### 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 your Callsign Certificate and operating location.

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

- Install TQSL
- 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
- Submit a Log File from a Computer without Internet Access
- Visit the LoTW web site to View QSOs and QSLs
- Check for Updates to TQSL

##### Secondary Callsign Certificate Operations

- Determining When a Callsign Certificate Expires
- Renewing a Callsign Certificate
- Requesting an Additional Callsign Certificate
- Accepting an Additional Callsign Certificate
- Moving Callsign Certificates and Station Locations from One Computer to Another
- Deleting a Callsign Certificate

##### Configuration Operations

- Setting TQSL Options
- Setting a Date Range
- Checking and Updating TQSL's Configuration Data
- Adding and Deleting ADIF Mode Mappings
- Adding and Deleting Cabrillo Contest Definitions
- Configuring a Network Proxy for Internet Access

##### File Operations

- Creating and Editing an ADIF File
- Backing up and Restoring TQSL Information
- Enabling and Disabling Diagnostic Mode

##### Additional Information

- Glossary of Terms
- LoTW Files and Icons
- TQSL Callsign Certificate Icons
- Invoking TQSL via its Command Line Interface