My good friend and Elmer N4CZT that recently past away have been tossing a project around for the last 6 months or so. He was a diehard satellite operator at one time then got very heavy into 6 meters. He and myself had been discussing building a linear ssb transponder. ( like one of the older Oscar birds) Just an analog type with a small bandwidth.. Since he passed away I have been thinking more and more about it. And one day, after a lot of study, I like to do this in memory of him. I have already played around with a cross band repeater. That was fun. 70cm receive and 2 meter transmit. Very simple and most dual banders will do that. This one was to have a 70cm ssb receiver, a 2-meter ssb transmitter with one watt, along with a shared IF circuit for linear operation. No on board computer controlling it. It was going to be in one of the old satellite frequency ranges, put on a small tower and activated at certain times by a computer. We even had a fellow that said if we made it small enough he would fly it over several counties in his hot air balloon but that was not the importance of the project. The biggest reason was to learn more about it and experimentation. I have spent the last few weeks searching different articles on the web about ssb transponders. I have found this to be a big challenge for me. He was the brains behind it and probably forgot more in the first few years of his Amateur career than I will ever know. I know it sounds maybe like a “why do that” type of project but it was important to him. And if it takes me rest of my life to do it then that is how it is. I just can not seem to get it out of my mind. Open for discussion?