Tagged: rtl-sdr

Demonstration of Two SatNOGS Rotators

Thank you to IZ5RZR for writing in and sharing his two SatNOGS rotator builds with us. SatNOGS is an open source project that aims to make it easy for volunteers to build and run RTL-SDR or other SDR based RF ground stations that automatically monitor satellites, and upload that data to the internet for public access.

IZ5RZR writes that he's now made two rotators and one was modified to use a 5:18 stepper motor (which is upgradable to 50:1) to give more torque so that heavier antennas can be turned smoothly. His rotators are powered by a 12V battery charged by solar, and they can be controlled over WiFi with a PC/tablet/phone. He's also tested the rotators with a 24 dB parabolic grid antenna and found that the rotator could handle it even without a counterweight. He also notes that together with IK5XWA they've fixed a "Meridian Flip" bug in the firmware.

The video below shows the two rotators in action.

IZ5RZR Two SatNOGS Satellite Rotators

SignalsEverywhere Video: SDRAngel How to Receive Basics Tutorial

Over on his YouTube channel SignalsEverywhere, Corrosive has posted a new video tutorial explaining how to use the SDRAngel software for receiving signals in Windows. SDRAngel is a general purpose SDR program similar to programs like SDR#, HDSDR and SDR-Console, however it's layout and workflow is slightly different compared to other programs. SDRAngel also has some interesting features such as built in decoders for DMR, D-Star and Fusion digital voice signals and unlike most other general purpose SDR programs, SDRAngel is also capable of controlling transmit capable SDRs. Corrosive notes that he will discuss that feature in a future tutorial.

Corrosive's tutorial goes over the main points such as changing gain, changing sample rate, tuning to signals, and adding demodulators. In the video he uses an RTL-SDR as the receiver.

RTL SDR SDRAngel Tutorial - How to Receive Basics and More

YouTube Tutorial: Decoding POCSAG and FLEX Pager Messages on Windows with PDW

Pager systems are famously known to be insecure, and due to the lack of encryption and high transmit power anyone with an RTL-SDR or other SDR can receive and decode pager messages. The users of pagers are mostly hospitals and doctors, and IT infrastructure professionals who need to be notified of server warnings and errors quickly. We have a text tutorial on decoding these messages with an RTL-SDR available here, and there are several previous posts discussing how insecure they are. 

If you prefer a video tutorial, M6LME on YouTube has recently uploaded one where he explains the PDW pager decoding software, the VB-Audio 'banana' audio mixing software, and how to use SDR-Console with an RTL-SDR and the aforementioned software to receive and decode the signal.

How to Decode POCSAG & FLEX using an RTL-SDR Dongle

Amateur Radio on the Es’hail-2 Satellite Explained on YouTube

Over on YouTube Tech Minds has posted a video explaining what Es'hail-2 satellite is and why it is interesting for hams and SDR users. Briefly Es'hail-2 is a recently launched geostationary TV satellite that covers Africa, Europe, the Middle East, India, eastern Brazil and the west half of Russia/Asia.

What's special about it is that apart from the TV transmitters, it also contains the worlds first amateur radio transponder in geostationary orbit. So amateur radio users within the region covered by the satellite can simply point their antennas to a fixed position in the sky to transmit to the satellite, and the signal will be rebroadcast over the entire covered area. With a simple LNB, satellite dish and SDR the signals can be received.

After explaining Es'hail-2 Tech Minds also shows a demo of Es'hail-2 radio traffic using a public WebSDR.

The Worlds First Geostationary Satellite For Ham Radio - Es'Hail 2 - Qatar OSCAR-100

SignalsEverywhere Podcast EP1: Es’hail-2, Favorite RTL-SDR Blog Posts and What SDR Should I Get?

Corrosive from the SignalsEverywhere YouTube channel is starting up a radio/SDR related podcast, and today has released episode one. The podcast is 22 minutes long, and in that time he discusses Es-hail-2, a geosynchronous satellite with an amateur radio transponder that was recently launched and activated, some of his favorite recent posts from our blog here at RTL-SDR.com, including posts about a 3D printed V-Dipole holder, Radwave RF Analyzer, cloning 433 MHz devices, and finally he ends the podcast by discussing the question of what SDR is right for you.

Podcasts are a great way to catch up on what's happening in the SDR and radio world so check it out below or over on the SignalsEverywhere podcast post.

rsp_tcp: An rtl_tcp compatible IQ Server for SDRplay SDRs

The SDRplay team have released an updated version of a program called "rsp_tcp" (originally written by F4FHH Nicholas). This is a streaming IQ server for SDRplay devices, which is directly ported from the original rtl_tcp code that was designed for RTL-SDRs. The rsp_tcp code is fully compatible with the rtl_tcp protocol, so this should allow almost any software that accepts an rtl_tcp stream as an input to use an SDRplay device as the SDR hardware instead of an RTL-SDR.

