Mahiteam is a Russian company that produces the relatively popular Malahit DSP1/DSP2 and Malahit DDC portable SDR radio which are great for shortwave listening, but can also cover up to 2 GHz. Manuel L. has been following developments and notes that Malahiteam are offering the ability to upgrade their DSP1 (and any DSP1 Chinese clone) into Malahit 2 units by sending the device in for a chip replacement. Manuel writes:
Hi. Recently it is possible to upgrade the Malahit DSP1 (original) and also the China clones (if registered in Russia) of the Malahit with a new CPU and if necessary a new audio codec chip. This upgrade has been officially released by the Malahiteam the developers.
This allows custom DSP2 firmware to run on the DSP1 and clones. This makes the device more powerful and also has the option of installing a Bluetooth board and controlling it via the software, as is the case with the DSP2.
This upgrade can be carried out directly in Russia by the Malahit team.
For Europe this is done by Jochen Köster DC9DD (Malahit Servise Europa) who converted the first DSP1 and China clones outside of Russia.
In the US, the future KD9NXV makes Mark Roy (USA Service Malahit).
I have tested the first conversions outside of Russia and it is a very big upgrade of the devices. They work a lot better now. I have shown this in several YouTube films. More information and contacts to the service teams outside of Russia can be found at Telegram and the Malahit Facebook group
A few weeks ago the tinySA Ultra was released. This is a spectrum analyzer capable of operating between 0.1 - 800 MHz, or 0.1 MHz - 6 GHz with the 'Ultra' mode enabled. A spectrum analyzer is a tool that allows users to visualize signals on the radio spectrum.
Previously the standard tinySA was released back in 2020. The Ultra version brings enhancements to the frequency range, signal generator range, bandpass filter range as well as an optional 20dB LNA, and a larger 4 inch color display.
During September 26 - 30 GNU Radio Conference 2022 was held in Washington DC. GNU Radio Conference (aka GRCon) is an annual conference centered around the GNU Radio Project and community, and is one of the premier software defined radio industry events. GNU Radio is an open source digital signals processing (DSP) tool which is used often with SDRs.
A few days ago videos of all the presentations were released on their YouTube channels, and all the talks can be found on this playlist. The videos contain a mix of in person and remote talks. A schedule of all talks can be found on the GNU Radio website.
The RX888 MK2 is a software defined radio with 1 kHz - to 1.7 GHz tuning range and up to 64 MHz of real time bandwidth between 1 kHz and 64 MHz and 10 MHz real time bandwidth between 64 MHz - 1.7 GHz. It is available on sites like Aliexpress for about US$170.
Previously we posted about how a number of SDR software developers issued a warning about the RX888, noting that it has very poor driver support, and very poor developer support.
However, in his video Matt reviews the RX888 MK2 and has a favorable opinion of the device. The video begins with an overview of the RX888, shows the driver installation process and then demonstrates the device operating in SDR Console V3 in HF reception mode.
The Red Pitaya is advertised as an open source electronics laboratory instrument, but as it's essentially a software defined radio with built in computing hardware, custom software can be installed allowing it to function as an HPSDR compatible RX/TX capable SDR.
The TRX DUO is a "Red Pitaya compatible" device that comes at a price significantly lower that the Red Pitaya. Its specifications are comparable to the Red Pitaya SDRlab 122-16 which in the official website goes for 625,00€ / US$622. In comparison the TRX DUO can be found on marketplace sites like Aliexpress for almost half price at US$320.
The TRX-DUO has a tuning range from 10 kHz to 60 MHz, 16-bit ADC and 2-RX and 2-TX channels. It also has a built in ARM Cortex A9 processor, and Xilinx Zynq 7010 FPGA SOC. The built in computing means that decoding software can be run directly on the device if desired.
Matt from the TechMinds YouTube channel has recently tested and reviewed the TRX-DUO in his latest video. His video goes over the specifications, software installation, and a demonstration of it receiving HF signals. He goes on to show how it can be used as an 8-band WSPR monitor, and how you can enable WiFi on it and download various Red Pitaya apps.
Matt also notes that the transmit power of the TRX-DUO is very small at 2.5 mW, but of course an external amplifier can be used to boost this. However, it is important to note that band filtering would be required for the emissions to be safe to transmit.
TRX DUO APPLICATION BASED HF SDR TRANSCEIVER (RED PIYATA)
Videos of talks from the Software Defined Radio Academy 2022 (SDRA22) conference have recently been uploaded to YouTube. SDRA22 was held during the HAMRadio World Fair in Friedrichshafen, Germany during June 2022. The talks include topics on:
Usage of SDR in a contest
PLLs in software defined radios
M17 Project: A new digital voice mode for VHF and up
RM Processor to Xilinx FPGA Connection for SDR
User-Assisted Spectrum Labeling
The perfect HF Receiver. How would it look like today?
FutureSDR: An Async SDR Runtime for Heterogeneous Architectures
Thank you to Joel Moser who has submitted news about his teams scientific research work at Soochow University in Suzhou, near Shanghai, China which makes use of RTL-SDR Blog V3 dongles in their research to replace bulky and expensive analysis equipment such as a lock-in amplifier, a vector network analyzer, or a spectrum analyzer. Their results show that an RTL-SDR can produce results as good as those more traditional pieces of equipment.
The researchers have also provided a summary video, which helps explain the science in an easier way. In a nutshell, as far as we understand it, they first use a laser optical interferometer to measure the graphene nanomechanical resonator, and then connect the output of the interferometer to the RTL-SDR, where the signal can be measured on a PC, and then easily put forward to further DSP processing in GNU Radio.
