Yaesu FT-991 Manual

Setup of YAESU FT-991(A) for Soundcard Modems
The YAESU FT-991 with its built-in soundcard allows easy operation of
soundcard based digital modes like FT8, VARA, VARA FM, Packet 1200,
WINMOR, ARDOP. Just a standard USB cable is needed between a PC and the
FT-991. Rig control (CAT), PTT control and Audio In/Out pass on this single USB
cable.
There is one draw-back with the FT-991: The soundcard cannot be used for
Packet Radio 9600 or for VARA FM in wideband (‘9600’) mode. In fact, when
setting ‘Packet Mode’ in the FT-991 to 9600, the soundcard does not modulate
the FM signal. Direct FM Modulation can only be done via the RTTY/DATA
connector.
To setup the FT-991(A) for WINLINK Express and VARA or WINMOR, the USB
Driver fort the FT-991 has to be installed on the PC first. This happens
automatically as soon as you connect the FT-991(A) with the USB cable to your
PC when it is online.
You can check if the 2 COM ports and the soundcard are correctly found and
installed by checking with the device manager. You will find an ‘Enhanced COM
Port’ and a ‘Standard COM Port’:
If the driver is not installed properly, right click on ‘Enhanced COM Port’, select
‘Update driver’ and have the OS search for it automatically in the Internet.
The soundcard appears as a ‘USB Audio CODEC’ (Microphone and Speaker) :

Now open a VARA, WINMOR or ARDOP session in WL Express and select Radio
settings. Configure as shown (use the Enhanced COM Port as Radio Control
Port – in this case COM5):
In the menu of the FT-991 change the default settings oft he following items:
Menu #
Menu Function
Value
031
CAT RATE
38400
062
DATA MODE
OTHERS
064
OTHER DISP (SSB)
1500 Hz
065
OTHER SHIFT (SSB)
1500 Hz
066
DATA LCUT FREQ
100 Hz or OFF
068
DATA HCUT FREQ
3500 Hz or OFF
072
DATA PORT SELECT
USB
In ‘TNC Setup…’ of the WL Express session, do select ‘USB Audio CODEC’ in the
settings for the audio in/out devices.
IF you want to use your FT-991(A) for VARA FM (‘1200’) or packet radio, two
more items in the menu of the FT-991 have to be changed:
Menu #
Menu Function
Value
076
FM PKT PTT SELECT
RTS or DTR*)
077
FM PKT PORT SELECT
USB
*) This setting is used with UZ7HO soundmodem. It is not relevant for VARA
FM, which must be configured to use CAT.

To use the built-in soundcard for UHF/VHF, you must manually set the FT-991
to Mode ‘FM DATA’.
For VARA FM, the PTT setting is using CAT:
2019-08-20 / HB9AUR