Issue link: https://digital.copcomm.com/i/783510
in frequency to any of the intermodulation products cal- culated in stage one, leaving only compatible channels. There are variations to that theme in FreqFinder, but that is the broad concept. THAT SOUNDS LIKE A LOT OF CALCULATIONS. IS IT SLOW? At fi rst, yes, and I had to do some UI magic to make it seem fast. For example: previously, when a user selected a trans- mitter and the confi guration page appeared, the Compat- ible Channels calculation would start for that transmit- ter before the user navigated to the Compatible Channels screen. Now, devices are much faster and I've optimized the calculation quite a bit so the Compatible Channels list is generated more on demand. THAT'S PRETTY COOL! GOOD JOB! Thanks! Unfortunately, optimizing the calculation does make it diffi cult to alter it later. The speed boost in hard- ware has helped with some changes I felt were necessary later on. SO WHAT ABOUT THIS TVDB THING I KEEP HEARING ABOUT? Honestly, I think it's the most useful part of FreqFinder. In all the experience I have with radio, the most critical aspect to performance beyond intermodulation and near- by operators is competing TV stations. TVDB provides a calculation of the fi eld strength based on location, and in my experience, that number generally correlates with how happy I am with radio performance on a given day. HIGH PRAISE FOR THIS EXTRA IN FREQ FINDER. Don't get me wrong, one should look out for anything that can go wrong. But intermodulation and the random taxi dispatch aren't always factors. TV stations are the fi rst thing to show up on a scan. At least in the United States, our legal operating ranges are TV station chan- nels. Knowing how strong they are for a given channel is paramount. SO WHY IS TVDB ONLY AVAILABLE IN THE UNITED STATES? The FreqFinder app downloads directly from the FCC for its TV station data. I don't run any servers or collect data to support TVDB, and it is important to give users up-to-date and authority-provided data. I've looked into other govern- ment agencies for other countries. Their data either needs to be translated or is not as complete or easy to access as the FCC's. They even provided me the code I use to calcu- late fi eld strength. iPHONE ANDROID