Note: images not updated to 4.3.1, all text applies
This version will only work with fldigi 3.10 or greater. Do
not attempt to use this version with earlier versions of fldigi.
Earlier versions of flarq cannot be used with fldigi 3.10.
uest is a file transfer application that is based on the ARQ specification
by Paul Schmidt, K9PS. It is capable of transmitting
and receiving frames of ARQ data via either vbdigi on Window, or fldigi
on Linux. The interaction
between flarq and vbdigi/fldigi requires no operator
intervention. On the Windows OS the
two programs exchange data and command sets using files that both
programs recognize. On the Linux OS the exchange is made using the
System-V Message Queue. This process is totally transparent to
user. The programs can be executed in either order. It is
only necessary that both be executing concurrently for the process to
The ARQ transfer must take place between two systems both of which are
running the flarq / fldigi combination. The ARQ specification and
the source code for flarq are GPL licensed. Other developers
wishing to duplicate or expand upon the flarq ARQ implementation may
freely do so.
Flarq can be used with the following digital modem as the transport layer:
BPSK all baud rates
QPSK all baud rates
MFSK all baud rates
DOMINOEX 11 or faster (do not use FEC)
THOR all baud rates, 11 or faster recommended
MT63 - all baud rates, flarq timing should be increased to accommodate mt63 latency
Please note that Olivia IS NOT compatible with flarq
transmissions. Olivia does not allow the transmission of the
control codes required for flarq.
Both a Windows and Linux executable are available as well as the source code are available for download.