After the final prisoners left Cork gaol when it closed in 1923, the prison lay empty and derelict for four years, when a radio station was established in the east wing of the abandoned institution. Ireland's first radio station, 2RN, began broadcasting form Dublin in January 1926, but the signal was often weak in areas far from Dublin, so a Dáil resolution, encouraged by the Minister for Posts and Telegraphs, J.J. Walsh, was passed in 1927 which allowed for the establishment of a radio station (to be called 6CK) and transmitter in Cork to act as a relay for the national programme from Dublin and as a contributor to the new service by producing programmes from the city. The proposal to open a relay station so soon after the opening of the national service, at a time when the economy of the fledgling state was severely stretched following the exhaustiveness of the War of Independence and the Civil War less than a decade prior, drew much criticism from the Department of Finance. The government persevered, however, with Walsh eager to extend the new service to the second city. That he also happened to be a TD for Cork city possibly hastened the rolling out of the relay service.
The first station director of 6CK was Sean Neeson, a graduate of Queen's University, Belfast who had an existing knowledge of the old gaol's interior, having been detained there as a political prisoner by the Free State government during the Civil War.

The radio exhibit starts with a look at the earliest days of radio technology, such as the development of Morse code and an explanation of how sound waves work. This is followed by an exhibit on Guglielmo Marconi, or is supposed to be, this part of the exhibit was not working, nor was it working during my first visit nearly two years ago.
The museum holds a significant number of pieces of equipment used by broadcasters, including a microphone and stand used by John F. Kennedy on his visit to Ireland in June 1963. The microphone and stand were owned by Radio Éireann (as it then was), and were "retired" from service by Paddy O'Connor, a technical supervisor with the Cork relay station after their use by Kennedy on the day he received the freedom of Cork city on Friday, June 28, 1963.
From here, you can see the studio used by 6CK and Radio Éireann, with the small performing area for whatever programme was being broadcast, and the producer's desk outside the studio, with the control panel and the telephone at hand, next to a waxwork figure of a producer. On the wall next to this scene is a display featuring a 1920s map of the world from the United States, listing a number of short wave radio stations from around the globe and explaining how short wave radio works. There are a number of short wave radios under this map, placed to allow people to search for short wave stations today, though sadly these radios did not work, either on this visit, or on my prior visit to the museum.
The next display is that of a myriad of radio sets from numerous countries, made at different times of the twentieth century. If you love old radios, this is probably as good as it gets, with expensive vintage table-top sets of the 1930s mixed with cheaper, mass-produced Bakelite sets of the 1940s, and the popular transistor radios of the 1950s and 1960s. In addition to the sight of these vintage radios, the display incorporates an audio gallery, featuring various news items and entertainment programmes as they heard from the first few decades of radio broadcasting. Broadcasters from America, as well as the BBC and from 2RN/Radio Éireann are heard, encompassing the likes of the Hindenburg disaster, the infamous Hitler declaring Germany to be a country of "one people, one nation, one leader", Edward VIII's abdication message, Franklin D. Roosevelt speech to Congress after Japan's attack on Pearl Harbour, Harry Truman's confirmation that an atomic bomb had been dropped on Hiroshima, as well as lighter events such as Orson Welles' assurance to the American public that "The War of the Worlds" was not a real news story, and performances by Elvis Presley and The Beatles.
The final part of the exhibit is the RTÉ collection, which features pieces of technology used in Irish radio's earliest days, such as portable amplifier and mixer unit used by legendary broadcaster Michael O'Hehir for his GAA and horse racing commentaries, and a ribbon microphone used by Radio Éireann from 1948 to 1957, similar in nature to microphones still used by RTÉ and the BBC today. Also shown are copies of the front covers of popular radio magazines from the 1970s and 1980s, with the RTÉ Guide featuring prominently.
Overall, I enjoyed the radio museum. It feels like having a personal museum, as this exhibition is more hidden than the main gaol exhibition, and doesn't appear to be as popular as the gaol. Perhaps this lack of activity from the general public explains what is a source of great disappointment to me, which is that a number of displays don't work, and clearly haven't for a couple of years. The Cork city gaol website says it houses "two special visitor attractions", but it's clear that one attraction is promoted more than the other, which is a pity. While I recognise that most people would be far more interested in the gaol and the social history it provides, I would like to see more of an effort to bring the radio exhibit back to a level it was clearly at a few years ago, because continuing to let displays break down won't help, and the day might come when we lose one of those "two special visitor attractions" because of neglect, and that would be a travesty.