Finalized today my new project. WG42 to SMA transition, optimized for the 24 GHz amateur radio band. Milled from CuZn39Pb2 brass, 4 tuning screws M1.6x4 ISO 4766 and Sealectro 50-443-4310-3 SMA connector. A month ago I designed and ordered milling of the body, today I assembled,tuned and measured the parameters. I measured with an HP 8510C using the "Adapter Removal" calibration intended for nonisertable devices (two calibration kits, one for WR42 WG and one for 3.5 mm coaxial). Half a day to measure and tune a single adapter! Now of course it will go faster when I have the calibration ready. The parameters are decent, at 24.045 GHz the return loss on the waveguide side is -43 dB and on the SMA connector side -37 dB. Attenuation is about 0.13 dB. It's time to finish building the transverter and make some QSO in the 24 GHz band.
Another “building block” in my 76 GHz TRV project. LO source: 9486 MHz synthesizer. Conversion formula: (9486 MHz × 8) + 144 MHz (IF) = 76032 MHz. Implemented as a cascade of two Texas Instruments LMX2820 synthesizers.
tinySA Ultra+ claims it can "observe" signals up to 12 GHz!
I tested the claim with a 12 GHz signal, and it actually works!
The amplitude reading is not accurate, but it's good enough to confirm the presence of a signal!
@giammaiot2 Are there any developments of cost effective crpa gps systems in eu / Ukraine? So fare I have only been able to see Russian / Iranian systems
Here comes the new toy~got an used PXIe-5644R from NI, plan to dock it with the backplane designed by Marsupilami and try some RF input and output soon~
https://t.co/zLW8AiYRG6
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 https://t.co/N3bEgsBu7x
Thousands of Chinese Fishing Boats Quietly Form Vast Sea Barriers
Marine net finder AIS + RX By dial-a-small-monkey Via Reddit
https://t.co/NYLywECFzW
I would add this to any analysis on the topic 😎
1. Combining a low-cost drone with a fibre-optic communication link produces a formidable weapon that is impervious to electronic defenses. Here is a look at how a small Chinese company called Skywalker developed an easy-to-use fibre-optic kit that has changed the war.
1. Magic radios? Russian Telegram channels rave about “magic” Russian-made Hermes anti-interference communication kit for controlling #drones and how it is a completely Russian development. Let’s have a closer look at this marvel of Russian engineering.
https://t.co/2DMQ3JLPGh
🧵
Mega thread on RF, SDR, ham radio, and signal hacking:
I've been writing educational posts and threads on these topics.
To help finding them easier, I will put all the links here.
And I will link the new threads to the bottom of this meta thread every time I write one.
0/n