Flightcom Denali Aviation User Manual page 2

Microphone and Boom Adjustments
• Adjust the mic boom for proper fit and comfort. Place the micro-
phone no more than 1/8" from lips, at the corner of the mouth.
This is critical to the performance of the noise-canceling electret
microphone.
IMPORTANT: All Denali mic booms are shipped from the factory for
wearing on the left side of the head only. Because the domes are
0-1/8" from lips
canted to match the angle of the ears, the boom can ONLY be worn
on the left side.
CAUTION: Rotating the boom beyond the "stop" will cause non-warranty damage to the boom.
INSTALLATION
• Insert the larger headset plug into the jack marked "headphone" or "phone" (on your
aircraft com panel, intercom or radio).
• Insert the smaller headset plug into the jack marked "microphone" or "mic."
• Set the stereo/mono switch on the cable splitter box to the "M" position. If connecting
to a stereo intercom, set the switch to the "S" position.
• If you are not sure about the type of intercom in the aircraft, test the headset by select-
ing the "S" position and talking into the headset. If you hear sidetone out of one ear
only, you have a mono intercom. Move the switch to "M."
• For the ANR model: The stereo/mono switch is located on the
back of the in-line battery box, near the clip.
• Adjust the headband sliders for proper fit and comfort, making
sure the boom is being worn on the left side of the head.
• Individual volume controls are located on the front of each ear
stereo/mono switch
dome to reduce or adjust the level of audio in each headset ear cup.
• For the ANR model: Once the 9-volt battery is installed, turn the ANR power to the
ON position, indicated with the symbol "|." The OFF position is indicated with an "o."
A blinking green LED indicates the active noise cancellation circuit is ON. A blinking
red LED indicates low battery life. (For proper battery installation, see the diagram in
the Care and Maintenance section of this guide.)
If the aircraft does not have a built-in push-to-talk (PTT) switch, a portable PTT switch
must be installed in order to use the radio.
An avionics technician should optimize the master gain control located in the aircraft
radio whenever adding a new model microphone to the system.
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Sure Power System (SPS): To conserve battery life, ANR models will automatically shut off
the ANR circuit if no audio is sensed by the headset for a period of 28 minutes. Full passive
performance is maintained. ANR operation is reactivated by turning the ANR power switch to
the OFF position and back to the ON position, indicated with the symbol "|."
Care and Maintenance
GENERAL CARE
As with most electronic equipment, it's important to protect your Denali headset from exposure
to the elements. Do not leave the headset on the seat of the plane, car, or in intense, direct
sunlight exceeding 156° F. Do not leave the headset out in the rain or in freezing temperatures.
Return the headset to its carrying case and store in a cool, dry area.
IMPORTANT: Contrary to popular belief, wrapping the headset cords around the headband is
not a proper storage method. In fact, by doing so you risk damaging the com cable, splitter,
or battery box. Instead, loosely loop the headset cord in your hand and place the cable in
the headset bag, next to the headset.
GENERAL CLEANING
To clean the Denali headset, earseals, or headpad, dampen a non-abrasive cloth with water and
mild soap. After cleaning, wipe dry with a soft cloth. Note: do not allow any water to seep into
the ear dome.
IMPORTANT: Do not immerse the headset in water. Never use bleach on ear seals, headpad, or
any other part of the Denali headset.
Denali Ear Seal Removal and Installation
REMOVAL
Your new Denali ear seals are permanently attached to
ear cup
the hard plastic backing plate. Do not attempt to remove
the ear seal from the backing plate.
To remove the ear seal assembly, look inside the ear seal
opening, half way down either side of the ear cup. You
will notice a small cut-out just large enough to place your
finger tip under the backing plate. Pull the backing plate
(with the ear seal) away from the ear cup. Note: it will
take a bit of force and the ear seal will pop off of the
ear cup.
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INSTALLATION
Lay the gasket (for ANR models only) flat on the ear seals backing plate. The gasket must
have no wrinkles. Carefully position the backing plate (with the gasket) on the ear cup and
apply even pressure with your fingers spaced around the circumference of the ear seal/back-
ing plate and then snap on to the ear cup. Note: the backing plate must not have any space
between it and the ear cup.
Denali Headpad Removal and Installation
Your new Denali headpad is permanently attached to the backing plate. Do not remove the
headpad from the backing plate.
To remove the headpad, pull on each side of the headpad and it will snap out of position
on the headset. To install the headpad, line it up to the top of the headset and then snap
into position.
Replacing the Battery
To install or replace the ANR battery, open the battery door by sliding the door in a downward
motion until it unlatches and lift up as shown in diagram A.
Slide the 9-volt battery in with the larger battery contact on the bottom. If you put the
battery in upside down, it will not activate. See diagram B.
Battery life is dependent on the ambient noise in the aircraft, but should provide a
minimum of 20 hours of continuous use.
CAUTION: Bias voltage supplied to the microphone must come from voltage and resistance
ranges specified below. Voltages supplied in excess of those stated in the specifications
can cause microphone failure and void the warranty. The mic audio signal is present between
the ring and barrel of the mic plug; tip is reserved for transmit keyline.
ear seal
B
Cut-out
backing plate
larger contact
on bottom
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Specifications
Shielding
Weight
Temperature Sensitivity
Battery Life
Origin
Sensitivity(@1mW in dBspl)
Frequency Response
Impedance
Total Harmonic Distortion (@1kHz)
Maximum Power Input
Noise Reduction Rating
Type
DC Bias Voltage
Supply Source Resistance
Frequency Response (± 6dB)
Sensitivity (@ 114dBspl*)
Noise Rejection Ratio (@1kHz)
Total Harmonic Distortion (@ 1kHz)
Impedance
Maximum Speech Level
Maximum Ambient Noise Level
*Sensitivity measurements referred to 0.0002 ubar (dynes/cm 2 ) @ 1kHz. Microphone measurements made
with 10-volt supply with a 1000 ohm resistor.
Contact Flightcom for the most current ANR specifications.
Plug Connection Chart
headphone ground right on stereo (300Ω)
.25"phone plug and shield ground on mono
headphone microphone
.206" phone plug ground microphone hot
A
D e n a l i
Denali Passive Denali ANR
Full floating Full floating
w/independent ground w/independent ground
11.0 ounces 12.9 ounces
Not to exceed 156° F Not to exceed 156° F
Not applicable 20 hours of continuous use
Made in USA Made in USA
104dB
90Hz—20kHz
300 ohms stereo/ch.—150 ohms mono
<.15%
250 mW
21dB
Noise canceling electret condenser
w/constant-gain preamp
8-16 volts
220-2200 ohms
420Hz-6.4kHz
1.3V
-46dB
<0.3%
500 ohms
112 dBspl*
132 dBspl*
program audio ground (headphone)
left on stereo (300Ω)
program on mono (150Ω)
microphone microphone hot
ground and shield
no connection
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