Did they have portable radios in the 30s?

Yes, the first portable radio was invented in the 1920s, and by the 30s they had become more widespread and affordable. The first portable radios were often called "pocket radios" or "personal radios," and they were typically powered by batteries. They were a popular way to listen to the radio while traveling or working, and they helped to make radio more accessible to people in rural areas who did not have access to electricity.