On 17 March, The Mighty KBC, 7375 kHz via Germany, transmitted PSKR250 (220 wpm) centered on 1000 Hz, and MFSK64 (240 wpm) on 2000 Hz. The PSKR250 decoded less than 100% successfully, but the MFSK64 was flawless. Reception in northern Virginia (hear the audio) was on a $30 analog-dial portable with whip antenna.

The previous week on the Mighty KBC, the results were the same, even though the audio frequencies were reversed. So the factor was the mode, not the audio frequency.