Ed,

There is a strange anomaly that makes no sense yet many of us that (especially) 
work weak DX observe frequently ... Sometimes when you end up in a R -XX/RR73 
loop ("RR/73 loop" or "ACK dance" as you term it) with a station anecdotally 
and observationally sometimes sending 73 sequences back manually appears to 
break the loop-cycle. 

Why ? it makes no sense when logic is analysed or informed thought is applied 
to the observation.

Note that it is not restricted to Weak DX - but is more often observed when 
both ends have desperation to complete the QSO.

Yet from my direct observation, experimentation and simulation conducted a 
couple of back (when on "down time" with research that I was on - and using 
earlier on earlier FT8 releases and the "main fork") it is able to be 
replicated - yet inconsistently. 

There are "theories" that if the data stream is changed slightly then QRM/QRN 
effects that interact with signals passed over the decoder can change and 
therefore decoding impasses can be broken ...

More likely the observation is just a statistical/probability anomaly. Yet some 
Amateurs SWEAR by this method to break impasses; I also admit that I have often 
found it to be observationally useful operationally to break a RR/73 loop !

A "revert and hold" over-ride over Tx4 sequencing when Tx5 is selected may be 
useful. Yet without mathematical or statistical justification for it - just 
observation and anecdote - it will be hard to convince the core developers of 
mitigation strategies that can and will consume valuable signal processing 
resources.

73

Steve I
VK3VM / VK3SIR

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