PY5LF pointed out that the DTMF grid uplink has been working fine on PSAT2, and generating QSO numbers, but that the QSL response so people can make two-way contacts was not working.

That was because we did not have DTMF Messaging enabled. The QSL response is a message and so we enabled that this morning.

To QSL a GRID QSO number you simply send back a message #40 with his QSO number to complete the exchange. See the other 90 or so DTMF messages on PSAT2:

http://aprs.org/psat2.html

Bob, Wb4APR