Transmission Power Levels

When using either the internal compact F antenna or the U.FL option, channel 15 is not available as a transmitting device in FCC- or IC-regulated areas. You can use an SM220 Series to monitor radio traffic on channel 15 if the traffic is generated by devices other than an SM220 Series, but the SM220 Series will be unable to participate in message forwarding or mesh routing.

When using the U.FL external antenna in FCC- or IC-regulated areas, channel 14 has a reduced maximum transmission power at txPwr >= 6. When using the internal compact F antenna in FCC- or IC-regulated areas, channel 14 has a reduced maximum transmission power at txPwr >= 8.

Transmission power levels (in dB) in the SM220 Series modules are based on the txPwr setting and the channel. The following levels (±3dB) were read from a typical SM220 Series U.FL antenna connection using a Rhode & Schwarz NRP-Z11 Power Sensor:

txPwr Setting

Channel

0

1

2

3

4

5

6

7

8

9

10

11

12

13

14

15

16

17

0

2.9

2.9

2.9

9.1

13

15.7

17.6

18.9

19.7

19.7

19.7

19.7

19.7

19.7

19.7

19.7

19.7

19.7

1

2.9

2.9

2.9

9

12.9

15.6

17.6

18.9

19.7

19.7

19.7

19.7

19.7

19.7

19.7

19.7

19.7

19.7

2

2.9

2.9

2.9

9

12.9

15.7

17.6

18.9

19.6

19.6

19.6

19.6

19.6

19.6

19.6

19.6

19.6

19.6

3

2.9

2.9

2.9

9

12.9

15.6

17.5

18.8

19.6

19.6

19.6

19.6

19.6

19.6

19.6

19.6

19.6

19.6

4

3

3

3

9.1

12.9

15.6

17.5

18.8

19.5

19.5

19.5

19.5

19.5

19.5

19.5

19.5

19.5

19.5

5

3

3

3

9.1

13

15.6

17.5

18.7

19.4

19.4

19.4

19.4

19.4

19.4

19.4

19.4

19.4

19.4

6

3.1

3.1

3.1

9.2

13

15.7

17.5

18.7

19.4

19.4

19.4

19.4

19.4

19.4

19.4

19.4

19.4

19.4

7

3.1

3.1

3.1

9.2

13

15.7

17.5

18.7

19.4

19.4

19.4

19.4

19.4

19.4

19.4

19.4

19.4

19.4

8

3.2

3.2

3.2

9.2

13

15.7

17.5

18.6

19.3

19.3

19.3

19.3

19.3

19.3

19.3

19.3

19.3

19.3

9

3.3

3.3

3.3

9.3

13.1

15.7

17.5

18.6

19.2

19.2

19.2

19.2

19.2

19.2

19.2

19.2

19.2

19.2

10

3.3

3.3

3.3

9.3

13.1

15.7

17.4

18.5

19.2

19.2

19.2

19.2

19.2

19.2

19.2

19.2

19.2

19.2

11

3.4

3.4

3.4

9.4

13.1

15.6

17.4

18.5

19.1

19.1

19.1

19.1

19.1

19.1

19.1

19.1

19.1

19.1

12

3.4

3.4

3.4

9.4

13.1

15.6

17.3

18.4

19

19

19

19

19

19

19

19

19

19

13

3.5

3.5

3.5

9.4

13.1

15.6

17.3

18.3

18.9

18.9

18.9

18.9

18.9

18.9

18.9

18.9

18.9

18.9

14 1

3.6

3.6

3.6

9.4

13.1

15.6

17.2

17.2

17.2

17.2

17.2

17.2

17.2

17.2

17.2

17.2

17.2

17.2

14 2

3.6

3.6

3.6

9.4

13.1

15.6

17.2

18.2

18.9

18.9

18.9

18.9

18.9

18.9

18.9

18.9

18.9

18.9

Footnotes

1

Channel 14 power output values when using the U.FL antenna connection option.

2

Channel 14 power output values when using the compact F antenna built into the module.