What do you do if the Avee does not work like expected? Most headsets and even Avees have their secrets, and here we tell you how to deal with them.
Most issues can be solved by yourself by using some common sense and adding a pinch of patience.
In this article, we will discuss general issues first and then go into the specialties or secrets for each and every headset we support.

And: this article can be interesting to read even if you do not experience any issues with your headset and Avee Aviation microphone!

General

An aviation microphone system contains two independent parts: the microphone system and the speaker system.
In the Avee aviation microphone, circuitry/electronics for these two parts are contained in the Avee microphone plastic housing.

• The flexible microphone boom with the microphone element is attached to the Avee plastic housing via a micro USB connector.
• The headset (speakers) is connected to the Avee plastic housing via a 2.5mm or 3.5mm audio connector.
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The Avee plastic housing is designed to fit each specific headset and is held securely in place to the headset with a combination of the Avee magnet stripe and the headset audio connector.

The headset with the Avee aviation microphone housing is then connected to the aircraft:

• via a USB C connector on the Avee side and
• a dual-GA, XLR-5, Lemo, Neutricon or U174/U connector(s) on the aircraft side.

• The microphone

For the microphone to work – it needs power.
This power is referred to as the bias voltage (help voltage) and is always fed to the headset from the aircraft.
If the bias voltage for some reason is not reaching the Avee aviation microphone and the headset, the Avee microphone will simply not work:

• When the Avee gets bias voltage, you will have a red led on the bottom side of the Avee housing.
• The led light should be stable red, and it should not be pulsating.
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Troubleshooting – no red light
Reasons for not getting a bias voltage and stable led red light on the Avee can be the following – and we start with the obvious ones:

1. The Avee is not plugged into the aircraft with the Avee Aircraft Interface Cable.
   Fact: on a system using dual-GA connectors, the thin connector is the microphone connector while the thicker connector is the speaker connector.
2. The aircraft avionics is not switched on.
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3. The Avee Aircraft Interface cable is not properly plugged into the Avee microphone.
   The USB C connector with the angeled strength relief on the Avee Aircraft Interface cable needs force to be plugged into the Avee.
   A clear and distinct click should be heard when you plug in the USB C connector.
   When unplugging the USB C connector, you will also need to use force.
   If no force is needed to unplug, the connector has not been plugged properly in – or the connector is damaged.
4. The Avee aircraft interface cable is broken.
   Crosscheck with a functional cable or contact Avee!
5. The Avee Aviation Microphone is broken.
   Crosscheck with a functional Avee or contact Avee!
6. The aircraft headphone connector(s) are not working properly.
   Crosscheck pilot/co-pilot to verify.
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Troubleshooting – red light but no sound in your headset
The red light on the bottom side of the Avee tells us that the Avee Aviation Microphone gets the bias voltage from the aircraft.
If the copilot can not hear you and you can not hear yourself, we need to verify that sound goes out from the Avee microphone:

• We start by turning the intercom squelch off (if available).
  The radio typically does not have a squelch.
• Make sure the microphone is very close to your mouth, and that the white spot on the mic is facing your lips.
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• Make sure the microphone output level on the back side of the Avee is set between a value 3 and 5.
• Verify that the Avee microphone boom is connected securely to the Avee plastic enclosure.
  The ‘rubber’ part of the microphone should fit the Avee plastic enclosure perfectly, and there should be no gap between the rubber part of the microphone and the Avee plastic enclosure.
  If there is a gap, tuck in the lips of the rubber part to make the gap disappear. There is a micro USB connection between the microphone boom and the Avee enclosure / main circuit board, and this has to be a perfect fit.
• Now confirm that the copilot hears herself and hears you.
  If you still can not hear yourself, jump down to the next chapter; otherwise: contact Avee support.
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The co-pilot can hear you, but you can not hear yourself
The most typical reason for this to happen is simply that the audio is turned up on the headset.
The headsets we support behave differently when it comes to adjusting the volume and resetting the volume level. Each headset we support is therefore covered individually, but before we do that we will mention one common error: Double Magnets.

