For your records to be marked as Sent to LoTW in AC Log (L in the Sent Confirmed By field), the following criteria must be met:
1. Your records must be successfully uploaded to LoTW.
2. Your records must be successfully downloaded from LoTW
3. The callsign must match the call of the station worked.
4. The band must match the band of the station worked.
5. The date and time in AC Log must match the date and time on the LoTW record.
Note that to speed processing, once AC Log finds a match, it doesn't continue searching your log for more matches, so if you have two or more contacts with the same station on the same band at the same time (such as working county line stations in a state QSO party), only one of the QSOs will be automatically marked.? When that occurs, just edit the unmarked contact and mark it manually.
If you continue to have trouble, click the option to display raw data on AC Log's LoTW form when you do the download.? If the QSOs are not included in the download, the LoTW server is not providing them.? If they are, but they are not updating in AC Log, see the data for the specific QSOs that the server provided and determine which of the above criteria is not matching.? More details on this trouble shooting method are here:
And additional helpful details are here:
Enjoy!