The downside to using this server is that in order to be compatible with the standard rtl_tcp protocol, the software will downgrade the RSP data stream from 14-bits to 8-bits only, thus forfeiting the RSP's greater dynamic range. However, if a custom ExtIO plugin is used on the client software, then the full 14-bits can be restored.

On their forums the SDRplay team write:

This software is based on a fork of F4FHH’s version of RTL TCP Server. It has been updated to support the RSP features, but also contains an extended mode. The extended mode allows the client (via a compatible interface) to fully control all aspects of the RSPs, including notch filters, Bias-T enable and switching ports (where applicable)

The user guide for the server software can be found on our downloads page and also here: https://www.sdrplay.com/docs/SDRplay_RS ... _Guide.pdf

We have provided binaries for Windows, Mac and RPi on our downloads page and the source code for all platforms can be found on our GitHub repository: https://github.com/SDRplay/RSPTCPServer

To utilise the extended mode, extra commands need to be sent from the client. We have provided an example of this in the form of an ExtIO plugin. You can find the Windows dll on our downloads page and the source code for the plugin on our GitHub repository: https://github.com/SDRplay/ExtIO_RSP_TCP

In standard mode, the server will be compatible with any RTL server client.

The team also note that they have updated their Raspberry Pi SD card to include the server.

XRIT Decoder Updated: Improved Image Quality and IR Enhancements

USA-Satcom is the programmer of XRIT Decoder, which is a popular (paid) Windows decoding application for GOES weather satellites. With a WiFi grid dish antenna, LNA and SDRplay, Airspy or even an RTL-SDR, high resolution full disk images of the earth can be downloaded from these geosynchronous satellites. Browse through our previous GOES posts for ideas and various tutorials about setting up a receiver.

Recently, XRIT decoder has been updated and now has improved image quality and an antenna alignment helper tool. A further update also adds improved processing for IR images. Over on the SDRplay forums RSP2user has been testing the updates and writes:

USA- Satcom has just released version 1.4.6985 of the XRIT Decoder software package. New features include:

1) Improved image clarity.
2) An antenna Align Mode feature.
3) And a Viterbi and Eb/No (Energy per Bit to Noise Power Spectral Density Ratio akanormalized SNR) graph over time feature. 

The improved image clarity reduces image artifacts at the Earth-space boundary of the image and improves the overall aesthetics of the colorization of the full disk images. The images are quite amazing. The resolution is far better than what can be shown here due to image size limitations for this site. Below is a full disk GOES 16 image from February 17, 2019 and a corresponding zoomed in portion to get an idea of the resolution and clarity (the actual full disk images are approximately 40MB PNG images each which are much greater resolution than the below image)

The antenna Align Mode is a great new feature that allows users to view the Signal Quality, Viterbi FEC, and Eb/No from a distance using large numeric values. This mode enables users to better view these values when fine tuning adjustments to GOES receiving antennas. The Eb/No and Viterbi graphing enables users to see how well their receiving system is doing throughout the day (e.g., over temperature and while the sun is in alignment with the receiving path).

GOES 16 Received by RSP2User
GOES 16 Received by RSP2User

More updates from USA-Satcom to the XRIT Decoder software with a new patch from today. The XRIT file manager now provides IR image enhancements for GOES Bands 8 and 13. Here are some examples:

G16 CH13 & G16 Band8 Enhancements . Images received by RSP2user.
G16 CH13 & G16 Band8 Enhancements . Images received by RSP2user.

See the post on the SDRplay forums for further details, higher res images and the full update history.

ExaGear x86 Emulator for ARM To be Discontinued

ExaGear is an x86 emulator for ARM computing devices. In the past we posted about ExaGear as together with WINE, it was an affordable solution that allowed Windows SDR apps to run on ARM devices like the Raspberry Pi 3. With ExaGear and WINE we were able to get Windows only SDR programs like Unitrunker, WinSTD C, DSD+, MultiPSK, PC-HFDL, Orbitron and Sondemonitor to run smoothly. In another previous post, DE8MSH was also able to use ExaGear to get Speclab running on his Raspberry Pi 3.

Unfortunately it appears that ExaGear is to be discontinued from February 28 onwards although they note that all previously purchased licences will continue to work. No reason has been given other than noting that it is their business decision. For now the downloads and ability to purchase licences is still active until February 28, so if ExaGear was a product you were interested in, you have just over a week to obtain it.

ExaGear to be discontinued
ExaGear to be discontinued