Operating UO-22 without a TNC

Created 23 September 2002

Uploaded 28 April 2003


With full acknowledgement to Don Woodward KD4APP for suggesting this method.


The story so far:



Radio Setup:

·                    Make sure the radio is setup for 9600bps filtering

·                    Use of the mic or speaker connections will not work!


PC Hardware Setup:

·                    Check that you are using line in & line out: mic in and speaker connections will have filtering which will make encoding/decoding impossible

·                    Check that your Null modem cable works: setup two Hyperterminal sessions and check that they talk to each other.


WispDDE is optional and is only used for Doppler correction and rotator control.


Wisp software setup:

·                    Setup->Satellite Setup

·                    Edit UO-22, or New if not already setup

·                    UO-22 Properties->General (set Name, Type, State, Broadcast & BBS callsigns)


·                    UO-22 Properties->Scheduling (set priority 1)


·                    Frequencies (note at the time of writing the u/l freq is 145.975)


·                    TNC Settings (Set port, speed & TNC type)


·                    Directories (default settings)


·                    MSPE Settings (default settings)


·                    SatGate (default settings)


MixW software setup:

·                    Version: 2.06

·                    Mode->Packet (checked)

·                    Mode->Mode Settings->General (set callsign)


·                    Mode->Mode Settings->Parameters (TxTail 100ms, Enable Full duplex)


·                    Mode->Mode Settings->Beacon/Monitor (set callsign)


·                    Mode->Mode Settings->TNC, Custom AFSK (Enable KISS TNC on TNC emulation port)


·                    Configure->Soundcard Settings (Select soundcard, set sample rate 22025, Full duplex checked, disabled unchecked)


·                    Configure->TNC Emulation (COM1, 19200, Echo unchecked, Disable unchecked, RTS always on, DTR always on, Hardware flow control unchecked)


·                    Configure->TRCVR PTT/CAT…


·                    Press Details button to set the PTT port



·                    Wisp seems to have problems with COM ports above COM9, but MixW is OK with COM ports above COM9

·                    WispDDE versions 4.07 and above are OK up to COM20. Prior to this COM9 was the upper limit.

·                    If you have a 9600bps hardware TNC, use it to check the MixW software is decoding & encoding OK first (eg, TH-D7)

·                    Get your TX & RX sound levels right!

·                    I haven’t managed to get the MixW COM port emulator to work with Wisp.

·                    Wisp: if you enter the frequencies on the first time into setting up the satellite, it will not take. After setting up the other stuff, edit the satellite and then enter them.


Mail Howard, G6LVB