One interesting result is that they were able to recover very clear audio from the graphene nanomechanical resonator using the RTL-SDRs. This is highlighted in the video from around 4:25. Also provided via their website are two audio files demonstrating a clear reading of a Shakespeare sonnet, and a musical.
Our project is about detecting weak vibrations in nanomechanical resonators based on graphene drums. Graphene is an atomically thin membrane of carbon atoms. Graphene drums are made by suspending the membrane over an array of cavities nanofabricated in silicon oxide. Vibrations of the membrane are driven using a capacitive force at frequencies ranging from 10 to several hundreds of MHz. The detection of vibrations is done by optical interferometry, with the electrical output of our photodetector connected to a radio frequency measuring instrument. Usually, the measuring instrument is a lock-in amplifier, a vector network analyzer, or a spectrum analyzer, which are all rather bulky and expensive systems.
In our work, we demonstrate that graphene nanomechanical vibrations can be adequately measured with RTL-SDR v3 dongles. We find that the quality of our dongle-based measurements is as good as that of measurements made with a low noise spectrum analyzer, provided the driving force is not too small.
We take full advantage of your dongles by measuring the amplitude of two vibrational modes in parallel. For this, we split the output of the photodetector and connect it to two dongles. Measuring multiple modes in parallel is very valuable for nanomechanical sensing applications, as more information can be extracted compared to single mode measurements. However, this is a challenging task that requires several instruments collecting data in parallel. Here, we demonstrate that a composite of SDR dongles offers an alternative that is remarkably simple and inexpensive per frequency channel.
Finally, we show that our software-based instrument can be employed to demodulate human voice encoded in nanomechanical vibrations. For this, we drive vibrations with a frequency modulated force. As a baseband signal, we alternatively use a Chinese song performed by one of us, poetry by Shakespeare, and an excerpt from a musical.
We are now improving our measurement setup by synchronizing the clocks of several RTL-SDR v3 dongles to measure vibrational modes coherently. We are also greatly interested in employing your KrakenSDR for even better and cleaner multimode nanomechanical measurements.
A recent paper about our work can be freely accessed here:
Audio files for our demodulated nanomechanical signals can be found at the same address, but they are buried in a supplemental material (media) folder. Alternatively, the paper and the audio files can be found here:
The RX888 is a $200 software defined radio that has a 16-bit ADC and tuning range from 1 kHz up to 1.8 GHz, with a bandwidth of up to 64 MHz between 1 KHz to 64 MHz and 10 MHz between 64MHz - 1700MHz. The design is based on the RX-666 which is turn was based on Oscar Steila's (IK1XPV) BBRF103 original open source hobby design. The product is designed and manufactured in China and is sold on Aliexpress and eBay without any official company backing it.
While on paper, the RX888 has great specs and a great price, it appears that the software driver support from the manufacturer has been extremely poor, and no one has really been able to get this SDR working in practice without it constantly throwing errors and locking up.
@Aang245 & @Ryzerth are the developers of the popular open source SDR programs 'SatDump' and 'SDR++'. They often get queries to support the RX888, but have been unable to get much working due to broken drivers and no support from the manufacturer.
In the document Aang245, author of SatDump, discusses the technical problems he's been having with the library and drivers, noting that almost all of the library drive code is broken, leaving him unable to support the device in his software.
When actually attempting to use the library on any of my machines, pretty much nothing would work reliably, and even when streaming samples would work, gain control, frequency or simply loading the firmware would fail horribly.
Later, I tried instead using the ExtIO code, maintained by the original project maintainers. By then, libsddc mentioned above had been merged into that main repo. Seemed great… Until I tried to use it. To put it simply : It was bad before, but now it relied on an entire ExtIO, segfaulted seconds after trying to do anything, and of course what worked before didn’t even anymore.
A good reason for that is that when the library was “merged”, it instead was made to rely on ExtIO internals, with barely half of the functions even implemented or working...
...In summary, it just feels like the BBRF103 hobby project commercialized without any thoughts about consequences or the ecosystem, and not even usability. Same hardware, usually sold as a premium, but really just a bunch of parts hacked together.
Ryzerth, author of SDR++ then adds the following reinforcing viewpoint:
The code quality in the library was absolutely horrendous. Functions were unimplemented, stuff was hardcoded everywhere and it was just generally hacked together. Same goes for the firmware, it seems to be a barely modified “streaming” example from Cypress (the FX3 chip manufacturer)...
...I have tried multiple times to reach back to the manufacturer on twitter but they have been radio silent since April 2022...
...Something else that bothers me is that SDR seems to be popular in the SWL community. A bunch of people recommend it when the performance can only be described as mediocre. Making a wideband HF frontend is an art, and you’re not gonna get any good result from something built down to a price like it. It’s a cool ham radio project, but not something that can be marketed as a commercial SDR. I’ve seen people claim that it has superior performance to Airspy and SDRplay SDRs, which is complete bullsh*t...
...This SDR has been unlike any other SDR I’ve had to support. Other manufacturers have clean APIs, proper drivers and libraries. It usually takes me at most a day or two to support the hardware properly. Being an “aliexpress special”, I guess I shouldn’t be surprised, you get what you pay for. All the money went into the BOM and none into the R&D and software.
This entire saga highlights the fact that software defined radios are not only about the hardware specs. The support and state of the drivers from the manufacturer is key to allowing third party developers to integrate the device into their software.