====== Yaesu FT-991A ======

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.

===== TNC cable =====

{{:packet:ft-450d_data_jack.png|}}

(taken from FT-450D manual)

| **Pin** | **Use**  | **NinoTNC / Kantronics pin** |
| 1       | TX audio | 1               | 
| 2       | Ground   | 6               |
| 3       | PTT      | 3               |
| 5       | RX audio | 5               |


A suitable cable can be made from a PS/2 extension lead, scrap PS/2 mouse or keyboard. Sometimes with the mouse/keyboard option, not all of the required pins are populated, so may not be suitable. Identify the pins with a multimeter (a croc clip lead is useful here.) Solder a DB9 plug on to the other end as above.

===== Packet Radio with NinoTNC =====


Settings on the radio for HF are: 

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

On the (F) button: 

  * DT Gain 10  (DT Gain is unique to each setup, monitor ALC - increase until you see ALC kicking in, then back off)

On the Menu button: 
  * 073 Data Out Level at 80-95
  * 062 Data Mode - OTHERS
  * Remember to set 108/109 back to DAKY/DATA if you've been using the SCU.

For legacy HF modes with a 1700 CF (Centre Frequency)

  * Menu 064 and 065 set at 1700Hz. (F) Width 500hz
     
For the new beta NinoTNC modes with a 1500 CF (500Hz Bandwidth)

  * Menu 064 and 065 set at 1500Hz. (F) Width 800hz    (500Hz does work though)


===== Packet Radio with soundcard modem =====

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

{{tag>radio packet hf vhf uhf 1200 9600}}