### Introduction

TQSL is an application used to digitally sign and upload QSOs to the ARRL's Logbook of the World (LoTW) online service, and to manage the Callsign Certificates used when digitally signing.

TQSL accepts QSOs in a log file whose format is either ADIF or Cabrillo, which many logging applications can export. TQSL also includes a simple QSO Data Editor that can be used to create and edit log files in ADIF format.

To digitally sign the QSOs in a log file, TQSL requires you to present a Callsign Certificate issued to you by the ARRL, and requires you to specify the location from which you operated when making every QSO in that log file. To make this easy, TQSL lets you define and name a Station Location that specifies:

- a Callsign Certificate
- a DXCC entity
- a Primary Administrative Subdivison (e.g. an Oblast, Province, or State)
- a Secondary Administrative Subdivison (e.g. a County)
- a Grid Square
- a CQ zone
- an ITU zone
- an IOTA Reference Number

This collection of information can be given a name that is presented to TQSL when uploading QSOs made with that callsign from that location. For an example, click here.

TQSL provides the ability to map modes not defined by the ADIF standard to modes that it can recognize, and the ability to specify information about less popular Cabrillo formats that it needs to properly interpret the QSO data in a Cabrillo-format log file.

When you start TQSL, it will inform you if

- a new Callsign Certificate you requested remains outstanding
- an existing Callsign Certificate will expire within the next 60 days
- a new version of Configuration Data file is available
- a new version of TQSL is available

##### Getting Started with LoTW

Before you can submit QSOs to LoTW, you must first

- request your Initial Callsign Certificate
- accept your Initial Callsign Certificate (using the same computer with which you generated the request for an Initial Callsign Certificate)
- define your Station Location

Then you'll be able to submit a Log File to LoTW via the Internet .