26 IP920 Operating Manual: Chapter 4 Configuration
Table 9 Output Power
Power Setting
(dBm)
Approx. Output Power
(mW)
20 100
21 125
22 160
23
200
24
250
25
320
26
400
27
500
28
630
29
800
30
1000
IMPORTANT:
FCC Regulations allow up to 36 dBi effective radiated power (ERP).
Therefore, the sum of the transmitted power (in dBm), the cabling loss
and the antenna gain cannot exceed 36 dBi.
1 mW = 0 dBm
10 mW = 10 dBm
100 mW = 20 dBm
1000 mW = 30 dBm
For example, when transmitting 1 Watt (30 dBm), the antenna gain
cannot exceed 36 - 30 = 6 dBi. If an antenna with a gain higher than 6
dBi were to be used, the power setting must be adjusted appropriately.
Microhard Systems Inc. limits the MHX 920’s transmitted power to
100mW for all units purchased with antennas with gain above 6dBi.
Retransmissions: In point-to-multipoint mode, the Master will
retransmit each data packet exactly the number of times defined by the
Packet Retransmissions parameter. The remote will retransmit its packet
until the retransmission limit is reached or an acknowledgement is received.
If the limit is reached, the module will give up and discard the data.
In point-to-point mode, the Unit will only retransmit the packet if it does
not get an acknowledgement from its counterpart. In this case, the unit will
continue to retransmit until an acknowledgement is received, or the
retransmission limit is reached. When the retransmission limit is reached,
the unit discards the packet.
Recipients of the packet will discard any duplicates. The valid settings for
this parameter are 0 to 255 retransmissions.
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