I remember a lot more simple circuits being available on the bbs's. I guess it's been a while but this new bbs thing (the "internet" they call it), just does seem to have as many. Any who, I have found a few black box-less radios (tx or rx) out there. Just surprisingly fewer than I would have expected.
So clearly there are some good resources out there. They just didn't jump out at me like I would have expected. Any preferences?