jeppeth

RF IC design engineer. Tinkering with wide band mmwave designs. Everyday is a new day to learn something new.

[Paweł Sujkowski SQ1GQC @SQ1GQC]

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.

[Paweł Sujkowski SQ1GQC @SQ1GQC]

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.

[Tτ @teraytech]

Microstrip filters project PCB and test data files are now accessible on my github. Have fun😇https://t.co/DwjmTD0xDi

[will whang🌻 @will_whang]

Finally setup a flow of using GPU to find the parameters for this type(WA5VJB Yagi) of PCB Yagi

[MyriadRF @MyriadRF]

<<< OTA! >>> Featuring: LimeSDR Micro Video Walkthroughs, an Open-Source LimeSDR USB Case, Big Bang Entropy, CDMA2000 'From RF to Core,' and More.

https://t.co/wFtkMPRMQ6

#SDR #wireless #OSHW #OpenHardware #OpenSource #FOSS #LimeSDR #LA9310 #LMS7002M #shortwave #CMDA2000

[Mehdi @MehdiHacks]

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!

[jeppeth @jeppeth2]

@giammaiot2 If one were to develop a sdr modular based crpa gps receiver there would be a market for one in Europe / Ukrainian?

[jeppeth @jeppeth2]

@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

[BI4NLB @A_Wind_Listener]

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

[jeppeth @jeppeth2]

@MehdiHacks @JohaPrime What about the librevna? How does that compare?

[jeppeth @jeppeth2]

@olegkutkov That’s a great deal! Awesome sig gen!

[Denis @rf_hacking]

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

[GiamMa-based researchers SDR R&D IoT @giammaiot2]

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 😎

[金魚 @twi_kingyo]

RF over Fiber で快適SDRライフを📡　#kingyolab

[DanielR @DanielR_PhD]

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.

[DanielR @DanielR_PhD]

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

[Mehdi @MehdiHacks]

🧵
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

[GiamMa-based researchers SDR R&D IoT @giammaiot2]

LibreCAL

https://t.co/3RW5pkd1nY

4-port, 9kHz to 6GHz eCal module for VNAs.

some empty links..

#VNA #VectorNetworkAnalyzer
#LibreVNA

[Marcelo Samsoniuk @samsoniuk]

#riscv is just cheap as sand! but be careful: 4.95$ for 50 pieces! so order "10" will result in 500 devices! 🔥 https://t.co/Vxq8VhwTMS