Copasetic Flow

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Presidio POTA (US-7889) inside Golden Gate NRA (US-0647) — QRP CW, transit, and a surprise eyeball QSO

Live portable ham radio from San Francisco’s Presidio with a clean take-off toward the Pacific. Route via PresidiGo, light wire vertical, and a crystal-locked 14.0574 MHz start. I keep local times in the story; the QSO map is in UTC. I arrived downtown at Embarcadero Station at 15:20 PST yesterday with Project Toucans , a portable ham radio. There was a newly married couple, still in their dress and tux, waiting to ride the cable car up towards California and Powell. I was waiting for the PresidiGo bus out to the Presidio. It's a free bus out to the park that passes through downtown several times a day. I hopped on the bus at 4 PM downtown. After a few stops at 4:07 PM PST, the bus was completely full. Interestingly, when we arrived at the first Presidio stop at 4:15, almost everyone got off and exited the Presidio back towards town. I don't know why. The bus winded through the rest of the Presidio towards the transit center. The center is right in front of the new park, cal...

GPT5 Reads Schematics,Does Simple RF Analysis!

GPT5 helped me understand how the Tuna Topper ][ amplifier in Project TouCans operates yesterday. It started from just this clip of the schematic! While debugging the power supply relay of Project TouCans a few days ago, I noticed an interesting thing. With the Pico-W rig controller plugged into the supply brick TouCans itself was only being doled out twelve volts by the phone charging brick in its base, not the fifteen volts its USB-C adapter was asking for. That mattered the most to the Tuna Topper II amplifier that drives the five watts to the antenna. I changed the rig so that, for now, the Pico-W runs on three AA batteries. That upped the supplly to the rig back to its intended fifteen volts. I wanted to understand in broad terms what that meant for the power output of the rig. I tooled around for a bit on paper and spreadsheets before it occurred to me to ask GPT5. I didn't expect to get an answer at all. I definitely didn't expect it to be able to read the sc...

OpenAI ChatGPT Frequently (Always?) Opening in 4o

Early Sunday morning, the code generated by ChatGPT became noticeably clunky. Why!? I figured it out when this message arrived Ah yes! The LLM that berates me a bit for the code it wrote :) At some point after the release of GPT5, OpenAI started defaulting my chats back to 4o. For me GPT5 is better. I switched back over 5 and a bit later, the code coming out of the LLM was just working, and when it didn't, I got messages like this By the way, at that point GPT5 was fixing code created by 4o when I had specifically asked for: " Also save the vh and vw settings of the subpanel in subpanelsize and resize it to its original extent if the subpanelsize arg is present in a url " Anyway! GPT5 rocks for me. If you're using the browser UI instead of the API, check to see what model you're using before you go too far down the wrong path.

Things I Learned: Using URLs to Store Web App State in Cesium Sandcastle

With Cesium Ion Sandcastle users can try out various parts of the Cesium JS library to create maps. Once their code is working, they can also share those maps with the code. I initially wondered about the infrastructure that required to store and then serve every single map examples code. Then, I realized that the code isn't stored in a server, it's in the share URL! I originally started to put this together when I noticed how long a typical Cesium Sandcastle is. They tend to look like this: except longer. The seemingly random characters are a base64 encoded transcript of the JavaScript code along with the html and styling for the Sandcastle project. The fact that everything was encoded in the URL made me wonder what else could be achieved with the URL. A lot, it turns out. NOTE : I discovered it's important to place your additional URL args before the #c anchor that contains the Sandcastle code. Otherwise, your args get interpreted as being part of the JavaScript that...

Grey Line in Sweden and New Mexico Demonstration

I'm using the new map in map feature I coded up this week to for a map that demonstrates that as the sun sets in Sweden, it's rising near Las Cruces, NM. A few minutes later, my QSO to Sweden from the Organ Mountains went through. The code is in a github repo . Here's the map: And here's a video demonstrating how to interact with the map above: For those who are curious, here's how Project TouCans was situated that day. Note that the dipole is only about five feet off the ground.

Implementing the new QSO Map in Map View

I frequently find myself zooming in and out of QSO maps to see where the sun was with regard to my station's horizon vs how far a given QSO propagated. I wanted a way to view maps without all the zooming. Now I have it! How I got It I've had Cesium maps on the blog for a while. Once I got the idea for a better way to view QSO maps, I deliberately executed on the habit I've been trying to build in myself: I immediately asked GPT5 if it could augment my existing code. It turned out that it definitely could. In under half an hour, I had the new map view pictured above. You can steer around the maps at my POTA post . The code for implementing map in map can be found in the csm-map-n-map repo.