Rev
-001
Headphone Audio Notch Filter - U-174
Installation and Operating Manual
Rev B
Jupiter Avionics Corporation
1959 Kirschner Road
Kelowna BC
Canada V1Y 4N7
Tel: +1 778 478 2232
Toll-Free: 1 855 478 2232
www.jupiteravionics.com
B Page i
eqJAC-001 Headphone Audio Notch Filter - U-174
RECORD OF REVISIONS
Revision
Rev Date
Description
ECR
A
Mar 2017
Initial release, Serial number 1001 and higher.
4597
B
Jun 2018
Redesign
5510
Prepared:
Checked:
Approved:
IMPORTANT:
Installation and Operating Manual
C
opyright 2017 Jupiter Avionics Corp.
All rights reserved
Jupiter Avionics Corporation (JAC) permits a single copy of this manual to be printed or downloaded for the express use
of an installing agency. Any such electronic or printed copy of this manual must contain the complete text of this copyright
notice. Any unauthorized commercial distribution of this manual is strictly prohibited. Except as described above, no part
of this manual may be reproduced, copied, transmitted, disseminated, downloaded, or stored in any storage medium for
any purpose without the express prior written consent of JAC.
Information in this document is subject to change without notice.
To confirm the current revision status of this manual, visit the JAC website:
www.jupiteravionics
.com
MP
B
Rev B Page ii
JAC
10-11-18
MB
JAC
10-11-18
KDV
eqJAC-001 Headphone Audio Notch Filter - U-174
Installation and Operating Manual
Table of Contents
SECTION 1 - DESCRIPTION ................................................................................................................................................. 1
1.1 System Overview .................................................................................................................................................... 1
1.2 Features Overview .................................................................................................................................................. 1
1.3 Inputs and Outputs .................................................................................................................................................. 1
1.3.1 Inputs ............................................................................................................................................................... 1
1.3.2 Outputs ............................................................................................................................................................ 1
1.4 Specifications .......................................................................................................................................................... 1
1.4.1 Electrical Sp ec ifications................................................................................................................................... 1
1.4.2 Mechanical Specifications ............................................................................................................................... 2
SECTION 2 – INSTALLATION ............................................................................................................................................... 3
2.1 Introduction .............................................................................................................................................................. 3
2.2 Continued Airwort hi nes s ......................................................................................................................................... 3
2.3 Unpacking and Inspecting Equipment..................................................................................................................... 3
2.3.1 Warranty .............................................................................................................................................................. 3
2.4 Installation Procedures ............................................................................................................................................ 3
2.4.1 Installation Limitations ......................................................................................................................................... 3
2.4.2 Cabling and Wiring .............................................................................................................................................. 3
2.4.3 Mechanical Installation ........................................................................................................................................ 4
2.4.4 Post Installation Checks ...................................................................................................................................... 4
2.5 Installation Kit .......................................................................................................................................................... 4
2.6 Installation Drawings ............................................................................................................................................... 4
SECTION 3 – OPERATION .................................................................................................................................................... 5
3.1 Introduction .............................................................................................................................................................. 5
3.2 Controls and Annunciators ...................................................................................................................................... 5
3.2.1 Power On Annunciator .................................................................................................................................... 5
3.2.2 Notch Center Frequency Control (FREQ) ....................................................................................................... 6
3.3 Operation ................................................................................................................................................................. 6
3.3.1 Microphone Operation ......................................................................................................................................... 6
3.3.2 Phone Operation ............................................................................................................................................. 6
3.4 Batteries .................................................................................................................................................................. 6
3.4.1 Inserting or Replacing the Batteries ................................................................................................................ 6
3.4.2 Battery Cautions and Warnings ...................................................................................................................... 7
Appendix A - Installation Drawings ................................................................................................................................... A1
A1 Introduction ............................................................................................................................................................ A1
A2 Installation Drawings ............................................................................................................................................. A1
Rev B Page iii
eqJAC-001 H ea dph one Audio Notc h Fil ter - U-174
SECTION 1 - DESCRIPTION
Name
Qty
Type
MIC INPUT HI/LO
2
Audio signal
PHONES INPUT HI/LO
2
Audio signal
Name
Qty
Type
MIC OUTPUT HI/LO
2
Audio signal
PHONES OUTPUT HI/LO
2
Audio signal
1.1 System Overview
The eqJAC-001 Headphone Audio Notch filter allows the user to manually select a narrow band of unwanted
frequencies to be removed from the headphone audio.
