3 ms·
The key would be the lack of interference, both from electrical noise and from other stations. Radio Amateurs are even today communicating world wide on the 63
by Johnythree 3y ago
The key would be the lack of interference, both from electrical noise and from other stations.
Radio Amateurs are even today communicating world wide on the 630m MF band using much lower power and very modest antennas.
- wglb 3y agoYes, however, they are likely using new techniques such as WSJT and related modes, that have the capability to receive many tens of DBs lower signals.