Digimodes
The UHSDR software supports three digimodes (FreeDV, RTTY, and CW) at the moment.
Work is underway to implement some more modes.
Common for all digital modes (except for CW decoding, see below):
•
Once only: enable "Digital Modes" in Standard Menu
•
With touchscreen
o
touch on blue box "DIGITAL" --> changes to orange and displays the
digital mode
o
to switch to other digital modes touch box again
•
With menu (no touchscreen)
o
Go to "Touch via menu" Menu
o
Select desired "Digital Mode"
o
Leave menu mode
o
The blue box should show the desired digital mode.
o
Now switch to digital mode using the Mode button (G1). The blue box
switches to orange and digital mode is active.
Implemented modes:
FreeDV (Rx & Tx)
How to operate
•
select digital mode "FREEDV" as described above
•
bla bla bla
Theory
FreeDV is a digital voice mode designed for reception and transmission of voice on the
HF bands. It uses a low bitrate voice coder-decoder (Codec 2) which is in the public
domain (licensed under the GNU GPL). Decoding voice is possible down to signal-noise-
ratios of 4dB. We are grateful to David Rowe for writing the source code and putting it
into the public domain and also for answering questions and helping with design
