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To configure the stationary TT4 as a digipeater,

Connect the TT USB cable to the computer and install drivers if needed
Run a terminal program such as TeraTerm Pro and set it for 19200 baud
Connect the TT USB cable to the TT4 J2 DB-9
When prompted to press ESC 3 times, do it quickly to enter the command menu
Enter the following commands
RESTORE < this puts everything back to DEFAUT >
MYCALL <your callsign>
ALIAS1 WIDE1 (or WIDE2, or WIDE)
and set the audio levels to match your radio (TXLEVEL, TXTWIST, RXA, CALIBRATE, and MONITOR commands, plus the R1 pot.)

If you also want the unit to transmit its location, then set:
TSYMC #
PPER ?3600
LOCATION <your location> (Must match format exactly)
TOSV N
PATH1 WIDE2-2
PATH2 %

To convert your lat/long from decimal degrees like DD.dddddd just use the 2 digits (for the first number, 3 for the second) before the decimal, then multiply the .dddddd by 60, and put that after the DD with 2 digits, decimal, then 4 digits after the decimal.

To use calibrate, enter CALIBRATE and press enter. Use this command to adjust and test the transmit audio levels. While calibrating, PTT is activated and audio tones are sent to the radio. Use the L transmit the low tone, H to transmit the high tone, B to transmit both tones, alternating every 833us, and S to transmit both tones, alternating every 6ms (helpful to adjust twist with a scope). Use 1 & 2 to change overall tone levels, 3 & 4 to adjust twist (high tone vs. low tone), and Q to quit calibration.

I hope that helps.?

Byon