On 05/04/2016 16:15, George J Molnar wrote: > A modest proposal to shorten JT-mode QSO’s without compromising their > integrity or cadence. > > Example: > CQ KF2T DM25 > KF2T KX7XX -16 > KX7XX KF2T R-12 > KF2T KX7XX 73 > KX7XX KF2T 73 Hi George,
Sending the "dx-call de-call grid" to reply to a CQ call is necessary for several reasons. Firstly the grid is useful as it forms a check that the decode is not garbled, for example a call with a grid that is not in their country is obviously a false decode. Secondly the grid is important when a station is not operating from their home QTH, for example portable. Thirdly the main intent of this message is to confirm that a call has been received which is essential before continuing with reports. This last point may not seem obvious but consider when the QSO is a sked, the original caller knows to start sending his report once the grid message is received. In general using one message to both confirm received information and to pass new information is implicitly ambiguous. The one exception to this is possibly using RR73 to confirm reports received two way and sign off, but that is only the case because the implied 73 and sign off is not required anyway - see the next para.. Dropping the RRR message does not shorten a QSO, all you have done is substitute the acknowledgement of the running station's receipt of a report with an ambiguous 73 message. The ambiguity is that a station may choose to give up due to not receiving his report (mycall hiscall R<report>) by sending a 73 implying "thanks for trying but no copy 73". Sending an RRR message absolutely confirms that a R+report message has been received, the other station sending a 73 is a confirmation that the RRR has been received and the QSO is two way. It is important to remember that this protocol is designed for weak signal working where many repeats are often necessary and the QSO progress must be confirmed both ways at each phase of the QSO to move on to the next phase. Just because the bulk of HF QSOs are completed without repeats is more a sign that too much power is being used than any fault with the protocol! This last point is particular relevant as the JT sub-bands become more popular, if everyone reduced power to near the minimum for their QSOs then we would all be able to make more QSOs rather than blocking the band for others. 73 Bill G4WJS. ------------------------------------------------------------------------------ _______________________________________________ wsjt-devel mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/wsjt-devel
