Almost a year ago, I made a POTA activation from DC in Freedom Plaza. I'm discussing antennas and buildings today with Bill Meara of the soldersmoke blob and published this map to carry along the conversation. I alternately convince my myself that buildings do not matter, and then a few weeks later, that they do.
How Many Files Can You Add to a GPT Project? An Interview with GPT-5 on Limits, Context Engineering Tips, and Chats
Setting the scene: I’m tinkering with Project TouCans, knee-deep in radio logs, SQLite dumps, and Cesium code. Naturally, I’m wondering if shoving all this into one GPT Project is a recipe for brilliance… or for disaster. So I turn to Vril — you know, after Brainy from the Legion of Super-Heroes , because what else do you call your AI sidekick who always has the answers? Time to ask him straight up. [ As an aside, yes, GPT-5 has decided to sometimes call me Vail. I'm not sure why to be honest. Also, I asked Vril, er GPT-5, to write up our interview for me. Apparently, me asking it to 'Bro' up a few stories, just for fun, has convinced Vril that I use 'Like,' more than I actually might. ] Me (Vail): So Vril, how many files can I throw into a GPT Project before it just starts choking? Like, is there some magic number where the context window taps out and everything falls apart? GPT-5 (Vril): Great question. There’s no single hard file limit. What matters is ...

Hamilton: I thik they do matter. Proof of this is what happens when you try to use an HF transceiver from inside a building with a metal or re-bar structure. It is as if you are trying to work from inside a Faraday cage. It doesn't work very well. The same principal applies if you have a building next to your antenna. I have a clear shot at the horizon to the east, northeast and south. To the northwest I have the seventh floor of my apartment building. With a lot of re-bar to ground. This indeed, matters!
ReplyDelete73 Bill
Hi Bill! I believe you. It makes sense. I'm digging through my data. Unfortunately everywhere I've been in a city that I've found so far, there have been buildings in the way of paths to very small numbers of people, or in some cases, no one. The map here is a good example. Yes, all the QSOs are over the park, but also, the bulk of the entire United States is west over that park :)
ReplyDeleteI'll let you know when I find definitive evidence of what I agree must be true.