1.2 Features Overvi e w
The eqJAC-001 unit features an industry standard helicopter headset pin-out to allow plug and play operation.
The eqJAC-001 plugs in-line between the User's headset cord and the aircraft intercom system headset connector.
The eqJAC-001 supports a single control to adjust the center frequency of the notch filter.
The eqJAC-001 supports an automatic on/off power function that senses the intercom microphone bias voltage
allowing the user to unplug the unit from the aircraft to turn power off.
1.3 Inputs and Outputs
Refer to the eqJAC-001 connector map for the mating connector designators and pin assignments for the
input and output signals.
1.3.1 Inputs
1.3.2 Outputs
1.4 Specifications
1.4.1 Electrical Specifications
Power Input
Primary nominal bias voltage 12 Vdc
Maximum bias voltage 16 Vdc
Minimum bias voltage 10 Vdc
Bat
tery nominal voltage ± 3 Vdc
Battery minimum voltage ± 2 Vdc
Battery current
185 mA max
Rev B Page 1
1.4.1.1 Audio Performance
Rated Input Level
PHONE INPUT audio rated input level 6. 7 Vrms ± 10%
Rated Output Power
PHONE OUTPUT rated output level 6. 7 Vrms ± 10% into 150 Ω
Audio Frequency Response
PHONE OUTPUT ≤ 3dB from 240 to 1450 Hz
Distortion Characteristics
PHONE OUTPUT distortion at rated power ≤ 10 % THD + N
PHONE OUTPUT distortion at 10% of rated power ≤ 3 % THD + N
Input Impedance
PHONE INPUT impedance 1000 Ω ± 10%
Audio Noise Level without Signal
below the rated output by ≥ 60 dB
eqJAC-001 Headphone Audio Notch Filter - U-174
Installation and Operating Manual
1.4.1.2 Audio Performance, Other
Phones output circuitry type shall be single ended
1.4.2 Mechanical Specifications
Height
Length (Excluding connectors)
Width
Weight (Including Batteries)
Material
Connectors (2):
Mounting
Bonding
Installation kit part number
1.07 in [27.2 mm] max
4.1 in [104.1 mm] max
2.49 in [63.3 mm] max
0.63 lb [0.29 kg] max Black
Polycarbonate plastic
J1 One
J2 One U-92A / U
U-174/ U
inserted into U-92A / U jack
N/A
N/A
Rev B Page 2
eqJAC-001 H ea dph one Audio Notc h Fil ter - U-174
SECTION 2 – INSTALLATION
2.1 Introduction
This section contains unpacking and inspection procedures, installation information, and post-installation checks.
2.2 Continued Airworthiness
Maintenance of the eqJAC-001 is on conditi on only. Scheduled inspection and/ or periodic maintenance of this unit is
not required.
2.3 Unpacking and Inspecting Equipment
Unpack the equipment carefully. Check for shipping damage and report any problems to the relevant carrier. Confirm
that the Authorized Release Certificate or Certificate of Conformance is included. Complete the on-line warranty card
from the Jupiter Avionics Corporation (JAC) website - www.jupiteravionics.com/warranty
2.3.1 Warranty
This product manufactured by JAC is warranted to be free of defects in workmanship or performance for 1 year from the
date of purchase from an approved JAC dealer or agency. This warranty covers the cost of all materials and labour to repair
or replace the unit, but does not include the cost of transporting the defective unit to and from JAC or its designated
warranty repair centre, or of removing and replacing the defective unit in the aircraft. This warranty does not cover failures
due to abuse, misuse, accident, incorrect battery use, or unauthorized alteration or repairs.
