The following message was posted to UDXF by Daniel, LU5EMM and lists a number of MW and HF channels. All radio operators and vessels are requested to keep watch for missing submarine ARA San Juan.
ALL RADIO COLLEAGUES AND / OR VESSELS ARE REQUIRED TO BE ATTENDED TO ALL THE FREQUENCIES OF EMERGENCY CALLING BY THE CREW OF THE SUBMARINE "ARA SAN JUAN", WHICH IS UNCOMFORATED SINCE DAY 15/11 / 17 Frequencies in TELEPHONY and TELEGRAPH. 2065.0 kHz 416 kHz 2182.0 kHz 437 kHz 3023.0 kHz 500 kHz 3860.6 kHz 4239,5 kHz 4125.0 kHz 4304,0 kHz 4143.6 kHz 8447,0 kHz 6218.6 kHz 8528.0 kHz PLEASE SHARE / SPREADIt is also recommended to watch 4340.0 kHz, this being the transmission frequency for "type 0050" and similar Indicator Buoys. However it is not known if San Juan was equiped with a buoy of this type.