Sky September 11th

Another round of funny enough morning clouds to throw on the blog.

Sky over Fitchburg, Wisconsin on the morning of 2025-09-11. Shot with Samsung Galaxy S25+, unprocessed JPEG.

 

Comments

Post a Comment

Popular posts from this blog

Parks on the Air: Oops, RaDAR, K-1459 Lake Kegonsa State Park and K-4250 Capital Spring State Recreation Area

Image
It was a nice day in Wisconsin and, having taken Friday the 25th off for video gaming, it was a nice change of pace to throw in some POTA in a new location on Sunday the 28th. The actual intention was getting to K-1459 Lake Kegonsa State Park ( wiki ), which I definitely managed to do. I'll get to the RaDAR in a bit. On the way out of town, I stopped by Bagels Forever, a local bagel factory with walk-in service counter serving a full selection of options. I chose my standard sausage-egg-and-cheese, gouda, on sesame with two additional cold plain bagels since they were out of chocolate chip and bagel sticks. These are key to getting set up! Getting setup on a picnic table at the snowy Williams Knoll as the bench dries out
Read more

Expanding on W1GHZ GaAsFET LNA Bias with Optocouplers

Image
After reading the W1GHZ GaAsFET LNA Bias entry, I wanted to see what the performance of these exposed-base optocouplers are. The concept comes from the IEEE Microwave Journal Application Notes: Photovoltaic Bias for Depletion-Mode Devices in Low-Noise Amplifier Applications (DOI 10.1109/MMM.2022.3226635). It's not open access, so I figured some publicly available characterization data would be cool to share. I have access to a dual-channel precision SMU (source-measure unit, Wikipedia ) and that's exactly what we need to characterize the photovoltaic behavior of optocouplers! Keysight B2902B SMU front panel during a 20 mA input, open circuit output measurement
Read more