LeoSounds AvMike-1 User manual

Users Guide
LeoSounds AvMike-1
Pilot microphone and cable set
How it works
As an addition to a commercially available ANR (Active-Noise-Reduction) headphone for the
hi-fi range, the AvMike-1 provides a microphone cable harness with a clamp that turns the
customer-supplied headphone into a wholesome and extremely lightweight ANR pilot
headset. The microphone corresponds in its performance, electr. 100% of the GA range
Carbon standard and is equipped with noise canceling properties. As usual, the microphone
capsule is supplied via the phantom voltage present at the cockpit microphone input. The
microphone is attached to a very stable but flexible high quality goose neck. The stiffness of
the goose neck is designed in such a way that even in severe turbulence the micro remains in
its adjusted position. The entire microphone unit can be mounted on the headphone without
the need for tools and without the need for a change of the headphone via the clamping device
and the clamping screw - can be removed at any time. Thus, the headphone can also be used
without any restrictions for regular audio use without being altered or damaged..

Design and scope of delivery
1 Clamping device
2 Clamping screw
3 Microphone with pop protection
4 Flexible goose neck
5 Connector headphones
6 Supply cable with splitting and volume control
7 PJ connector headphone cockpit
8 PJ connector microphone cockpit

Installation and operation
AvMike-1 is mounted on the left side of the headphone – for this purpose, the clamping
device must be opened beforehand. Make sure that the clamping device is at the lowest
position on the headband (see pictures). The knurled screw of the clamping device should be
tightened in this position, the firm seat of the microphone device must be checked and
corrected if necessary.

After the mechanical assembly has been completed, the plug (5) must be plugged into the
headphone. A noticeable, complete insertion ensures the proper connection to the headphones
- if the plug is not fully inserted, there may be interference / malfuntion in the headphone. The
complete insertion must be checked before each flight - if the plug has loosened it can lead to
malfunctions on the right and / or the left earcup. Finally attach the cables with the Velcro
tape. The velcro should be carried only one layer between the fork and the auricle so that the
auricle can move freely.
Adjustments :
The squelch level : should be checked in the aircraft and shall be adjusted if necessary .The
micro positioned rather at the angle of the mouth than directly before it. The micro itself has,
like most carbon standard / noise canceling microphones, has a active "TALK" side facing to
the mouth – correct positioning : the white label on the micro indicates the talk-side - and is
directly facing your mouth - or mouth-corner ideally.
Mic output readjustment : pull back the mics windscreen - and you will see a recessed small
slotted screw. Use a small watchmakers slot-screwdriver: a full 360 deg turn clockwise (
counterclockwise ) will increase (decrease ) the mic-outpout by about 60mV - the trimmer has
a mechanical range of about 12 * full 360 deg turns or electr. appr. 100-800mV linear
adjustment. How to adjust : dial clockwise or counterclockwise ( as needed ) 180 deg and
test, dial another 180 deg and test ... and so on. Preadjustment is about 400mV - which is Ok
for most cases.

Important notes for operation:
1.) EASA ETSO / FAA TSO Approvals AvMike-1:
although it would be techn. Possible - currently there are no ETSO or TSO approvals -
possibly these will be carried out in the future. In areas (commercial aviation: regulated
individually in the companies, IFR operation not clearly regulated (know-how status of the
author)) in which these approvals are required : AvMike-1 can not be used - although techn.
no problem. There is no need for approvals in VFR general aviation flying in general.
According to which the headsets have to be certified - for the operation in the European area
the CE-conformity as a crew equipment object is decisive - AvMike-1 is CE certified.
2.) Operation of AvMike-1
in conjunction with ANR headphones: we strictly point out that the operation of active
headphones in exceptional cases can lead to surprising problems. If an ANR headphones with
a weak battery / rechargeable battery is out of operation, it must be ensured that the operation
of the headphone can be carried out without ANR and missing battery power in the least
restricted form (this is the case with the BOSE QC-25 and 35 ). The headphone output can
sometimes be greatly reduced in case of a failed battery. - If necessary, adjust the volume at
the Intercom. We do not recommend using AvMike-1 with headphones, which have a 100%
loss of functionality (currently BOSE QC15 – not supported by AvMike1) in case of a battery
failure, so that no reception / understanding via this headset is possible – blind messages can
be sent via the microphone that will always work independent from the phones. With careful
preliminary planning, testing and backup headset, these headphones can also be used - but we
do not recommend this.
3.) Before each start and departure:
- Check for sufficient battery power on the headphones
(depending on type - mostly LED indication)
- Check whether remaining battery-life is suitable for your trip
- Check the fixed mechanical seat of the microphone set on the headphone
- Check if the cable is fully inserted into the ANR headphones
- Check / setup correct position of the micro and observe the micro "TALK" side
- Check the basic headset functions at the cockpit intercom
(Voice test, squelch to be adjusted if necessary)
Technical specifications
Total weight: ca. 200 grams
Microphone: GA carbon standard capsule, active amplified, noise canceling
Audio: Mono - suitable for 150 Ohm GA standard
Volume control: 3dB maximum attenuation
Connections cockpit side: PJ standard or XLR5 or Bose-Lemo
Clamping device suitable for BOSE QC25 and QC35

Manufacture and distribution
LeoSounds
Michael Pantleon
Braunäckerstr. 11
74343 Sachsenheim
Germany
[email protected]
More information :
The name BOSE, QC15, QC25,QC35 and the corresponding photos in this manual are given here only
to clari y the characteristics and assembly o the LeoSound AvMike-1 - with BOSE does not connect
us any business or other relationship, we are not a dealer o BOSE headphones.
- CE Declaration o Con ormity or AvMike-1 is available
- Model protection applied Gebrauchsmuster Patentamt Munich Germany
- WEEE RegNr. For AvMike-1 94899094