Trying to avoid anxiety in supercold weather, I’m browsing through 1936 issues of Broadcasting magazine. Ran into a totally unfamiliar technology in a totally familiar location!
W9XBY in downtown KCMO. At first I thought this was the well-known experimental TV branch of KMBC. It’s the same company in the same building, but different call letters and a different experimental technology.
W9XBY was operating at the top of the regular broadcast band. The last 100 kc from 1500 to 1600 were opened later than the rest, and still relatively unoccupied in the ’30s. This station was centered at 1530, and used a double-wide bandwidth for high fidelity AM. Oddly they were emphasizing sports, not music.
Here’s more info on both of the National experimental stations.
I’ve been involved in radio for 60 years. In the 1980s I taught at DeVry, the descendant of First National’s training school. Despite all the familiarity, I’ve never heard of this technology!
Polistra's Mill 