### Clarifications on WSJT-X Fox Mode
1. **Fox Mode**: The Fox in Fox and Hound mode (F/H) is a feature exclusive to WSJT-X.
2. **Frequency Operation**: The Fox cannot operate on a standard frequency.
3.
**Transmission Timing**: The Fox always transmits at the start of the even minutes (00/30, 1st) .
4. **Multi-Threaded Split**: The MSHV software allows for split (multi-threaded, multi-stream) operation on a standard frequency.
5. **Operational Flexibility**: MSHV can split (multi-threaded, multi-stream) on either even or odd frequencies since there are no restrictions on the duration of operation.
6. **Difference from F/H**: Since MSHV does not operate in Fox and Hound mode, there is no requirement to call above 1000 Hz or include a grid locator in your transmission.
To clarify, there is no need to shift to the designated frequency (DF) where the callback was initiated, even if the other station is operating in WSJT-X Fox mode. This means you can make a QSO with a station in WSJT-X Fox mode while calling it in standard mode, provided that your call is made above DF 1000 Hz. In essence, regardless of whether the your software is in Hound mode, you can initiate a call using Tx1 above 1000 Hz then you will have a callback.
It cannot be concluded that the other party is MSHV simply because a QSO was established by calling a WSJT-X Fox mode station in normal mode, without knowledge that the station was operating in F/H mode.
The key point is that if the other station is using EVEN and you were able to make a QSO by calling below DF 1000 or by calling with a report, you can then designate the other station as MSHV.
Conversely, if the other party is on ODD and splitting, it can be regarded as MSHV from the outset.
Some operators confuse F/H and MSHV with calling methods. F/H is a DXpedition-specific mode in WSJT-X that allows callers to make contacts (QSOs) with or without setting the Hound option, but they must always call above 1000 Hz. On the other hand, MSHV refers to software that supports multi-stream operation, which is similar to F/H but not the same. Unlike F/H in WSJT-X, there are no restrictions on calling frequencies for stations using MSHV.
This means you can call anywhere or start your call with a report from the beginning.
I often come across posts stating “MSHV was OK” or “Called by MSHV,” but it shows a lack of understanding. However, it doesn't matter as long as you can make a QSO.
Some people believe that when they receive a callback from a station operating in WSJT-X Fox mode, they are “pulled” into the frequency where the callback originated. However, this is actually the software in Hound mode that is automatically jumping to that frequency, rather than the other station controlling it.
It is NOT CONTROLED by the other side.
Note that not only WSJT-X can be set to Hound mode, but also JTDX can be set to Hound mode.
As mentioned above, you do not need to set Hound mode to call a WSJT-X Fox mode station. However, the software operates differently when it receives a callback. If Hound mode is enabled, the software will jump to the other station's frequency and send a response. On the other hand, if Hound mode is not enabled, the software will remain at the frequency where the call was made and will respond from that same frequency.
If the call frequency is above 1000 Hz, a QSO is possible even if your software is not set to Hound.
If the other station sends "RR73" and your software is in Hound mode, it will not respond with "73." However, if it is not in Hound mode, it will reply with "73" without changing the DF.
When calling WSJT-X Fox mode operating stations, always transmit your call above 1000 Hz using Tx1, along with your Grid information.
To avoid issues caused by potential frequency deviations in the other station's equipment, it is advisable not to call a station very close to 1000 Hz. If the other station does not recognize your call as being above 1000 Hz, you may not receive a response.
If the other station is using SDR (Software Defined Radio) equipment, the frequency they receive may be wider than 3000 Hz. If you are not receiving callbacks, it might be helpful to call above 3000 Hz. Occasionally, you can find information about the other station's equipment on their website, but this information may not always be reliable.
If you suspect that the other party's software is MSHV, consider abandoning the Hound concept and calling below 1000 Hz or at a frequency lower than theirs.
I believe this approach may increase your chances of receiving a callback, rather than assuming the other party is operating as a WSJT-X Fox and clustering above 1000 Hz, which can lead to mutual interference.
However, please use your own judgment in this matter.
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