Evo Intercom Issues:

Vox adjustment / Activation

If you are finding the Vox adjustment knob is not working, unplug everything from the Evo, leaving only the Rider headset and the power lead connected.  Set the Vox adjustment to 0 = Fully anti-clockwise.  Unplug the power for 5 seconds then re-apply power.  Wait 10 seconds for the Evo to “power up” then listen to your headset.  If you can now hear your voice through the system correctly, slowly adjust the vox until it cuts your voice off  and is working correctly.

If it still does not work, please go to our “Returns” section.

Rider to Pillion / Headset Communications

If you cannot hear your voice through the system, first turn the Vox adjustment knob to 0 (fully anti-clockwise), remove the power for 5 seconds and the re-apply power.  Wait 10 seconds to power-up, then try again.

You could try swapping over the headset, headset “Pro” lead and even the Evo headset lead (with the “Pro” socket), just in case the problem lies with those parts and not the Evo.

If, after conducting the above tests, you still cannot hear anything through the headsets, check that you have 12v coming through the power lead (you should hear the Evo making clicking and hissing noises during power-up)

If it still does not work, please go to our “Returns” section.

Music Input

If your music device which is connected to the music input of the Evo is not coming through correctly, set the vox adjuster to about ¼ turn, disconnect the power for 5 seconds and wait 10 seconds for “power-up”

If the music is not muting when you talk, the input volume from your music player may be simply too high.  Try turning down the volume of the music source.

If the music is muting intermittently:

This can be caused by either the Evo’s internal squelch ( so simply turning up the volume output on your player will fix this), or the music is being muted by the VOX adjustment being too low (mute being triggered too easily).  

The Evo is designed to mute the music if it detects any noise signal coming in on any of the leads, so in order to find the cause of the problem, unplug all cables except the power, headset and music lead, then check it again.  The cause will certainly be either a bad connection in the power lead, a headset lead connection, or even excessive interference coming in via another input lead.  By a process of elimination, you should be able to find the cause.

If it still does not work, please go to our “Returns” section.

GPS - Wired Connection

If you cannot hear the instructions through your Evo, and the Evo is working correctly in all other ways, try plugging the GPS lead into the Music socket of the Evo.  If there is still no sound, you have either a broken lead or a faulty GPS

If the GPS audio instructions are distorted and not clear, try adjusting the output volume of the GPS.  If the audio is still not clear, you may need to order an Isolated lead from us.

GPS - Bluetooth, including ZUMO

Please click HERE for connection details

Phone - Wired connection

Do Not try to plug the supplied 2.5mm stereo lead into the 2.5mm 4 pole connection on your phone,especially Nokia phones.  In order to have it work correctly, you will need to obtain a (Base Adapter) for your phone.

Set your phone to “Auto Answer” in it’s hands free menu so that it operates correctly with the Evo.

We have never so far had a report of a wired phone connection problem that was not realted to either the Base adapter or the phone menu settings.

Phone - Bluetooth connection

Certain phones do not support “Auto-Answer” when utilising a Bluetooth connection, so it is not possible to answer incoming calls when riding.  Check your phone manual to see if it is or is not available on your particular model.  We are working on a solution.

Intermittent / Erratic performance

The most common cause of erratic performance is the power supply.  Check all the connections for the 12v supply, paying special attention to the fuse holder and fuse.  If you find any signs of corrosion, you should upgrade your power supply lead with our new Blade-Fuse power lead, these are more resilient to vibration and corrosion than our earlier Tube Fuse versions.

Unplug the power for a few seconds to re-boot the Evo, this often fixes most problems.

If this is not the cause, unplug everything from the Evo except the headset lead and power lead.  Using a process of elimination you should be able to identify what lead or device is causing the problem for the Evo.

If it still does not work, please go to our “Returns” section.


The Evo in itself does not and can not create interference.  Interference noise can come into the Evo by 2 paths

1) Via a wire or lead, with the noise being introduced directly into the cable, or by induction when a cable lies in close proximity to other wires in the vehicle wiring that are carrying noise themselves.

2) Through the air, in the form of RF (Radio Frequency).  Most usually caused by unsuppressed alternator, coils, spark leads, other ignition components or even bike to bike radios.

Finding the source of interference is usually very easy.  

1) Unplug everything from the Evo except the headset.  Make sure the headset lead does not lie near to any vehicle wiring.

2) Get a 9v PP3 battery (as used in smoke alarms) and connect this to the power lead.  If the noise is still there, the interference is coming through the air (RF) and you need to get your vehicle examined by a specialist.

3) If the Evo is now OK, start plugging in the various device leads one at a time until the interference returns, then you will know what the problem is.

Be very wary on BMW motorcycles of the bunch of cables that run from the engine management system under the seat, through to under the tank, these cables have been known to create massive interference, so you must run all cables-including the power cables- on the other side of the frame.

Bike to Bike Radio

If possible, make sure that your radio is transmitting and receiving properly to other radios as a walkie-talkie - not connected to your Evo.

Transmission / Reception breaking up (NOT interference).  This is nearly always caused by a bad connection

1) To eliminate power issues, power the radio by battery only.

2) If you are using a remote antenna, unplug it and fit the original antenna.

Try the system.  If you are still getting breakup, try wiggling the leads, cables and connectors whilst either transmitting or receiving to another radio and listen for any unusual noises or breakups.  

3) Try with the engine on and off - just to be sure.  

4) When the system seems OK, try re-connecting the remote antenna and bike power adapter, one at a time.

5) Finally, have your friend with the walkie talkie listen to you making a constant transmission whilst you ride around a car-park etc, listen for breakup when you go over bumps, this indicates a bad connection.

6) Check your PTT button, wiggle your thumb whilst transmitting - does the sound breakup ?

By now you should have identified the cause of the breakups.


This can be created by a vast number of causes.  The best way to test this is to have a friend with another radio as a walkie talkie only, standing some distance away and listening to your transmissions / receptions.

1) Run the radio on a battery only & fit the original antenna. - Test

2) With engine running and without. - Test

3) Remove all toolkits (bags of spanners etc) from the area around the radio.

4) Once you have achieved good transmissions, by a process of elimination you should be able to identify the cause of the interference.

No Transmission / Reception

1) Have a friend with a walkie talkie check that the radios work “Off” the bike.  Check for Transmission and Reception audibility - don’t just rely on screen indicators and LED’s

2) Check that the Transmit indicator on the radio is activated when you press the PTT.

3) Check that the Receive indicator is activated when your friend transmits back to you.

4) If the Tx (transmit) indicator is on, but no sound is received by your friend, the problem may lie with the Evo or your headset.  Same goes for the Rx (receive) indicator.

Swapping this test between the bikes will usually identify the cause of the problem