0
1
00:00:00,870 --> 00:00:01,250
Hey.
1

2
00:00:01,260 --> 00:00:02,880
I'm so happy you're still here.
2

3
00:00:03,300 --> 00:00:04,650
We finished a new chapter.
3

4
00:00:04,800 --> 00:00:06,750
So let's recap what we've learned in this one.
4

5
00:00:07,500 --> 00:00:11,370
First, Decibel is a unit that has to represent a ratio and power.
5

6
00:00:11,940 --> 00:00:15,060
It prevents to use very small or very large values.
6

7
00:00:15,540 --> 00:00:20,520
And it transforms multiplications into sums and divisions into subtractions.
7

8
00:00:21,450 --> 00:00:28,890
The RSSI is the received power, and if the RSSI is above the receiver sensitivity, the transmission
8

9
00:00:28,890 --> 00:00:29,640
is successful.
9

10
00:00:31,020 --> 00:00:35,910
Next, we saw that the SNR is the ratio between the signal under noise.
10

11
00:00:36,540 --> 00:00:42,510
The Link Budget evaluates the potential of the transmission and we saw Real Link Budget Values for two different
11

12
00:00:42,510 --> 00:00:43,410
lower transceiver.
12

13
00:00:43,920 --> 00:00:49,320
And finally, when digging into the documentation, we found out that changing the spreading factor
13

14
00:00:49,320 --> 00:00:51,750
hold your chance to reception capacities.
14

15
00:00:52,080 --> 00:00:58,320
We spoke about being able of receiving a signal drawn in a noise 100 times stronger than the signal itself.
15

16
00:00:59,310 --> 00:01:03,000
But changing the spreading factor has also an influence on the bitrate.
16

17
00:01:03,210 --> 00:01:05,580
And that's what we're going to see in the next chapter.