Cordless Phone Frequencies

Cordless phones, also known as cordless telephones or portable telephones, are a smarter replacement for the regular telephones. Cordless phones make use of wireless radio waves to connect to their base station equipments, unlike the wired cord of a regular telephone.

Because cordless handsets use radio linking with their base stations, they operate within specific ranges of frequencies. The range of connectivity is quite limited – maybe inside the house or to few adjacent floors. The base station requires power supply to charge the internally fitted rechargeable battery.

The term frequency refers to the rate at which an electromagnetic wave oscillates. Therefore, most cordless phone models are allotted specific range of frequencies within which they operate. A cordless handset and and a base station communicates with each other using this frequency.

Here are the frequencies for the first generation 46/49MHz cordless phones.

Channel	Handset Frequency	Base Frequency
1	49.670	46.610
2	49.845	46.630
3	49.860	46.670
4	49.770	46.710
5	49.875	46.730
6	49.830	46.770
7	49.890	46.830
8	49.930	46.870
9	49.990	46.930
10	49.970	46.970

900MHz Cordless Phone Frequencies

Second generation 900MHz cordless phones have been allocated the frequencies between 902 and 928MHz, with channel spacing between 30-100KHz.

The following are some examples of the frequencies that example cordless phones use:

Panasonic KX-T9000 (60 Channels) Base Frequency: 902.100 – 903.870 Handset Frequency: 926.100 – 927.870

Channel	Base Frequency	Handset Frequency	Channel	Base Frequency	Handset Frequency
01	902.100	926.100	31	903.000	927.000
02	902.130	926.130	32	903.030	927.030
03	902.160	926.160	33	903.060	927.060
04	902.190	926.190	34	903.090	927.090
05	902.220	926.220	35	903.120	927.120
06	902.250	926.250	36	903.150	927.150
07	902.280	926.280	37	903.180	927.180
08	902.310	926.310	38	903.210	927.210
09	902.340	926.340	39	903.240	927.240
10	902.370	926.370	40	903.270	927.270
11	902.400	926.400	41	903.300	927.300
12	902.430	926.430	42	903.330	927.330
13	902.460	926.460	43	903.360	927.360
14	902.490	926.490	44	903.390	927.390
15	902.520	926.520	45	903.420	927.420
16	902.550	926.550	46	903.450	927.450
17	902.580	926.580	47	903.480	927.480
18	902.610	926.610	48	903.510	927.510
19	902.640	926.640	49	903.540	927.540
20	902.670	926.670	50	903.570	927.570
21	902.700	926.700	51	903.600	927.600
22	902.730	926.730	52	903.630	927.630
23	902.760	926.760	53	903.660	927.660
24	902.790	926.790	54	903.690	927.690
25	902.820	926.820	55	903.720	927.720
26	902.850	926.850	56	903.750	927.750
27	902.880	926.880	57	903.780	927.780
28	902.910	926.910	58	903.810	927.810
29	902.940	926.940	59	903.840	927.840
30	902.970	926.970	60	903.870	927.870

GE model 26938GE1-C

Channel	Base Frequency	Handset Frequency	Channel	Base Frequency	Handset Frequency
01	923.7	925.9	21	924.7	926.9
02	923.8	925.95	22	924.75	926.95
03	923.8	926.0	23	924.8	927.0
04	923.85	926.05	24	924.85	927.05
05	923.9	926.1	25	924.9	927.1
06	923.95	926.15	26	924.95	927.15
07	924.0	926.2	27	925.0	927.2
08	924.05	926.25	28	925.05	927.25
09	924.1	926.4	29	925.1	927.3
10	924.15	926.35	30	925.15	927.35
11	924.2	926.4	31	925.2	927.4
12	924.25	926.45	32	925.25	927.45
13	924.3	926.5	33	925.3	927.5
14	924.35	926.55	34	925.35	927.55
15	924.4	926.6	35	925.4	927.6
16	924.45	926.65	36	925.45	927.65
17	924.5	926.7	37	925.5	927.7
18	924.55	926.75	38	925.55	927.75
19	924.6	926.8	39	925.6	927.8
20	924.65	926.85	40	925.65	927.85

V-Tech Tropez DX900 (20 Channels)

Base Frequency: 905.6 – 907.5 (100Khz spacing), Handset Frequency: 925.5 – 927.4

Channel	Base Frequency	Handset Frequency	Channel	Base Frequency	Handset Frequency
01	905.600	925.500	11	906.600	926.500
02	905.700	925.600	12	906.700	926.600
03	905.800	925.700	13	906.800	926.700
04	905.900	925.800	14	906.900	926.800
05	906.000	925.900	15	907.000	926.900
06	906.100	926.000	16	907.100	927.000
07	906.200	926.100	17	907.200	927.100
08	906.300	926.200	18	907.300	927.200
09	906.400	926.300	19	907.400	927.300
10	906.500	926.400	20	907.500	927.400

Other 900MHz cordless phones:

AT&T #9120	902.0 – 905.0 & 925.0 – 928.0 MHz
Otron Corp. #CP-1000	902.1 – 903.9 & 926.1 – 927.9 MHz
Samsung #SP-R912	903.0 & 927.0 MHz

2.4GHz Cordless Phone Frequencies

Third generation 2.4GHz cordless phones have been allocated the frequencies between 2.4Ghz and 2.4835Ghz, with a channel spacing of 5MHz.

The 2.4GHz cordless phone frequencies are shared with 802.11b and 802.11g wireless networks.

5.8GHz Cordless Phone Frequencies

Fourth generation 5.8GHz cordless phones have been allocated the frequencies between 5.725Ghz and 5.850Ghz.

It is important to note that some 5.8GHz cordless phones use the 5.8Ghz frequencies only for base-to-handset transmissions, while still using the 2.4Ghz frequencies for handset to base transmissions.

This split frequency technique saves battery life on the cordless phone handset because it requires more power to transmit at the higher 5.8GHz frequency than at the lower 2.4Ghz frequency.

The 5.8GHz cordless phone frequencies are shared with 802.11a wireless networks.