Receive Sensitivity and Transmit Power Index-Value Table

When configuring the reader's Receive Sensitivity and Transmit Power setting in LLRP, such as in the Octane LTK, you'll need to input an index in the code, rather than a literal settings value. This article lets you quickly look up the correct index for the desired settings value.

For more information about setting Receive Sensitivity and Transmit Power on Impinj readers using LLRP, please click here.

Receive Sensitivity

The ReceiveSensitivityValue is the offset in dB that the reader will implement from its lowest (i.e. most sensitive) receive sensitivity to filter out tag reads if their RSSI is too low. The ReceiveSensitivityValue is 0 (= Index 1) by default, which means that the reader is at its lowest receive sensitivity and will not filter out tag reads.

Impinj Speedway R420/R220 RAIN RFID readers

Index ReceiveSensitivityValue Receive Sensitivity (dBm)
1 0 -80
2 10 -70
3 11 -69
4 12 -68
5 13 -67
6 14 -66
7 15 -65
8 16 -64
9 17 -63
10 18 -62
11 19 -61
12 20 -60
13 21 -59
14 22 -58
15 23 -57
16 24 -56
17 25 -55
18 26 -54
19 27 -53
20 28 -52
21 29 -51
22 30 -50
23 31 -49
24 32 -48
25 33 -47
26 34 -46
27 35 -45
28 36 -44
29 37 -43
30 38 -42
31 39 -41
32 40 -40
33 41 -39
34 42 -38
35 43 -37
36 44 -36
37 45 -35
38 46 -34
39 47 -33
40 48 -32
41 49 -31
42 50 -30

 

Impinj R700 RAIN RFID readers

Index ReceiveSensitivityValue Receive Sensitivity (dBm)
1 0 -90
2 10 -80
3 11 -79
4 12 -78
5 13 -77
6 14 -76
7 15 -75
8 16 -74
9 17 -73
10 18 -72
11 19 -71
12 20 -70
13 21 -69
14 22 -68
15 23 -67
16 24 -66
17 25 -65
18 26 -64
19 27 -63
20 28 -62
21 29 -61
22 30 -60
23 31 -59
24 32 -58
25 33 -57
26 34 -56
27 35 -55
28 36 -54
29 37 -53
30 38 -52
31 39 -51
32 40 -50
33 41 -49
34 42 -48
35 43 -47
36 44 -46
37 45 -45
38 46 -44
39 47 -43
40 48 -42
41 49 -41
42 50 -40
43 51 -39
44 52 -38
45 53 -37
46 54 -36
47 55 -35
48 56 -34
49 57 -33
50 58 -32
51 59 -31
52 60 -30

 

Transmit Power

The table below shows all the possible indexes including both the Impinj Speedway and Impinj R700 readers for the Transmit Power settings values. Each Index is associated with a particular TransmitPowerValue on the reader. You can see this by running the following RShell command:

> show rfid llrp capabilities

If you divide TransmitPowerValue by 100, you get the actual transmit power in dBm.

You will need to ensure you are complying with the local RFID regulations for the maximum allowed Transmit Power.

Index TransmitPowerValue Transmit Power (dBm)
1 1000 10.00
2 1025 10.25
3 1050 10.50
4 1075 10.75
5 1100 11.00
6 1125 11.25
7 1150 11.50
8 1175 11.75
9 1200 12.00
10 1225 12.25
11 1250 12.50
12 1275 12.75
13 1300 13.00
14 1325 13.25
15 1350 13.50
16 1375 13.75
17 1400 14.00
18 1425 14.25
19 1450 14.50
20 1475 14.75
21 1500 15.00
22 1525 15.25
23 1550 15.50
24 1575 15.75
25 1600 16.00
26 1625 16.25
27 1650 16.50
28 1675 16.75
29 1700 17.00
30 1725 17.25
31 1750 17.50
32 1775 17.75
33 1800 18.00
34 1825 18.25
35 1850 18.50
36 1875 18.75
37 1900 19.00
38 1925 19.25
39 1950 19.50
40 1975 19.75
41 2000 20.00
42 2025 20.25
43 2050 20.50
44 2075 20.75
45 2100 21.00
46 2125 21.25
47 2150 21.50
48 2175 21.75
49 2200 22.00
50 2225 22.25
51 2250 22.50
52 2275 22.75
53 2300 23.00
54 2325 23.25
55 2350 23.50
56 2375 23.75
57 2400 24.00
58 2425 24.25
59 2450 24.50
60 2475 24.75
61 2500 25.00
62 2525 25.25
63 2550 25.50
64 2575 25.75
65 2600 26.00
66 2625 26.25
67 2650 26.50
68 2675 26.75
69 2700 27.00
70 2725 27.25
71 2750 27.50
72 2775 27.75
73 2800 28.00
74 2825 28.25
75 2850 28.50
76 2875 28.75
77 2900 29.00
78 2925 29.25
79 2950 29.50
80 2975 29.75
81 3000 30.00
82 3025 30.25
83 3050 30.50
84 3075 30.75
85 3100 31.00
86 3125 31.25
87 3150 31.50
88 3175 31.75
89 3200 32.00
90 3225 32.25
91 3250 32.50
92 3275 32.75
93 3300 33.00

 

 

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