Radiocrafts
Embedded Wireless Solutions
RC1240/1280/1290
©2011 Radiocrafts AS RC1240/RC1280/RC1290 Data Sheet (rev. 1.62) Page 14 of 26
bytes for addressing and 2 extra bytes for CRC if enabled.
Note also that in IDLE mode every 13.6 seconds the module recalibrates its internal UART
clock reference in order to compensate for temperature drift. The recalibration takes
approximately 5 ms. There is no recalibration in CONFIG mode, therefore the module should
not be left in CONFIG mode for an extended time if the temperature is likely to change by
more than +/- 5 degrees.
RF Frequency, Output Power Levels and Data Rates
The following table shows the available RF channels and their corresponding frequencies,
nominal output power levels and available data rates.
Model RF channel Output power Data rate
RC1240
1-69:
f
RF
=433.0775+(N-1)*0.025 MHz
where N is the channel number
Factory setting: 54: 434.4025 MHz
1: -14 dBm
2: -6 dBm
3: 0 dBm
4: 5 dBm
5: 8 dBm
4.8 kbit/s fixed
RC1280
1-80:
f
RF
=868.0125+(N-1)*0.025 MHz
where N is the channel number
Factory setting: 41: 869.0125 MHz
1: -15 dBm
2: -10 dBm
3: -5 dBm
4: 0 dBm
5: 3 dBm
4.8 kbit/s fixed
RC1290
1-51:
f
RF
=902.5+(N-1)*0.5 MHz
where N is the channel number
(except channel 47: 925.6 MHz)
Factory setting: 26: 915.0000 MHz
1: -15 dBm
2: -10 dBm
3: -5 dBm
4: -1 dBm
5: 2 dBm
1: NA
2: NA
3: 4.8 kbit/s
4: 9.6 kbit/s
5: 19.2 kbit/s
RF channel and output power level can be set using the configuration commands ‘C’ and ‘P’
respectively. The data rate can only be changed in configuration memory by using the ‘M’
command setting RF_DATA_RATE. The default RF channel and output power level can be
set in the configuration memory by using the ‘M’ command setting RF_CHANNEL and
RF_POWER. The default values are used after power ON and RESET. The default factory
settings are shown in bold in the table above.
For more details on changing the RF channel, output power or data rate, refer to the RC232™
User Manual describing the configuration commands.
The use of RF frequencies and maximum allowed RF power is limited by national regulations.
The RC1240 and RC1280 are complying with the applicable directives within the European
Union. The RC1290 is certified FCC/IC for use in the US and Canada. For more information
see section Regulatory Compliance Information page 21.
External PA and LNA control
Pin 23 and 24 can be used to control an external Power Amplifier (PA), external Low Noise
Amplifier (LNA) and Transmit/Receive (T/R) switch. The control signals are active high logic
level (VDD) digital outputs. The PA_EN signal is active while the internal PA is on, while
LNA_EN is active when the internal LNA is on. The PA is on during transmit mode, the LNA is
on during receive mode and idle mode.
