On Tue, Nov 20, 2018 at 7:41 AM Stephen Ireland <vk3...@hotmail.com> wrote:
> 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 10 > th December? > > > > Yes I can fully see the consequences – and hence chaos – that this may > create. > > > > 73 > > > > Steve I > > VK3VM / VK3SIR > > > > > > > > _______________________________________________ > wsjt-devel mailing list > wsjt-devel@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/wsjt-devel >
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