73 Lf

摘要

On page 45 this month is a descrip-tion of the technique used for the record-breaking 393km one-way 73kHz QSOon 13 July when Peter Martinez, G3PLX, received extremely slow Morse from Andy Talbot, G4JNT, as described in the September column. This mode is especially useful at LF because of the relatively stable paths compared to higher frequencies; it is also a band where extremely good oscillator stability can be achieved.