If the on-line warranty card is not completed, the product will be warranted from the date of manufacture.
Contact JAC for return authorization, and for any questions regarding this warranty and how it applies to your unit(s). JAC is
the final arbiter concerning warranty issues.
2.4 Installation Procedures
WARNING: Loud noise can cause hearing damage. Set the headset volume to minimum before
conducting tests, and slowly increase the volume to a comfortable listening level.
CAUTION: The power input circuitry of the unit may be damaged if the installation does not conform to the
wiring instructions in this manual.
2.4.1 Installation Limitations
Those installing the eqJAC, on or in a specific type or class of aircraft, must determine that the aircraft installation
conditions meet standards. The eqJAC may be installed only by following the applicable airworthiness requirements.
2.4.2 Cabling and Wiring
The eqJAC plugs directly into a standard aircraft audio system headset connector. All wires to said connector shall be
selected in accordance with the original aircraft manufacturer’s maintenance instructions, or AC43.13-1B Change 1,
Paragraphs 11-76 through 11-78. Unshielded wire types shall qualify to MIL-W-22759 as specified in AC43.13-1B
Change 1, Paragraphs 11-85, 11-86, and listed in Table 11-11. Follow the Connector Map in Appen dix A of this
manual.
Rev B Page 3
eqJAC-001 Headphone Audio Notch Filter - U-174
Installation and Operating Manual
2.4.3 Mechanical Installati on
The eqJAC-001 is mounted via insertion into a U-92A/U Jack. It requires no direct cooling.
2.4.4 Post Installation Checks
Do not attach this unit until the following conditions are met:
a) Ensure that the batteries are new or fully charged
2.4.4.1 Power on Checks.
Power up the aircraft’s systems and confirm normal operation of all functions of the eqJAC. Refer to
Section 3 (Operation) for specific operational details.
a) Begin with a headset attached. Confirm correct operation for both Mic and phones output. Do not procee
il the headsets are functioning correctly.
unt
b) Unusual buzzes, hums or other background audio are symptomatic of multiple grounds, or noisy external
systems such as blowers or pumps sharing wiring with the audio system.
2.5 Installation Kit
The eqJAC-001 does not require an installation kit.
2.6 Installation Drawings
The drawings and documents required for Installation can be found in Appendix A of this manual.
.
d
Rev B Page 4
eqJAC-001 H ea dph one Audio Notc h Fil ter - U-174
SECTION 3 – OPERATION
Power On
Notch Centre Frequency
Battery compartment
Headset
Battery Compartment
Battery Compartment Cover
Audio System
3.1 Introduction
This section contains the operating instruc ti ons for the eqJAC-001.
3.2 Controls and Annunciators
Cover Release
Connector
Control (NOTCH FREQ)
Connector
Annunciator
and Legend
3.2.1 Power On Annunciator
When the eqJAC-001 is connected to an aircraft intercom system and the internal batteries are charged, the Power
On Annunciator (green) will illuminate.
Note: If the eqJAC-001 internal batteries are allowed to fully discharge, the Power On light will be dark, and
there will be a complete loss of phones audio in the attached headset. If this happens, the headset should be
unplugged from the eqJAC-001 and plugged directly into the aircraft audio system.
Rev B Page 5
eqJAC-001 Headphone Audio Notch Filter - U-174
Compartment Cover
Retaining tabs
Battery
Installation and Operating Manual
3.2.2 Notch Center Frequency Control (NOTCH FREQ)
The Notch Center Frequency control is a rotary control that
allows the user to adjust the center position of the filtered
frequencies. The legend (NOTCH FREQ) to the left of the
control indicates the adjustment range (from 2 to 5 kHz).
