Yaesu FT-950 Recommended Interconnection Diagram

3-Conductor Phone Plug

Sleeve Ring Tip
Female DB-9 Plug (Pin #s Shown)
Optional Mix 77 or Mix 43 Ferrite Bead (6 Places)

CW OUT

CW GND CW Out Shield
To FT-950 Front or Rear Panel KEY Jack

NC = No Connection

To Ham Shack PC COM Port

FSK IN

See Note 4
Male 6-Pin Mini-DIN Plug (Pin #s Shown)

FSK OUT PTT IN PTT OUT

To FT-950 Rear Panel RTTY/ PKT Jack

DB9 Connector Shell

IN GND

See Note 5

FSK/PTT GND

In Shield

FSK/PTT Shield
FSK/CW Interface Board in Optional Metal Enclosure
Notes: 1. The connections shown above are based on available documentation and information from other hams, but have not been verified. Please use your own judgment before making any connections. 2. For CW, you must use a 3-conductor phone plug, even though the ring is not connected. 3. Make sure FT-950 RTTY menu items 060 (Transmit Polarity), 062 (RTTY Shift), and 063 (RTTY Tone) are set properly. Recommend settings are 060 = Normal, 062 = 170, and 063 = 1275 or 2125. The 1275 setting provides a more pleasant listening experience. IMPORTANT: Make sure that both your FT-950 (Menu Item 063) and MMTTY are set to the same mark frequency. 4. This connection made by mounting the board with metal standoffs or connecting the interface board mounting hole to the metal interface enclosure. You may also ground shields directly to the metal enclosure, if desired. 5. This connection optional. You may float the shield at the interface by leaving it disconnected and insulated from the metal interface board enclosure.