The weak signal CW recordings on AB7E's website are well worth a few minutes to listen to. His recordings clearly demonstrate -- much more convincingly than any other demo I've ever heard-- the significance of one dB of improved signal strength and the cost of sending too fast under weak signal conditions
http://www.ab7e.com/weak_signal/mdd.html My takeaways from his recordings: - its well worth the effort to improve your signal by as little as one dB - when signals are very weak, sending faster (especially at speeds faster then than 30 WPM) costs the equivalent of many dB of reduced signal strength. If you haven't already clicked on AB7E's webpage, these are direct links to several of his recordings. A weak CW signal buried in noise with the signal strength decremented in one dB steps, http://www.ab7e.com/weak_signal/6_5_4_3_2_1_0_db.mp3 Two weak CW signals buried in noise -- slightly offset in frequency -- with one signal one dB stronger than the other: http://www.ab7e.com/weak_signal/A_vs_B_1db_v1.mp3 http://www.ab7e.com/weak_signal/A_vs_B_1db_v2.mp3 Two weak CW signals buried in noise -- slightly offset in frequency -- with one signal two dB stronger than the other: http://www.ab7e.com/weak_signal/A_vs_B_2db_v1.mp3 http://www.ab7e.com/weak_signal/A_vs_B_2db_v2.mp3 CW signals sent at 20, 25, 30 and 35 WPM when buried in noise. http://www.ab7e.com/weak_signal/A_vs_B_2db_v2.mp3 73 Frank W3LPL _________________ Topband Reflector Archives - http://www.contesting.com/_topband
