cnReach N500 User Guide
System Configuration
phn-4673_003v000 (November 2018)
2-21
Note
Care must be taken to ensure enough frequencies are available for the radio to hop
within the required regulations.
In particular, under FHSS rules (less than 663 Kbps) the radio must have enough frequency bandwidth
as required under FCC rules;
–
For FHSS systems operating in the 902-928 MHz band, if the 20 dB bandwidth of the
hopping channel is less than 250 kHz, the system shall use at least 50 hopping
frequencies. The average time of occupancy on any frequency shall not be greater than
0.4 seconds within a 20 second period.
–
If the 20 dB bandwidth of the hopping channel is 250 kHz or greater, the system shall
use at least 25 hopping frequencies and the average time of occupancy on any
frequency shall not be greater than 0.4 seconds within a 10 second period.
–
The maximum allowed 20 dB bandwidth of the hopping channel is 500 kHz.
–
Under DTS rules (greater than or equal to 663kbps) there is no limit on the minimum
bandwidth for the Radio as it may operate on one frequency, therefore the lower and
upper edge of the band may be reduced if the full 902 to 928MHz ISM range is not
required.
–
ISM start/stop frequency: These parameters specify the beginning and end of the RF
band allocated for hopping.
–
ISM exclude frequency: These parameters specify the beginning and end of an
excluded band within the band specified by “ISM start/stop frequency”. If an excluded
band is specified, the hop pattern avoids hopping with the excluded band.
Single Frequency?
o
When selected, the radio will operate on a single frequency (tx and rx)
Hop Pattern
A Hop Pattern of 0 fixes the frequency to a single channel (DTS Modulations ONLY).
A Hop Pattern of 1 creates a pseudo random hopping sequence through the available channels.
A Hop Pattern of 2 - 9 is a uniform step through the defined channels as follows:
2: Every other available channel
3: Every 3
rd
available channel
4: Every 4
th
available channel
And so on.
For FHSS (less than 633kbps) the Hop Pattern should be set to 1.
For DTS (633kbps and above) the Hop Pattern may be set anywhere from 0 – 9.
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