Folks, I realise that Joe K1JT has recommended that for 2.0 RC4 that we should be transmitting above 2000hz in offset.
Many of us have radios (i.e. non-SDR’s such as Yaesu’s and Pre-SDR-based Icom’s) that have known “performance curves” – even at digital settings - meaning that AF/sound fed to or taken from our radios below around 500 Hz and above around 2200Hz are not reproduced in a “linear fashion” by our radios . This is evidenced by the way that to maintain constant output power across the entire usable spectrum one must “adjust” the AF “Power” drive control as one shifts Tx frequency. Some of us are in so called “far away places” to prime development environs and have what some will call compromised antenna systems i.e. wire. There is considerable anecdotal discussion on backchannels and “unofficial” forums that FT8v2 is not performing as well as FT8v1 on congested bands. I am swayed to the direction of this opinion at this stage – based upon the number of unsuccessful QSO completion attempts. My observed “unsuccessful” rate is in excess of 50% with v2. With v1 is around 10%. [ “Unsuccessful” definition is that the QSO cannot get beyond the RRR state and that the QSO must be aborted ]. Yes there are far more transmitting v1 than v2. I am not prepared to make definitive judgement at this point ... especially without more FT8v2 QSOs ... remembering the once highly respected Fleishman and Pons and their final collaboration ! Perhaps more experimentation is needed now below 2000 Hz-in-offset across all bands i.e. where everyone is Tx’s above everyone, stations ignore the “Tx on 50Hz” conventions and hence transmit partially over other stations, and the general chaos of AR rules etc... before V2 goes fully live on the 10th December? Yes I can fully see the consequences – and hence chaos – that this may create. 73 Steve I VK3VM / VK3SIR
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