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FLARQ, also known as Fast Light Automatic Repeat reQuest, is a software utility that works in conjunction with the Fldigi application. FLARQ is designed to enhance the reliability of data transmissions over radio by implementing an automatic repeat request (ARQ) protocol.
The ARQ protocol is a mechanism used to ensure error-free data transmission in the presence of noise, interference, or weak signal conditions. It involves the automatic retransmission of data packets that are either corrupted or lost during transmission. This process continues until the packets are received correctly or until a predefined number of retransmissions is reached.
FLARQ integrates with Fldigi to provide a robust ARQ capability for digital communication. It enables reliable exchange of text messages, files, and other data over radio frequencies using various digital modes supported by Fldigi.
Here's a brief overview of how FLARQ works:
1. Data transmission: Fldigi encodes the data into the chosen digital mode and transmits it over the radio using the computer's sound card.
2. Reception and verification: FLARQ running in FLdigi's ARQ mode receives the data and verifies its integrity by performing error checking and correction.
3. Acknowledgment and retransmission: If errors are detected, FLARQ sends an acknowledgment signal to the sender, requesting retransmission of the corrupted or lost data packets. FLARQ also keeps track of the sequence of packets to ensure proper order upon reception.
4. Retransmission process: The sender, upon receiving the acknowledgment, retransmits the requested data packets until they are successfully received by the recipient. The process continues until all data packets are error-free or the maximum number of retransmissions is reached.
FLARQ significantly improves the reliability of digital communication by automatically handling errors and ensuring the successful delivery of data. It is particularly useful in amateur radio applications where signal conditions may vary, and reliable transmission is essential.
See the Flarq web site for more information.