### 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 operating location and optionally a Callsign Certificate.

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

- 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

When you start TQSL, it will check each existing Callsign Certificate and mark any expired entries on the Callsign Certificates tab with an expired icon . If internet access is available, TQSL will also check the validity of each existing Callsign Certificate with LoTW, and mark any obsolete entries on the Callsign Certificates tab with a replaced icon ; this over-the-internet check is made no more than once each day.

##### 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
- Log in to your LoTW Web Account to View your QSOs and QSLs
- Check for Updates to TQSL

##### Secondary Callsign Certificate Operations

- Viewing a Callsign Certificate's Properties
- Determining When a Callsign Certificate Expires
- Renewing a Callsign Certificate
- Replace a Callsign Certificate
- Determining if a Callsign Certificate is Valid
- Maintaining Callsign Certificate Security
- Copying Callsign Certificates from One Computer to Another
- Saving a Callsign Certificate to a File
- Loading a Callsign Certificate from a File
- Requesting an Additional Callsign Certificate
- Accepting an Additional Callsign Certificate
- Deleting a Callsign Certificate
- Restoring a Deleted Callsign Certificate

##### Secondary Station Location Operations

- Defining, Modifying, or Deleting a Station Location
- Restoring a Deleted Station Location
- Copying Station Locations from One Computer to Another

##### Configuration Operations

- Checking and Updating TQSL's Configuration Data
- Setting TQSL Options
- Setting TQSL Log Handling Options
- Setting a Date Range
- Adding and Deleting ADIF Mode Mappings
- Adding and Deleting Cabrillo Contest Definitions
- Configuring a Network Proxy for Internet Access
- Selecting the Language Used by TQSL
- Localizing TQSL

##### 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
- Define custom Cabrillo modes