Double magnets
One magnet stripe- one magnet stripe only – should be mounted on the headset. There should not be a loose magnet stripe on the Avee Aviation Microphone.
Using two magnet stripes prevents the audio connector from going into the headset, and hence; no audio in the headset.

Setting the volume – the Bose® QC35, Sony® WH1000XM3,XM4 and XM5
The volume on the QC35 and XM3-5 is set from the Avee Aviation microphone.
Turn the volume knob on the Avee fully clockwise for maks sound.
You get almost normal sound raised to maximum volume in the headset even when the battery in these headsets is dead or ANR is off.

QC35 internal failure
We have seen a handful of QC35 that have an internal audio connector failure.
In this case the QC35 reports it is trying to connect via Bluetooth to the product it was last connected to even when the Avee is plugged in.
In case you experience this problem, verify that the problem is present even when using the QC35 with a non-Avee product: the cable with a 3.5mm audio connector the headset was supplied with originally.  When plugging in this cable, the headset is not detecting this and will try to connect via Bluetooth instead. Wiggle the connector to provoke this behavior.

The only solution to get rid of this exact problem is to repair/replace the headset.

Setting the volume – Bose® QC45
The volume on the QC45 is set with the +/- keys on the right earcup even when the Avee is plugged in.
The QC45 has a feature (read bug) that turns the volume on the headset down to a minimum if you unplug the Avee when the headset ANR is switched on.
You have to manually adjust the headset volume to get the audio back.
The only way to prevent this feature from occurring (as far as we know), is to switch the the QC45 off before you remove the Avee from the headset.
You get close to normal sound raised to maximum volume in the headset even when the QC45 battery is dead, or ANR is off.

Setting the volume – Bose® 700
The volume on the Bose® 700 is set with a swiping vertical motion (see headset manual) for increasing and decreasing volume levels.
Swiping up increases volume, while swiping down decreases volume.
You get close to the headset’s normal /max volume sound when the B700 battery is dead, or ANR is off.
Luckily: the Bose® 700 lacks the QC45 feature turning down the volume to a minimum when powered off with Avee plugged in.

Sony® XM4 and XM5: Muted speakers when you talk
This feature from Sony® is called Speak to Chat and simply mutes your headset speakers when you start talking.
It is a really annoying function until we understand what is happening.

You an turn on and off the Speak to chat function by:

• pressing and holding two fingers on the right earcup:
• the XM4 and XM5 will respond with the spoken message Speak to chat activated or Speak to chat deactivated.
• We want the Speak to chat to be deactivated.
• it seems there is no way you can permanently switch off the Speak to chat function. If someone finds it, please give us a shout!
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Thanks Adrien!

Sound in one ear only
Sound in the left ear only is most likely caused by the fact that the Avee aviation microphone is set to stereo, while the aircraft is mono only.
Set the Avee to MONO to fix.
Please note the majority of commercial and GA aircrafts are mono aircrafts only. The mono audio signal can be wired to both the left & right channels, however – giving an impression that the aircraft is fully stereo.

Please note that when you are using the BlueLink, the Avee will adjust automatically so you get stereo Bluetooth music independant of the setting of the mono/stereo switch on the Avee housing.

Audio right ear only or sporadic left or right ear only
Most likely a cable error or an error on the Avee microphone – or even headset.
Test the headset with the non-Avee supplied cable that came with the headset. Wiggle connector to provoke the problem. if the same issue occur the problem is inside the headset.
Else: contact us on Support.

You can hear yourself – but the co-pilot can not hear you.
This is most likely caused by an internal aircraft setting error on GA aircrafts.
Check isolate switch on intercom.

You can not hear & see the co-pilot
This is a typical situation on single pilot aircraft. Nothing to worry about.

