1) Position the 'Talk' side of the microphone (indicated by a solid white dot just outside of the windscreen) to be pointed directly toward your mouth.  The microphone should be close enough that your lips will touch the windscreen when you purse them, but not so close that they touch when you talk.

2) Verify the Microphone Routing Switch ( located on the face of the Aviation Application Cable)  is in the Aircraft position.

3) Verify the Microphone Gain ( the thumbwheel located on the side of the Aviation Application Cable)  is turned up to 8 or 9.

4)  HARMONY Pro Only  (2016-2021) - Verify the switch on the back of the inline controller (the pill shaped housing on the cord about 6” (12cm) from the headphones)  is set to the Phone or O position.

Additional Steps:

1) Gently move the cable in different directions near any junction with a plug or housing.  If the microphone cuts in and out with movement then there is a fault and the component with the fault will need to be replaced.

2) Cycle the switch in step 4 about a dozen times and return it to the 'Phone' or 'O' position.  This should alleviate any potential contact issue in the switch mechanism.

Sidetone is solely a function of the aircraft radio/intercom.  There is no circuitry in the headset that feeds microphone audio back to the headphone speakers.  Any controls for sidetone will be found on the radio or intercom.

If you are also getting reports of weak transmissions, please review the 'Microphone Weak or Inoperative' troubleshooting steps above as weak microphone output can also affect sidetone level.

1) Position the 'Talk' side of the microphone (indicated by a solid white dot just outside of the windscreen) to be pointed directly toward your mouth.  The microphone should be close enough that your lips will touch the windscreen when you purse them, but not so close that they touch when you talk.

2) Adjust the Microphone Gain (the thumbwheel located on the side of the Aviation Application Cable) to find the proper balance point between low cockpit noise and strong transmissions.

This is usually a result of Radio Frequency Interference (RFI).  This issue can be particularly problematic for hand-held radios as they are often high powered and the antenna is in extremely close proximity to the headset.  There a few things that may help alleviate this issue.

1) Move the headset as far away from the antenna as possible.

2) Adjust the angle of the cord in relation to the antenna.

3) Lower the Microphone Gain.

This is usually a result of Radio Frequency Interference (RFI).  This issue can be particularly problematic for hand-held radios as they are often high powered and the antenna is in extremely close proximity to the headset.  There a few things that may help alleviate this issue.

1) Move the headset as far away from the antenna as possible.

2) Adjust the angle of the cord in relation to the antenna.

3) Lower the Microphone Gain.

1) Verify that the Left and Right Volume Controls (located on the Aviation Controller) are both turned up.

2) Verify that the headphones are turned on and have a good battery.

3) Clean the plugs that connect to the headphones and aircraft with rubbing alcohol and a clean cloth.  Be gentle to avoid bending any pins or plugs.

4) Test the headphones separately from the HARMONY to verify that they are functioning properly.

1) Verify that the Left and Right Volume Controls are both turned up.

2) Verify the Mono/Stereo switch is in the proper position.  Mono (one bar) position when used with a Mono Comm Panel or Stereo (two bar) position when used with Stereo Comm Panels.  If you are unsure, it's probably Mono.

3) Clean the plugs that connect to the headphones and aircraft with rubbing alcohol and a clean cloth.  Be gentle to avoid bending any pins or plugs.

4) Test the headphones separately from the HARMONY to verify that they are functioning properly.

The Microphone can only be connected to one destination at a time.  Either it is connected to the Aircraft or to the External Device connected via the Auxiliary Jack.

1) Set the Aircraft/Phone switch (located on top of the Aviation Controller) into the 'Phone' position.

2) Clean the plugs of the Auxiliary Cable by wiping them with a soft cloth.

3) Test the headphones separately from the HARMONY to verify that they are functioning properly.

4) Try a different Auxiliary Cord (our Aux Cords are standard four conductor cables found at most electronics retailers).

Sidetone is a function of the attached device.  Most smart phones and tablets do not provide any sidetone.  If your device does support sidetone, it's output will be controlled in the devices settings.

1) Verify that the Audio is turned up on the External Device while the HARMONY is attached.

2) Verify both the Left and Right Volume control on the Aviation Controller is turned up.

3) Clean the plugs that connect to the headphones and both plugs of the Auxiliary Cable.  Be gentle to avoid bending any pins or plugs.

4) Test the headphones separately from the HARMONY to verify that they are functioning properly.

5) Try a different Auxiliary Cord (our Aux Cords are standard four conductor cables found at most electronics retailers).