Cordless telephone

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(United States)
(United States)
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Both base and handset (portable unit) used frequency modulation.
Both base and handset (portable unit) used frequency modulation.
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The second-generation of analog cordless phones were 10-channel FM units operating in the 46.61 MHz to 46.97 MHz (base stations) and 49.67 MHz to 49.99 MHz under Part 15 using the following frequencies:  
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The second-generation of analog cordless phones were 10-channel FM units operating in the 46.61 MHz to 46.97 MHz (base stations) and 49.67 MHz to 49.99 MHz under [[Part 15]] using the following frequencies:  
*Base Frequency 46.610 MHz - Handset Frequency 49.670 MHz
*Base Frequency 46.610 MHz - Handset Frequency 49.670 MHz

Revision as of 22:16, 25 April 2021

placeholder for additional info later


United States

Frequencies

Early systems used these frequencies for the base units: 1.665, 1.690, 1.695, 1.710, 1.725, 1.730, 1.750, 1.755, 1.770 MHz.

And for the handsets: 46.610, 46.630, 46.670, 46.710, 46.730, 46.770, 46.830, 46.870, 46.930, 46.970, 49.670, 49.770, 49.830, 49.845, 49.860, 49.875, 49.890, 49.930, 49.970, 49.990 MHz

Both base and handset (portable unit) used frequency modulation.

The second-generation of analog cordless phones were 10-channel FM units operating in the 46.61 MHz to 46.97 MHz (base stations) and 49.67 MHz to 49.99 MHz under Part 15 using the following frequencies:

  • Base Frequency 46.610 MHz - Handset Frequency 49.670 MHz
  • Base Frequency 46.630 MHz - Handset Frequency 49.845 MHz
  • Base Frequency 46.670 MHz - Handset Frequency 49.860 MHz
  • Base Frequency 46.710 MHz - Handset Frequency 49.770 MHz
  • Base Frequency 46.730 MHz - Handset Frequency 49.875 MHz
  • Base Frequency 46.770 MHz - Handset Frequency 49.830 MHz
  • Base Frequency 46.830 MHz - Handset Frequency 49.890 MHz
  • Base Frequency 46.870 MHz - Handset Frequency 49.930 MHz
  • Base Frequency 46.930 MHz - Handset Frequency 49.990 MHz
  • Base Frequency 46.970 MHz - Handset Frequency 49.970 MHz


The "49 MHz" cordless phones were rapidly adopted by consumers, resulting in heavy frequency congestion. The 49.830-49.890 MHz frequencies were and still are heavily used by other devices including baby monitors in continuous transmit mode. 15 frequencies were added bringing the total number of channels to 25.



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