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Yaesu FT-991 Winlink Express | Mark Dallner
There seems to be an issue with documentation with/for using the SCS Pactor modems and RMS or Winlink Express.

Information on this page will be updated as I learn more. Last update 2020/01/21 02:40 UTC

There are videos showing the connection process with no how to set up Winklink for the Pactor Session.

Here is what I have found

Station configuration:

FT-991a, LDG-YT-1200, SDRPLAY RSPII, Radio Wavz inline RF isolation transformer and a Comet CHV-5x with the L3.5 coils added. I removed the 21 MHz coils. And the SCS PTC-IIIusb

Computer is a Windows 10 box with 18 Gigs of RAM and a 1 TB HD. Still a spinner.

Settings for the FT-991a that are not default

27: Time Zone -6
28 GPS/232C SELECT; 232C
29 232c RATE: 38400 bps
31 CAT RATE: 38400 bps
62 DATA MODE: OTHERS
141 TUNER SELECT: EXTERNAL ( for YT-1200)

In the F M-List settings
DT Gain 45 (the same setting from my FT-817/57/97 radios? Starting point?)
WIDTH 3000 HZ (page 52 in the Manual)

The WIDTH setting is band specific. Change Bands, check the WIDTH setting.

RF output 45-75 watts

RF gain turned all the way up and Squelch open.

In WinLink Express Pactor Session:

TNC Setup

TNC PTC-IIusb, (I have the PTC-IIIusb)
TNC Serial Port Com 7, (my compooper)
TNC Serial Port Baud Rate: 38400, (Make sure the com port setting in Windows matches?)
PSK Level 450
FSK Level 350 ( still working with these levels)
TX Delay (milliseconds) 30
Mac Pactor Level 3

Radio Setup

Select Radio Model Yaesu FT-991/A
USB radio button checked NOT USB Digital
Serial Port to Use: Com5, (Enhanced Serial Port on my compooper)
Enable RTS checked
Enable DTR checked.

Make sure you don’t have any DSP or noise reduction enabled on the 991A. The modem has very powerful internal DSP and you don’t want to double up.

And one final note on ALC meter reading, It is in the RED +2. When I turn it down so that it is below the RED zone, I do not get connections.

Got feedback from Gary Wood of Farallon.US. Don’t worry about the ALC reading. The Pactor signal is totally different than a SSB or CW signal and the ALC reading is meaningless.

And one item that helped was I re-flashed the firmware.

It was brought to my attention to update the propagation tables on a regular basis under channel selection. I do this each time I bring up a session, VARA, Pactor, ARDOP, out of habit.

Thank you to the Winlink io group, Gordon Gibby, KX4Z, Gary Wood, at Farallon.US & Howard Evans, W6IDS for on going conversations and encouragement. Always great to have connections in the HAM community!