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ARF169 Radio Modems - User guide version V1.4
2.3. Radio specifications
2.3.1 Introduction to the radio requirements
The modems use the European frequency band 169.40625-169.44375MHz. This frequency band is segmented into different sub-bands each
with their own regulatory requirements both in terms of power, spectral bandwidth, and use of the spectrum. ARF169 modems accept these
regulatory requirements.
2.3.2 Duty Cycle
LThe purpose of the Duty Cycle ratio is to make sure that no application can occupy a frequency band for more than a certain percentage of the
time. The duty cycle defines a maximum percentage of time (expressed in percentages of any period of hours during which a modem is autho-
rised to transmit. The limitation of the duty cycle should be monitored by the terminal equipment connected to the modem. Please contact Adeu-
nis RF for your calculations of your "air" occupation time.
2.3.3 ARF169 modem operating mode
ARF868 modems has one operating mode, the standard mode dedicated to very long ranges and for which immunity to jammers is optimum
The default communication mode is the standard mode. As soon as it is switched on the modem is capable of transmitting and receiving data
with the parameters in its memory (*).
By default, the modem is in permanent listening mode of the RF interface and the UART port.
•
As soon as a frame from the RF link is demodulated, its content is transmitted to the UART port
•
As soon as a character chain is detected on the UART port, it is transmitted to the RF link.
(*): On first switching on the parameters are the default parameters (or factory settings). At subsequent switchings on the parameters used are
those last memorised with the AT&W command (see § 5.2 AT Commands).
2.3.4 Standard mode
The table below presents the main RF characteristics of the ARF169 modems.
Parameters
RF data rate
Available channels
0 : 169,40625 MHz
1 : 169,41875 MHz
2 : 169,43125 MHz
3 : 169,44375 MHz
4 : 169,45625 MHz
5 : 169,46875 MHz
Available RF radiated
power
Modulation
RX sensitivity
-122dBm
Range
Up to 30km
Duty cycle
Spacing
12.5kHz*
Rejection on adjacent
channel (N-1/N+1)
Alternate channel
rejection (N-2/N+2)
Blocking
2.4kbps
9.6kbps
1 : 169,41875 MHz
3 : 169,44375 MHz
5 : 169,46875 MHz
7 levels
+27 dBm
+25 dBm
+23 dBm
+20 dBm
+17 dBm
+14 dBm
+10 dBm
2 GFSK
-116dBm
Up to 20km
1%
50kHz
46dBc
50dBc
46dBc
50dBc
>75dB
Conditions
38.4kbps
Modification through AT COMMAND ATS254
3 : 169,44375 MHz
Modification through AT COMMAND ATS200
RF power up to 27dBm (500mW)
Modification through AT COMMAND ATS231
4 GFSK
-112dBm
@BER 10e-3
Up to 12km
in open field
Depending on the use (up to 10% for AMR application)
* spectral occupancy 2.4kbps being slightly greater than
50kHz
12.5KHz, Adeunis RF advocates use N-2/N+2
39dBc
39dBc
@ +/-1 MHZ, +/-2 MHz, +/- 10 MHz
Conducted measurement
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