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Dear Mr. Vlarth,
Thank you for posting your request on History Hub!
We searched the National Archives Catalog and located the U.S. Information Service, Budapest, Hungary Subject Files, 1945 - 1948 in the Records of the Foreign Service Posts of the Department of State (Record Group 84) includes 15 file units that may include information about the broadcasts you seek. We also located the Office of Eastern European Affairs series titled Records Relating to Hungary, 1941 - 1977 in the General Records of the Department of State (Record Group 59) that includes a file unit titled Hungarian Legation Radio Transmitter. For access to and/or copies of these file units, please contact the National Archives at College Park - Textual Reference (RDT2) via email at firstname.lastname@example.org.
We hope this is helpful. Best of luck with your research!