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Bis zu welchem Level geht ihr mit?

This is how this Scionix scintillation detector looks from the inside. Dynodes of the PMT and inner connector to PMT nicely visible.

I've set up a simulation of a Rotman lens to drive a phased array in Elmer. The matching of the ports is poor, causing lots of internal reflections, resulting in unwanted side lobes and poor channel separation. Nonetheless I think it still demonstrates the principle nicely 😊

I sometimes wish I had more than 2 hands, especially when I'm trying to hold 2 meter probes on the back of a switch whilst trying to operate said switch to see if it works. So I came up with this by combining the pencil holder halves of 2 cheap drawing compasses.

Where are the RF experts? I tried to design a 1.700GHz patch antenna and failed. Please refer to KiCAD screenshot for parameters and dimensions from the calculators. Resonance is spot on but impedance is off at 25 Ohms. Can anyone spot my mistake? (Yes I calibrated the VNA)

Pro tip: solder the SMDs *before* the pokey bits 😬

How about some SSTV? We're planning a Slow Scan Television experiment next week. It's scheduled to start Tue. Oct. 8 and run through Mon. Oct. 14. During the experiment, it will replace APRS on the Service Module ham radio, 145.800 MHz. Details in the graphic.

Incoming ARISS - Amateur Radio on the ISS #SSTV activity Testing new #HAM gear onboard the #ISS Downlink 145,800 MHz FM-N PD120 MODE from Oct, 08 16:00 to Oct 14 14:10 (UTC) Upload images spaceflightsoftware.com/ARISS_SSTV and request award ariss.pzk.org.pl/sstv/ #Expedition72

I did not have the luck to get all 12 images of the last #ISS #SSTV ARISS - Amateur Radio on the ISS event, got many of the already received images double or triple but really nice to have participated in a working event again, thanks to Robbie Ei2iP 🇮🇪 for the template!

Managed to get the Aaronia AG Spectran V6 ECO running with #satdump lego11 📡 . Needed coded changes are actually not that much.

New #SSTV broadcast from the 🇷🇺 🛰️ UmKA-1 (RS40S) is scheduled for this weekend, Oct 15 evening UTC - Oct 17. 4 images will be transmitted. Three children’s drawings and a special image celebrating the 50th anniv of AMSAT 🛰️ OSCAR-7 Phase 2B (AO-7). Amsat-f AMSAT-UK Iss Fan Club

Received one #SSTV image from SONATE-2 on 145.880MHz FM, 13:55 UTC Professorship for Space Technology Uni Würzburg AMSAT

My final result of the last #ISS #SSTV event, thanks to Robbie Ei2iP 🇮🇪 again for the template. ARISS - Amateur Radio on the ISS ISS Ham Iss Fan Club AMSAT