Originally Posted by
ValMORNA
In the 'good old days' shipping used 500KHz as a calling frequency but at h+15 and h+45 there was a 'Silence Period' for 3 minutes to ensure any distress traffic could be passed without hindrance and guaranteed(?) reception. Somewhere in the recesses of my mind is mention of another frequency on the lower end of 4MHz which was reserved for 'Sub Sunk' and 'Sub Smash' auto distress (I think - rather vague now).
4340 Kilohertz : NATO Combined Submarine Distress frequency
The following request is being shared on radio forums.
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 / SPREAD
https://www.facebook.com/aguaseguras...type=3&theater