Connecting radios all over the world

Mimer SoftRadio - Frequently Asked Questions

The Q&A´s are divided in three blocks:

Common Questions on Mimer SoftRadio



Can any radio be connected to Mimer SoftRadio?

Yes, any radio can be connected through microphone, speaker and PTT.  A number of radios can also be connected showing a virtual control head.

See this page for information on which radios.

Is it possible to connect a base station?

Base stations can be connected either through microphone, speaker and PTT or through 2-wire or 4-wire lines 600 ohms, -10dB.

Can more than one user operate the same radio?

Yes all operators can listen at the same time. The first that hits PTT gets control of the transmitter. Since they all share the same radio a channel change from one operator will affect all.

How many users can connect to the same radio?

Locally, in the same sub network, 99 users can connect simultaneously. At the same time one user can connect over the Internet using TCP. If more users are needed over the Internet, you need a Mimer RadioServer or Mimer NetworkRepeater.

How many radios can I connect to one computer?

You can have up to eight devices connected to each computer. A device is a Radio, a Intercom, a Phone or a VoiceLog panel.
A larger version for up to 30 devices is available, called Mimer SoftRadio XL.

Can I listen to all radios on my screen at the same time?

Yes all are monitored in parallel. You can listen to all eight (30 in XL version) radios at the same time. As well as Phone and Intercom.

If I transmit on one radio, can I still monitor the other radios?

Yes you will not loose the audio from the other radios. (Useful when watching for example Marin Channel 16 at an harbour or on board ship)

If I use Mimer SoftRadio for a phone call and I in the middle of the conversation needs to transmit on the radio, what happens.

As in the example above, you will still monitor the radios though you are in a phone call. When you press PTT on a radio your microphone will be switched over to the radio and temporally leave the phone call. When you release the PTT your microphone is back in the phone call. During your radio PTT you will still monitor the phone call.

Can one dispatcher listen to the other dispatchers transmission?

Yes each dispatcher can be set up either for listening to the other dispatchers or for not listening. Read more in the guide “Monitor Tx Audio” found on the Technical download page.

Can we set up an old dispatcher console with audio and RS232 over the Internet?

Yes you can do this via Mimer SoftLine. It will establish a virtual 4-wireline and an RS232 plus some digital I/O:s.

(Also see this page)

Can we use the radios own control head in parallel with the SoftRadio virtual control head?

Yes with some radios, like the Sepura Tetra, Icom M423 or the Motorola MotoTrbo.

But on many radios you need to take away the radios control head and use the remote control head connector for the Network Interface.

Can we use the standard control heads on long distances instead of Windows programs and PC´s?

Yes, we have made adaptions for a number of radios. These include the Sepura Tetra, Motorola analogue and Tetra and also the Icom IC-M423 marine radio.

Read more here.

Technical Questions on Mimer SoftRadio

Why can’t I connect more than one computer over the Internet?

Over the Internet TCP is used and the messages can’t be broadcasted in the same way they are in local networks. Locally UDP Broadcast is used.

Through the use of a Mimer RadioServer or a Mimer NetworkRepeater more than one computer can be connected.

With UDP all status and audio messages are broadcasted to all operators in the subnet without the need to log on or log off. You can have many operators to each radio. But UDP can not pass through routers used in WAN or Internet systems.

With TCP you can pass through routers and you need to log on with a password and to set up ports in the routers. The Mimer NetworkInterface can only handle one TCP connection and there for you need a server when there are several operators.

(Also see this page)

There is a strange sound from time to time, sounds a bit sad?

This is the disconnect alarm signal. It is played when an operator PC loses its connection to a device for more than 4 seconds.
If you use the Internet this might happen from time to time since most networks have drop outs.
From version and up there is a setting to disable this alarm sound in the “Settings Menu”.

We run a system with MotoTrbo DM3600, how can we upgrade to DM4600?

Installations with the old radio type can be upgraded to run with the new radio by changing the interface firmware (4.148 or later) and running the latest Mimer SoftRadio ( or later). All hardware is the same.

How much latency and jitter can the system handle over the IP link?

The NetworkInterface can handle latency and jitter up to 400ms. You will hear this as a delay but will not loose any information.

With the help of a RadioServer the latency can go all the way up to 4 seconds. After that you will start to loose information.

Will SoftRadio work on Windows 7, Windows 8 and Windows 10, 32 and 64 bit versions?

Yes, no problem.

How much bandwidth does Mimer use in the LAN?

Mimer will load your LAN with about 80kbit when there is audio.

When there is no audio only a “heartbeat” is sent every second so that the application knows that the interface is still there.
Systems with virtual control heads also sends information every time the radio display is updated. The data load for this varies between different radio types.

Technical Issues at set up of a system

I have connected my Network Interface to the radio but it does not work?

A1: Please note that on for example Motorola GM380 the radios control head needs to be taken off, and the remote mount head installed instead. The Network Interface is then connected to the port for the remote mount cable. Motorola kit nmbr RLN4780. (Also see this page)

A2: Please note that on the Motorola MotoTrbo a setting needs to be done in the radio programming in order for Mimer to talk to the radio. On the Accessories page of the CPS there is a choice for Cable Type. This should be set to: “Rear Data Accy”. (Also see this page)

Instead of speaker symbols on the green buttons there are ordinary letters “A, B, C etc?

This happens if SoftRadio cannot find the special font file with the icons for the green buttons.
This might happen if the operator PC has different logins for the user and for the admin and these two are set up in the PC with different languages.

Either set the same language for all users and the admin or go into: “Control Panel/Fonts/Font Settings” and uncheck the box “Hide fonts based on language settings”.

There is no received audio in the PC speakers or the sound is very low?

A1: Check the PC audio settings. Also check that there are no other audio applications in the PC that might take over the audio control. We have experienced problems with an application called “SmartAudio”, that wasn´t very smart.

A2: Check in “Mimer Connections Setup” that the proper audio device is chosen for SoftRadio.

A3: Check that the audio level for each device in SoftRadio is not at a unnormal low level.

I can hear myself in the PC speakers when I am transmitting on a radio?

This is a setting in the audio card. When using a headset it can be good to hear yourself, but not when using speakers. Open the settings of your microphone in Windows and untick the box “listen to this unit”.

I save my settings, but when I restart, the application is back as before?

Windows does not recognise you as a local admin on the PC or the user profile. Each user needs to be set up as “local admin”.

How do I connect an external PTT to the PC?

Closing pins 7 & 8 in the PC:s COM-port will give you PTT on the selected radio. You also need to set which COM-port to use under “Settings” in SoftRadio.

If your PC doesn’t have a COM-port, you can use a USB to COM-port dongle.

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