Additional Information

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Networking over internet

When, for instance, activating a special event callsign it is possible to network multiple stations over the internet.

Please be aware that a geographically distributed station is, with only a few exceptions, against the rules in contests


The most secure way to do this is to rely on a VLAN (virtual LAN) software. There are several available such as:

LogMeIn Hamachi

Each VLAN solutions have their own particular set up which is covered in their respective documentations.
With a VLAN solution, all configurations are the same as when operating in a regular LAN.

Port forwarding

If you are less worried about competitors or government agencies listening in on your contest data,
it is possible to route the traffic directly over the internet using port forwarding at the server.

Important security notice: This solution is not without risk. It offers no security or authentication.
Any station running the same contest configuration, knowing the URL or IP address and IP port of the
server can connect to the server station. There are no means to disconnect a station by force.

With a port forwarding solution, the following must be observed:

  • Only one of the stations should be configured as the server.
  • "Connect as client" should not be checked and "UDP network broadcast" should only be enabled if it is
used to communicate with another client on the same LAN.
  • The PC acting as server must have a fixed LAN IP address. This is done either by manually configuring the
PC to use a fixed LAN IP address, or by setting up the router in the server's LAN to to always allocate
the same IP address to it.
  • The internet connection used by the server PC must either have a fixed public IP
address or use dynamic DNS. Otherwise clients will not be able to reliable connect over the internet.
  • The server's IP port (default 9888) must be forwarded to the internet by configuring the router
connecting the server to internet. Only TCP traffic should be forwarded. UDP traffic
is broadcast and should only be used locally.

Example configuration for server for networking over internet

Example of port forwarding UI in router

  • All other PC in the multi-station set up should be set up as clients.
  • Over the internet, "Server IP" is either the public IP address of the server's internet
connection (e.g. or the dynamic DNS address (e.g. Clients connecting
over the internet does not have to enable UDP networking and should not enable a server.
  • A client may connect via UDP if it is on the same LAN as the server or a "master client".
A "master client" is a client that connects to the server using the "connect as client" option in
the networking set up panel. A "master client" can act as a UDP gateway which means that if
several computers on a LAN are part of the same multi station set up but the server is located
elsewhere, only one computer in that LAN needs to connect as a client and the rest can use UDP.

Example configuration of client for networking over internet

  • In a multi-station setting it is recommended to enable Options->Networking->Don't allow QSO logging if operator isn't logged
  • Make sure Options->Enable network is checked.

COM port keying with Microham

The Microham USB device router is a powerful software. It offers two virtual, CAT-aware, COM ports for one radio.

However, if they are not both set to the speed of the radio or closed, the ports will stop working.

DXLog currently does not allow setting the speed of port used only for keying. And virtual serial port does not have a setting for speed in Windows' device manager.

To make sure a port used for only keying is opened at the right speed do the following:

Open the interface configuration panel.

  • Select the wanted port and check the enable box.
  • Select it as Radio 1 and click Setup.
  • Select a random radio model and set the correct speed.
  • Set the wanted keying (e.g. CW = DTR, PTT = RTS, Foot switch, Active with Radio 1, etc.)
  • Press OK
  • Change from "Radio 1" to "-". Do not click Setup.
  • Press OK

SO2V audio control with Microham MK2R/MK2R+

Since the Microham MK2R/MK2R+ supports selecting/mixing of any input it is possible to create a switching
profile (a.k.a. "Function") for SO2V with's built in audio control.

Example of settings for SO2V audio control

With a profile like this, the audio control shortcuts Ctrl-Alt-A, Ctrl-Alt-T and Ctrl-Alt-S will work and
select either the main receiver in both ears, the sub receiver in both ears or, or one in each ear.

Enabling the built-in MP3 encoder in Windows

For contest recording the PC needs to have a working MP3 encoder installed. Windows does not come with such an encoder enabled.

There are several third party MP3 encoders available, such as LAME

It is also possible to enable the encoder "hidden" inside Windows.
This is described here:

Real time upload to Club Log Live Stream

DXLogStream is a basic Windows utility (which can run minimized) that uses the radio information broadcast over
UDP from and uploads logged QSO to Club Log for display using its Live Stream feature. Typical use cases
are DXPeditions, IOTA activation, Special event stations, etc.

The utility requires a valid Club Log account with the used station call sign registered.

Networking must be enabled with Options->Enable Network. UDP networking must be enabled and the station ID and
used port must be the same as set in Options->Configure network. Settings are saved by hitting ENTER or clicking
the Save button. If the UDP port is changed, the utility needs to be restarted.

The station callsign entered into the text box is the one used for upload. does not convey this as
part of the logging information via UDP which means that the corresponding setting in's contest
configuration is ignored.

The utility can be downloaded here:

Read more about Club Log Live Stream here:


Streamlining ESM