These recordings are an impressive demonstration of the benefit of one dB of signal strength improvement in a weak signal situation.
Click on the links on this website: www.ab7e.com/weak_signal/mdd.html 73 Frank W3LPL ----- Original Message ----- From: "David Gilbert" <xda...@cis-broadband.com> To: elecr...@mailman.qth.net Sent: Wednesday, August 21, 2019 7:02:21 AM Subject: Re: [Elecraft] KPA500 Coax size requirements That's not a universally true statement. Several years ago I was trying to decide which antenna to buy, and my choice came down to two antennas that were 2 db apart. I created some audio files by recording typical band noise and then overlaying them with recorded CW messages at various strengths. The difference between 1 dB above the noise level and 2 dB above the noise level can make the difference between no copy and copy. The files and testing methodology can be found here: http://www.ab7e.com/weak_signal/mdd.html If you're ragchewing it doesn't matter, but if you're trying to make a contact and your signal is at the level of the mud it does. 73, Dave AB7E On 8/20/2019 9:18 PM, Jim Danehy wrote: > ONE DB loss is the LEAST DETECTABLE amount a human can detect. Hardly if not > impossible to notice. > > Jim > W9VNE/VA3VNE _________________ Searchable Archives: http://www.contesting.com/_topband - Topband Reflector