Radio Waves International Relay 28th of June 2020 1800 Utc 3955 Khz Radio Waves International Relay 28th of June 2020 1800 Utc 3955 Khz. Info via Twitter Share this: Share on X (Opens in new window) X Share on Facebook (Opens in new window) Facebook Email a link to a friend (Opens in new window) Email Print (Opens in new window) Print Related