Архив за 31.12.2017

How to calculate baudrate?

I'm going through this article https://www.elttam.com.au/blog/intro-sdr-and-rf-analysis/ and I find it hard to understand the following part:

However, in our case we might want to transmit this signal later and need to represent each symbol with 1’s and 0’s, for instance the short pulse symbol may be represented by 0001. For this, we will measure the shortest pulse or gap that appears. Using the shortest pulse, we get a baud of 2960.

How did he calculate this 2960 rate? And why 0 should be represented as 0001 and 1 as 0111 - why 4 bits?

Thanks for your help

submitted by /u/_trurl
[link] [comments]

Снимки с метеоспутников + SDR


I just tested NooElec SMArt XTR E4000 premium dongle for L-Band

NooElec offers a premium E4000 tuner based RTLSDR with a TCXO. This tuner is preferentially used for L-band frequencies, where it should be superior to the R820T2 based dongles. I compared the SMArt XTR to an older E4000 TerratecTStick+. Surprisingly the SMArt XTR totally fails after a warming up time of three minutes, whereas the Terratec runs for hours without any problem. The picture you see here shows the same signal received by the two dongles for an observation period of 10 minutes https://imgur.com/a/uFAE7
I repeated this multiple times. So I wonder if the design is that bad or if I just got a faulty product. Here is a list of components advertised by NooElec: E4000 tuner IC, 0.5PPM, ultra-low phase noise TCXO, 2 RF-suitable voltage regulators, Shielded primary inductor, Integrated custom heatsink

submitted by /u/MaxWorm
[link] [comments]

34c3 talk on the RTL-SDR based global open-source network of satellite ground-stations SatNOGS

34c3 talk on the RTL-SDR based global open-source network of satellite ground-stations SatNOGS submitted by /u/elkos
[link] [comments]

Outernet 3.0 Coming Soon: Free 30kbps – 100kbps satellite data downlink for news, weather, audio etc

submitted by /u/mooglinux
[link] [comments]

RTL-SDR bandpass-filter and DIY coax-notch filters

RTL-SDR bandpass-filter and DIY coax-notch filters submitted by /u/sanjurjo
[link] [comments]
Перевод
Рубрики
Архивы
Декабрь 2017
Пн Вт Ср Чт Пт Сб Вс
« Ноя   Янв »
 123
45678910
11121314151617
18192021222324
25262728293031