RFDesign RFD868x - 5 Region Certified Modems; 5.1 Frequency band example

Point-to-Point/SIK Firmware User Manual
www.rfdesign.com.au
16
Last update 17/12/2020
5 Region Certified Modems
A modem restricted to regional certified settings will be set at the factory. The country setting cannot
be modified or removed after the modem release. By the same token an unlocked modem cannot be
set with country compliance after the modem release. Modems with country settings cannot be
loaded with all firmware versions including some prior to the SiK versions. Unlocked modems can be
loaded with all firmware version. Any 900x modems sold before the release of certified modems
operate as an unlocked modem.
5.1 Frequency band example
FCC-compliant radios, designated as RFD900x-US, are allowed to operate in two different frequency
bands. The user might operate two pairs of radio simultaneously without them interfering with each
other – given a minimal physical distance between the radios is respected – while remaining FCC-
compliant by setting each pair to a different frequency band. This can be achieved by setting the S23
parameter according to the table below.
S23 value
Description
Minimum
frequency
Maximum
Frequency
Number of
channels
0
Lower frequency band
902.125 MHz
914.875 MHz
51
1
Upper frequency band
915.125 MHz
927.875 MHz
51
When operating multiple sets of modems with frequency separation, e.g. upper and lower bands,
physical separation is required between modems to minimise interference. Users must ensure the
power output setting and antenna configuration are suitable for their application prior to
deployment.
Airspeed on FCC-compliant radios are limited to 12, 64, 125 and 224kbps as to meet FCC
requirements. The airspeed is still set using the S1 parameter.