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
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
One of my objectives for the good weather in Maine during my holiday travel was to get out to the convenient and interesting parks in the area. As highlighted by W1DED 's map documenting POTA MAINE , there are a couple of Midcoast Maine parks that had no activations ever by 2022: both the Durham State Forest and Ducktrap River Wildlife Management Area. The reason? They're poorly documented locations with no convenient drive-up-and-know-you're-there place. The WMA even overlaps the local Ducktrap Preserve, but you'd have to figure out what that meant and where to hike. And the forest, well, the forest barely even seems to exist on the internet by that name! No official state information and just lots of OpenStreetMap references. I looked to take on the forest to understand where it was, what the access looked like, and then get out there and put the park on the air.
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