The FT-991A is all mode, all band MF/HF/VHF/UHF transceiver with C4FM (System Fusion) Digital capability. The FT-991A includes multi-mode operation on CW, AM, FM, SSB, and Digital Modes (Packet, PSK31, RTTY and C4FM), with 100 Watts of HF/50mhz Capability (50 Watts VHF/UHF).

The has a high-resolution full color 3.5“ TFT touch panel, incorporating a High Speed Spectrum and High Resolution real-time scope.

The FT-991 can be connected to a computer using a USB cable for CAT control and firmware updates, or the use of an integrated SCU-17 Interface Unit to support USB Audio In/Out, TX Control (PTT, Key, Shift).

The FT-991A has an in-built automatic antenna tuner.

Report from Simon M0XLZ is that he successfully uses NinoTNC with FT-991A to connect to GB7IOW over 300 baud HF packet (IL2P).

Settings on the radio are:

• mode: data-usb
• dial setting of 7.04575 (for GB7IOW)

On the F button:

• DT Gain 60
• Shift +200hz
• Width 500hz (NB see note below)

On the Menu button:

• item 073 Data Out Level at 80

The received signal needs to be at least 3 S points over the noise floor.

If you set the width at 500hz the filter slope starts to cut off at about 1700hz which is no good. The shift moves the centre point of the filter up 200hz, the filter gets rid of any AGC reduction from powerful neighbouring signals, like the bottom end of FT4. I only found out by using Fldigi to monitor the signal in the waterfall. Another thing that may help is that I have menu items 064 and 065 set at 1500hz.

And data mode set to others (menu 062)

The FT-991A’s USB interface can be used for packet radio, with the caveat that it cannot be used for 9600 baud. See https://sourceforge.net/p/fldigi/wiki/FT991A_9600/