@SP6GSA Very loooong buterfly capacitor or maybe two shorter? Two coupled magnetic antenna loops?

@pe0sat Marry Christmas and happy New Year to you too, Jan.

@MacDona76161341 The tube grid IS negative here, because of charged C3. It is charged on first positive half-period of RF signal and stays charged all the time. R2 is in the range of mega ohms, so the R2C3 time constant is much longer than the period of RF signal, but shorter than audio period.

@ElecNotes To simplify: Both upper diff amps are connected together Anti-Parallel, so one amplify/multiply the input signal by positive value, while the other by negative. And the third/lower diff amp switches between those two amps, according to polarity of the local oscillator input sig.

@ElecNotes

@ElecNotes The crucial part is C1. In forward biasing, when the grid leaks the current, it is charged to the positive amplitude of the RF signal. And then follows the envelope of the RF signal by slowly discharging through R1. In this case, C1 holds the audio signal, amplified again by tube

@synx508 Are you satisfied with this GPSDO? Did you try to lock 10 GHz Rx on this reference?

🌟 Thrilled to receive a certificate for my project, Eagle Eye AI: Smart Following Camera with Face Recognition, in the #AMD Pervasive AI Contest! 🏆 Huge thanks to @AMD and @HacksterIO for this amazing opportunity to innovate and learn. #AI #Robotics

RT @alexonline888: I've MASSIVELY updated my @AMD Advancing AI 2024 article into a feature with several never-before-seen videos and ALL th…

@ElecNotes Surprised no one has mentioned C3 yet! Along with the parallel resistor and the grid, it forms AM demodulator. When a positive voltage hits the grid, it acts like a diode, rectifying the AM signal. This creates an audio signal on C3, which is then amplified again. Very genius.

RT @gabeElbling: Amazing graphical representation of a neural net, never seen anything like it.

@pe0sat @itsfoss2 Less is more, and even less is greater still. :)

@NotBlackMagic1 Interesting project. Congratulations!

RT @DNechitailov: PCS Electronics has published the source code for their mini OCXO generator:

RT @pe0sat: Despite that the status is "LOST" the other MEO satellite TRISAT-R (53108) launched with IO-117 (GREENCUBE) is still active on…

🚀 Just finished my #EagleEyeAI project using the Kria KR260 board! It features AI-driven face tracking with an IP camera, pan-tilt rotator, and ROS2 nodes. Huge thanks to @AMD and @Hacksterio for an amazing learning experience! Check it out on !

RT @ATaylorFPGA: This one might get a few comments! How to use git source control with Vivado projects. It is straight forward for more mod…

RT @ea4gpz: New blog post: Recording DME with the LimeSDR. I talk about how I have recorded the DME aircraft navigation signals using a Lim…

@ea4gpz 915 ISM band antenna + LNA powered by LiPo battery + Wilkinson power splitter + 2 Rx port on LineSDR USB? Hmm… No idea, why 2 receivers on the same antenna. Just comparing the sensitivity or latency of LimeSDR ports? 🤔

@PhysInHistory Why does this post have so many likes? The last equation on the right-hand side is incomplete. It should be ∫(∂E/∂t) • da. Didn’t anyone notice?