Extremely noisy output from the Avee
This can be caused by:

• The microphone outlevel is set too high.
  Set to 3 to fix
• bad Avee Aircraft interface cable
  Typially the Avee led will flicker if this problem occur.
  Contact Avee support.
• a defective Avee
  Microphone amplifier stage defective.
  Contact Avee support.
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Headset echo / latency
The echo problem – or rather: the latency or delay issue has been reported on the Bose®QC45 and Bose® 700 only.
The reports state that there seems to be a slight delay between the audio in the left- and right earcup under certain conditions.
We have not found a real fix for these issues, but here are some facts:

• the latency issues are created by the headset itself under certain ‘jet’ conditions.
• We do not have any reports of the latency issues on piston aircrafts.
  Please comment if you are a customer with a piston engine / these issues.
• The problem is only experienced when you are talking and get your own voice back in the headset.
• You do not get the latency issue when listening to radio or co-pilot intercom.
• The problem is experienced when the ANR is ON only.
• To some degree, we can provoke the latency in our lab under special conditions, but really hard to find the root cause of this.
• Far from all customers experience the latency issue.
• The problem is not caused by the Avee aviation microphone.
  If it was we could have done something with it.
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Final words
If you still experience problems: we are here for you.
Give us a call – or send us an email saying you have read this article but still do not see the light!

Happy landings !

The Avee Team

The correct procedure to set the headphone volume is according to the following:

• Switch on the aircraft avionics and then adjust the radio volume and the intercom to a low level (4 of 10).

• Connect the Avee microphone & headset to the aircraft and set the speaker volume level on the Avee to maximum.

  Some of the headsets we support have a built in volume level support, while others use a volume wheel found on the Avee plastic housing.
• Switch the headset ANR feature ON.
  For many headsets you will now get some startsup messages.
• Adjust the microphone boom with the flat side / white dot facing your lips with maximum 5-10mm distance.


• Adjust the squelch on the intercom to minimum level (always open) – you should now hear a hissing sound in the headphones.
• Talk into the microphone, you should hear yourself.

  Adjust the intercom audio to on the intercom to a comfortable level.
• Now adjust the intercom squelch so the hissing sound disappears.
Please note that this procedure might be repeated depending on the noise level in the aircraft cockpit when in flight.
  Avoid having air-condition air flow nozzles point directly on the microphone. This will cause unneeded noise.
• Verify that the co-pilot hears you – and that you hear the co-pilot.

  Golden rule if problems: the pilot who can not hear herself talking has the problem.
• Turn off the radio squelch – or tune in a frequency with continous transmission (like ATIS). A hissing radio sound will be heard if the radio squelch is  turned off.

• Adjust the radio output audio to a comfortable level. 
Turn on the radio squelch. The hissing sound should be gone.

• In flight adjustments should always be done from the aircraft audio panels.

Back seat passengers

Let the back seat passengers adjust the volume on their (Avee) headsets if they feel the audio is to loud.

Remember that they can usually not set the output levels between the the radio & intercom individually.

In most aircrafts the audio output level can be adjusted individually for the pilot and the copilot.
On smaller aircrafts the audio level in the back seats is often set to the same level as the co-pilot.

MICROPHONE OUTPUT LEVEL
The microphone output level is sensitive when it comes to the position of the microphone and distance from your mouth.

On the Avee we are using a noise cancelling microphone to get as little cockpit noise as possible in both the intercom and on the radio. The nature of this is that it picks up sound from the near proximity ONLY.
It will not pick up sound from distances more than 10mm.

MICROPHONE CHECKLIST
Here we have some important things to remember:

1. The white spot on the microphone and the flat side of the microphone MUST face your mouth.
   When wearing the microphone you will not be able to see the white spot, but you can feel that the flat surface is facing your mouth.
2. The distance between your mouth and the microphone is critical.
   The optimal distance between the microphone and your lips – is that your lips should touch the microphone foam / wind protection.
   For all practical purposes we say maximum 5-10mm between the microphone and your lips.
3. The output level from the microphone should normally be set to a level between 2 and 5. Level 3 is perfect.
   Adjusting the volume level from the microphone itself will not help much if the microphone is not picking up your voice, so please make sure to follow steps 1 to 2 above.