:
DTMF 4 Spectrum (DC Coupled)
John Sloan:
DTMF 6 Spectrum (DC Coupled)
John Sloan:
DTMF 5 Spectrum (DC Coupled)
John Sloan:
DTMF 7 Spectrum (DC Coupled)
John Sloan:
DTMF 8 Spectrum (DC Coupled)
John Sloan:
DTMF 9 Spectrum (DC Coupled)
John Sloan:
DTMF 0 Spectrum (DC Coupled)
John Sloan:
DTMF Ast Spectrum (DC Coupled)
John Sloan:
DTMF 0 Waveform (DC Coupled)
John Sloan:
DTMF Oct Spectrum (DC Coupled)
John Sloan:
System Under Test (Close Up)
John Sloan:
Spectrum Analysis of Radio Shack Pocket Tone DIaler
John Sloan:
System Under Test
John Sloan:
Oscilloscope Attached to Speaker Wires
John Sloan:
Logic Clips Attached to Speaker Wires
John Sloan:
Radio Shack Pocket Tone Dialer (Inside)
John Sloan:
Radio Shack Pocket Tone Dialer (Front)
John Sloan:
Radio Shack Pocket Tone Dialer (Back)
John Sloan:
DTMF 1 Spectrum (AC Coupled)
John Sloan:
DTMF 2 Spectrum (AC Coupled)
John Sloan:
DTMF 4 Spectrum (AC Coupled)
John Sloan:
DTMF 3 Spectrum (AC Coupled)
John Sloan:
DTMF 5 Spectrum (AC Coupled)
John Sloan:
DTMF 6 Spectrum (AC Coupled)
John Sloan:
DTMF 7 Spectrum (AC Coupled)
John Sloan:
DTMF 9 Spectrum (AC Coupled)
John Sloan:
DTMF 8 Spectrum (AC Coupled)
