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Table 12. Recommended Preamble Length
Mode
AFC
Antenna
Preamble Type
Recommended
Recommended
Diversity
Preamble Length
Preamble Detection
Threshold
(G)FSK
(G)FSK
(G)FSK
(G)FSK
(G)FSK
(G)FSK
4(G)FSK
4(G)FSK
Disabled
Enabled
Disabled
Enabled
Disabled
Enabled
Disabled
Enabled
Disabled
Disabled
Disabled
Enabled
Enabled
Disabled
Disabled
Standard
Standard
Non-standard
Non-standard
Standard
Standard
Standard
Standard
4 Bytes
5 Bytes
2 Bytes
7 Bytes
8 Bytes
40 symbols
48 symbols
20 bits
20 bits
0 bits
Not Supported
24 bits
24 bits
16 symbols
16 symbols
4(G)FSK
Non-standard
Not Supported
OOK
OOK
Disabled
Disabled
Disabled
Disabled
Standard
Non-standard
4 Bytes
2 Bytes
20 bits
0 bits
OOK
Enabled
Not Supported
Notes:
1. The recommended preamble length and preamble detection thresholds listed above are to achieve 0% PER. They may
be shortened when occasional packet errors are tolerable.
2. All recommended preamble lengths and detection thresholds include AGC and BCR settling times.
3. “Standard” preamble type should be set for an alternating data sequence at the max data rate (…10101010…)
4. “Non-standard” preamble type can be set for any preamble type including …10101010...
5. When preamble detection threshold = 0, sync word needs to be 3 Bytes to avoid false syncs. When only a 2 Byte sync
word is available the sync word detection can be extended by including the last preamble Byte into the RX sync word
setting.
28
Rev 1.2
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