Have a look at VARA.
It is a new Milspec digital mode adjusted for the U.S. HF (or VHF) ham bands.
Meaning it satisfies all the current FCC legal requirements for HF digital.
< 300 baud, < 2.4 KHz bandwidth.
52 Carriers in orthogonally spaced subcarriers.
Multiple OS platforms.
Thruput speeds comparable with P3…..
Full Winlink functionality using the Winlink Express radio email client in Telnet mode.
“VARA is a High Performance HF modem based on OFDM modulation. VARA Modem,…[su_button url=”https://forums.qrz.com/index.php?threads/vara-hf-digital-mode-for-winlink.599833/”]Full Original Article[/su_button]