The way the different contest exchanges are implemented in WSJT is confusing and has been discussed many times.
Users has to select "EU VHF" if they are in a HF contest requiring either a serial number and/or the full 6-digit locator. Trying to use a particular contest exchange may resulting in a window at the other station "Do you want to change to xxx mode". As WSJT in this situation can display a window, WSJT might just as well just change to that mode and send the needed exchange. I suggest the labeling on the Settings page regarding contest "modes" is split into several saying: "I need an exchange with serial number" "I need an exchange with your 6-digit locator" "I need an exchange for NA fieldday" When a station calls CQ with some of these options set, WSJT in FT4/8, MSK144 or Q65 of the answering station should automatically transmit the requested exchange without flashing a confusing window about a particular contest mode. The logic should be that you request the exchange you need and you get it without intervention from the other station. This should keep all happy and one only transmits the exchanges needed by the other station. Btw FT4/8 is not well suited for VHF, as everyone is QRM'ing each other on the same frequency. FT8 does not even play well with aurora, but few knows what they at not decoding. Q65 is developed for VHF and up and MAP65 can find all Q65 signal within about 200 kHz enabling all stations to spread out and use more of the band (use it or loose it). Perhaps Q65 will work well on HF too? To be widely accepted for more than EME Q65 should be enhanced with 7.5 and perhaps even 3.75 sec sequencing. In many cases speed beats sensitivity and Averaging helps increasing sensitivity to some extend by adding several short periods together. Most WSJT QSO's are done many dB above the minimum sensitivity. Also Q65 should by default use a setting (sequence and A-E) suited for the band in use. In case someone wants to try other than the default settings they could be changed in Advanced settings. 73, Palle, OZ1RH.
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