ph4as

3D printed from brass / copper. Good performance @drom/helical-filter" target="_blank" rel="nofollow noopener">observablehq.com/@drom/helical-… Design is parametrizable in 500-2000MHz range. Did 2 and 3 stage versions

@halvarflake @travisgoodspeed Foundation of my career

The best thing I did in life was learn assembly at age 16 when everybody said it's a waste of time.

Some video from space courtesy of @TUBspace's TUBIN satellite. Received on X-Band by @redplanet00. You can see the satellite tracking a point on Earth as it is passing overhead, as well as some wobble in attitude when it first rotates.

In the case if you ever wanted to see what these cheapo 8GHz attenuators have inside.

距离上次坏掉又过去大半年了，最近花了两个星期的时间查到了故障点。在Phase tracking电路中有一个全加器，它有4个输入来自拨码开关，有些开关轻微漏电导致全加器输出处于亚稳态(视频为全加器Pin1输出)。给这四个拨码开关加了上拉电阻解决问题。使用这种极弱的TTL内部上拉显然是42年前的疏忽。

ワイヤボンディング始めるぞコラァ

Increasing Frequency Counter Precision with Linear Regression tomverbeure.github.io/2023/06/16/Fre…

Yesterday I switched the X-band kit over to LHCP. First satellite I tracked was FY3D .. and .. it looked as miserable as FY3F on RHCP; the exact same signal behaviour over elevation. So, this AM my first pretty succesfull FY3F pass. Mea culpa for not believing in it. Small crop.

Announcing gerber2ems - an #opensource script integrating @kicad_pcb with #OpenEMS, suitable for high frequency HW design, with 3D visualization in @Blender. Control your signal integrity analysis with our customized solutions: antmicro.com/blog/2023/11/o…

youtu.be/586Zn1ct-QA A must-see for all DSN nerds: the crossover we all waited for. @eevblog visiting @nascom1 !

I’ve been metal bashing and melting solder today. Definitely worth taking time to make a jig to help with the alignment and assembly of the new 10GHz W2IMU feed horn. #GHz_Bands

@petermeteor @redplanet00 @aang254 Thanks for the info!

@_ph4as_ @redplanet00 @aang254 Hi, thank you, the 1th one is ch. 3-2-1, the 2th is ch.2-2-1 combined, it seems like FY3G detects lightning as well....

My first FY3G 🛰️ catch ! i can only get it shortly..it went west--->east, thru a narrow corridor between houses at my south... signal peaked @ 18 DB, recorded @ 12 msps finally i had the oportunity to try it !

Now it’s time to compare my RF signal generators: MoRFeus, ERASynth Micro, tinySA Ultra’s signal gen mode, GenComm GC747A, and SignalHound VSG60A. First, I measure THD (total harmonic distortion) at 1GHZ on 0dBm and -20dBm output. I use SignalHound BB60D for measurements. 1/2

@fakehistoryhunt @PieceJake ?

On some photos of the liberation of the Netherlands I found this little black girl and I needed to know more about her, who she was, what her life was like, what happened to her. I haven't found her but did discover quite a bit. A history detective thread.

First imagery from FengYun-3G :-) (Received by @Dario24105) @CNSpaceflight here is the first public FengYun-3G image decoded just now, if you're interested.

starting a new series of electromagnetic simulations and renders using openEMS in Blender! This animation shows how a wave propagates in a coax with open termination #b3d #Blender3d @kicad_pcb @FreeCADNews @DanielBogdanoff #Simulation #electronics @hackaday @Chris_Gammell

LibreCAL github.com/jankae/LibreCAL 4-port, 9kHz to 6GHz eCal module for VNAs. some empty links.. #VNA #VectorNetworkAnalyzer #LibreVNA

@M1SJE @g4bao bungard.de/en/consumables… these work pretty well

@g4bao The hole size of these vias are too small for rivets, plus the board needs to be flush against the heat spreader. Like the hole size for these boards are 0.6mm as they're densely packed.

Experimenting with my UV resin printer and making PCBs. I've got some Rogers 6035HTC that needs a PCB etched on it 🙂. But first, practicing on FR4.

CAS-5A. Photo 07. Thanks to the decoder @knglaser, but also the hard work of @scott23192 and @HRPTEgor I have such a picture! I sent to satellite twice requesting *07# . I saved the kss file and processed the decoder. SUCCESS ! @DL4PD @SatNOGS @ea4gpz