ikeating.github.io/01_11_2024.html at master · ikeating/ikeating.github.io · GitHub

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
<!-- <center><img src="/Seattle_2024/IMG_1513.jpeg" alt="Seattle_2024/IMG_1513.jpeg" width="300" height="400"></center> -->

<!-- <a href="https://address.com">Label</a> -->

<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>01/11/2024</title>
    <style>
        body {
            font-family: Arial, sans-serif;
            margin: 40px;
            background-color: #f4f4f4;
            color: #333;
            line-height: 1.6;
        }

        h1, h2 {
            color: #2c3e50;
        }

        img {
            max-width: 100%;
            height: auto;
            display: block;
            margin: 10px 0;
        }

        .container {
            max-width: 800px;
            margin: 0 auto;
            background: #fff;
            padding: 20px;
            box-shadow: 0 0 10px rgba(0, 0, 0, 0.1);
        }

        p {
            margin: 10px 0;
        }

        a {
            color: #3498db;
            text-decoration: none;
        }

        a:hover {
            text-decoration: underline;
        }
    </style>
</head>

<body>
    <div class="container">

        Back to <a href="index">Homepage</a>

        <h1>iBlog</h1>

        <h2>01/11/2024</h2>
        <p>11-01-2024 LoRa notes (open for editing)<br><br>

    Radio transceivers have always sparked my interest.  Many years ago, I obtained my amateur radio license, and then more recently became interested in programming micro controllers and single board computers.  I discovered Adafruit Feather boards that contained LoRa transceivers within the ham radio spectrum of 70cm.  Thus began my journey into the topic of LoRa.<br><br>
        LoRa stands for ‘long range’ and is a low power communications protocol.  Frequency Shift (Compressed High Intensity Radar Pulse (CHIRP) ) Modulation (FSCM)<br><br>
Open System Interconnection (OSI) Reference Model<br>
7)  Application<br>
6)  Presentation<br>
5)  Session<br>
4)  Transport<br>
3)  Network<br>
2)  Data Link<br>
1)  Physical    --  LoRa<br><br>

Based wireless networking standard<br>
SF = Spreading Factor (7 – 12)<br><br>

LoRa Frame<br>
Preamble is at start of every frame (repeated and known as the base chirp)<br><br>

Packet<br>
-------------------------------------------------------------------------------------------------<br>
LoRa Physical Layer<br>
--------------------------------------------------------------------------------------------------<br>
Preamble    Sync message    Payload CRC (only in uplink)<br>
8 symbols   2 symbols<br>
---------------------------------------------------------------------------------------------------<br><br>
</p>

        <p>End of blog. Thank you for reading!</p>

        Back to <a href="index">Homepage</a><br><br>

        © 2024. This work by Isaiah Keating is openly licensed via <a href="https://creativecommons.org/licenses/by-sa/4.0/">CC BY-SA 4.0</a>
    </div>
</body>

</html>