Denis

@MehdiHacks M.B.

I found a weird radio signal while monitoring the situation. Apparently since last year, there has been an encrypted (military?) activity on the amateur 40m band, every day! From 7040 to 7070 KHz (I heard them today on 4 different frequencies) Have you guys heard about this?

@engrfix1 Fire!

Say Goodbye to Hammers: The Ultimate DIY Tool!

@rory_bushell Spot on!

@rf_hacking That's probably the worst value proposition I've ever seen

Malahit Mlite-880 – SSB/AM/FM shortwave receiver. The noise reduction feature works really well. Bluetooth support included. For $247.35 aliexpress.com/item/100500981…

@MehdiHacks Everyone’s got basically the same SDR toys haha. Good to see like-minded people, bro (just followed you).

@alilakrakbi I found this here — cubic.com/inflatable-sat…

@rf_hacking Thats a satellite antenna? Is there a reflector inside? I have a hard time understanding how it works if it is inflated

1.2m inflatable antenna operating in Ku, C, X, and Ka bands. Designed for tactical operations.

I may have found the source of the powerful clicks on the airwaves. It's likely China's over-the-horizon radar (OTHR), due to the ongoing military exercises near Taiwan. bbc.com/news/articles/…

A powerful clicker has appeared on shortwave. It is most often observed in the direction of Asia. I listened on several WebSDRs. You can observe short powerful clicks around 21 MHz. It might be some kind of over-the-horizon radar.

Zynq7010 AD9363 XC7Z010 Development Board PlutoSDR Nano for US $77.53! aliexpress.com/item/100501031…

@tty0x24 Thank you for offering to help. If I need your support, I'll reach out.

@rf_hacking Do you have a spec for your project? If open sourcing your firmware, I can build pcba for free.

The AD9371 chip has been around for a long time, but it never gained the same mass popularity for building TX/RX SDRs as the AD936x. On top of that, the evaluation board used to be prohibitively expensive. Now for $275 and have live 100 MHz bandwidth goo.su/zwJcTp1

@tty0x24 I've come across this chip before, but I forgot its specs. By the way, it's also worth trying to use it in the PhantomSDR project.

@rf_hacking Can offer you an ADRV9009 evm copy at a reasonable price. Only 1 dbm lower output power than the official version at 6GHz.

@aholtzma I didn't know about those features of the AD9371 -thanks! I wasn't able to add the part about trying this chip in PhantomSDR and digitizing a 100 MHz bandwidth. But it's hard to say what the network load would be.

@rf_hacking That part is designed for cellular and the IQ tracking and LO calibration take forever on a frequency change, on the order of 5-10 seconds. Not great for an SDR.

@Cybernetic_Eng I agree. But if we consider ourselves radio amateurs, building a converter won't be difficult.

@rf_hacking The lowest tuneable frequency of 300MHz makes the AD9371 chip less appealing to hams. The ham community has been a considerable driving force in bringing SDR to the masses.

GPS Assisted RTL-SDR For The Vivid Unit - Runs Debian 11! youtu.be/iDxrLT_Xoa8 #sdr #rtlsdr #ham #hamradio

@cemaxecuter PhantomSDR does not work well with CUDA. I was unable to run a server with this accelerator. I tried on different processors and cards.

@rf_hacking I see it mentions CUDA, nice. I recall with CyberEther some small changes needed to account for the Jetson’s CUDA, maybe that’s already taken care of here

I acquired an RX-888 and launched PhantomSDR. I recommend using the PhantomSDR-plus fork - github.com/Steven9101/Nov…. I couldn't properly configure OpenCL to work with the integrated graphics chip of the processor. It's better to use a chip no higher than HD530. Ideally, an Nvidia.

@cemaxecuter Jetson processors do not natively support OpenCL.

@rf_hacking How about w/ a Jetson and its GPU?

@signalvoyager Clarify the question plz.

@rf_hacking why is it bad? I mean, which part of RF performance factors get affected?

Another Chinese clone of Airspy, $85. I previously wrote that buying this is not recommended. Be careful. aliexpress.com/item/100500138…