| Main | 
| Number 
 | Title | Status | Questions | 
| P.1321-5 (07/2015) 
 | Propagation factors affecting systems using digital modulation techniques at LF and MF | In force (Main) 
 | 225/3 | 
| 
 | 
| Previous versions | 
| Number 
 | Title | Status | Questions | 
| P.1321-4 (09/2013) 
 | Propagation factors affecting systems using digital modulation techniques at LF and MF | Superseded 
 | 225/3 | 
| P.1321-0 (08/97) 
 | Propagation factors affecting systems using digital modulation techniques at LF and MF | Superseded 
 | 225/3 | 
| P.1321-3 (10/2009) 
 | Propagation factors affecting systems using digital modulation techniques at LF and MF | Superseded 
 | 225/3 | 
| P.1321-2 (02/2007) 
 | Propagation factors affecting systems using digital modulation techniques at LF and MF | Superseded 
 | 225/3 | 
| P.1321-1 (03/2005) 
 | Propagation factors affecting systems using digital modulation techniques at LF and MF | Superseded 
 | 225/3 |