How to distinguish when a DXpedition uses FT8 Fox/Hound (F/H) mode
 and when it uses Multistream (MSHV)

I often see questions of many operators in the chats, mailing lists, WhatsApp groups, etc. requesting whether a certain DXpedition is using FT8 in Fox/Hound or using the Multistream feature provided by MSHV.

Unfortunately I also often see many answers from other operators that are not correct !

IMPORTANT: Due to recent changes in the implementation of the Multistream in MSHV, it is now impossible to distinguish it from Fox/Hound just seeing the transmissions of the DX station. In former versions of MSHV it was possible and here it was explained how to do it.

The new MSHV implementation of Multistream:

With this "confusion" created by the new implementation of the Multistream in MSHV you will have to relay on the information provided by the own DX operators in order to know whether they are going to use Fox/Hound or Multistream during their operation. There is no way to do it just watching to their signals/messages.

Some important considerations:

So is it better for DXpeditions to use the WSJT-X in Fox mode or to use the MSHV in Multistream mode?

The answer is not simple and depends on each case, but the latest implementation of the Multistream in MSHV will possibly have more advantages than disadvantages. Anyway let's discuss the advantages and disadvantages of each:

WSJT-X in Fox mode:

MSHV in multistream mode:

IMPORTANT: In no case, under any circumstances, should the FT8 standard frequencies be used, neither for Fox/Hound, nor for multistream.

You could also be interested to read the articles "How to make good enemies in FT8 / FT4" and "How to make a QSO in FT8 Fox/Hound (F/H) mode"

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