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Signal generators make a great low power transmitter.
Some 30 years ago when I was teaching at National Institute of Technology a local radio station donated their surplus GE FM transmitter. A 250 watt exciter the size of a large refrigerator.
It provided a great hands on learning experience for our students. We refurbished it and ran it into a dummy load. Then we thought “Hey, lets put up an educational FM station.” The school said “get the license and we’ll fund the project.” We said “we need the money to get the license.” The infamous “Catch-22”.
So we went ahead and built a studio complete with two turntables, a mixer, mics, etc. When we couldn’t get the school to fund us we used an Eico Signal Generator and got on the AM band.
We had T-shirts made with the logo “WCFO – The Station That Rocks 3 Blocks”. The students loved it and we rocked 3 blocks. And, it was still a great learning experience for the students.