MRF Radio 3900 Khz MRF Radio is on 3900 Khz LSB-mode at 2120 Utc with SINPO 34433. Some QSOs with lower stations. Share this: Click to share on X (Opens in new window) X Click to share on Facebook (Opens in new window) Facebook Click to email a link to a friend (Opens in new window) Email Click to print (Opens in new window) Print Related