Rotating the control clockwise (cw) will increase the
selected notch frequency, and rotating counterclockwise
(ccw) will decrease the notch frequency.
3.3 Operation
3.3.1 Microphone Operation
The eqJAC-001 functions when the Mic Bias from the Intercom System is detected, and allows the MIC INPUT audio
to be routed directly to the MIC OUTPUT.
3.3.2 Phone Operation
The eqJAC-001 PHONE INPUT has unity gain to the PHONE OUTPUT with the exception of the filtered frequencies.
3.4 Batteries
The eqJAC-001 requires four AA batteries. JAC recommends 2000 mAh (or higher) NiMH or alkaline batteries to
obtain the typical battery life.
Removal of the batteries WILL NOT change any internal configuration of the unit.
3.4.1 Inserting or Replacing the Batteries
To replace the batteries, remove
the battery cover by pressing
the battery lid release towards
the logo, lifting the lower end of
the cover, and then gently lifting
the lid up and away from the
body to release the two tabs
from the retaining slots.
The four batteries are located in
a compartment below the
cover.
Remove the batteries and insert
fully charged batteries,
matching the polarity marked
on the battery holder.
Release
Compartment
Rev B Page 6
eqJAC-001 Headphone Audio Notch Filter - U-174
Installation and Operating Manual
3.4.2 Battery Life
The operating duration of the eqJAC-001 with fully charged batteries before battery replacement is required is
typically >10 hours @ rated audio level. Battery life depends on the following factors:
Charge capacity of the batteries installed:
The higher the capacity of the batteries, typically specified as 2000 to 2400 mAh (milliamp-hours), the longer the
battery life.
T
he type of batteries installed and the operating temperature:
During low temperature operation, rechargeable batteries will lose capacity. When operating in low temperatures
use alkaline batteries for a longer batt er y life.
The phones volume level and usage rate:
The lower the volume level and the less often audio is output to the phones, the longer the battery life.
3.4.3 Battery Cautions and Warnings
CAUTION: Follow these guidelines to prolong battery life and minimize the risk of unit malfunction.
Do not leave rechargeable batteries uncharged for long periods of time.
Do not leave rechargeable batteries charging for extended periods (more than 48 hours)
To ensure that the unit functions correctly, insert the new batteries with the positive and negative poles aligned
as indicated in the battery compartment.
When replacing the batteries, use only new or fully charged batteries.
Do not mix old and new batteries as this can cause battery leakage and/or damage to the unit.
Do not mix battery types.
WARNING: Follow these guidelines to prolong battery life, and minimize the risk of fir e, chemical
burns, electrolyte leaks and/or injury.
FOLLOW the manufacturer's instructions for care and disposal of batteries.
DO NOT use sharp objects to remove the batteries.
DO NOT disassemble, puncture, burn or in any other way damage the batteries.
DO NOT let children handle the batteries.
USE ONLY recommended replacement batteries.
Rev B Page 7
eqJAC-001 H ea dph one Audio Notc h Fil ter - U-174
Installation and Operating Manual
Appendix A - Installation Drawings
A1 Introduction
The drawings necessary for installation and troubleshooting of the eqJAC-001 Headphone Audio Notch Filter – U-174
are in this Appendix, as listed below.
A2 Installation Drawings
DOCUMENT Rev
eqJAC-001 Connector Map B
eqJAC-001 Interconnect B
eqJAC-001 Mechanical Installation B
Rev B Page B1
JUPITER AVIONICS TEMPLATE AUTOCAD PORTRAIT SIZEA REV B.DWT
TITLE
APPROVED
PREPARED
CHECKED
L00N3
NCAGE CODE PART NO. SHEET
DOC NO.
CONFIDENTIAL & PROPRIETARY
TO JUPITER AVIONICS CORP.
Headphone Audio Notch Filter - U-174
eqJAC-001 1/1
eqJAC-001 Connector Map Rev B.dwg
TAT
Headset Connector
P2
U174/U or U-93A/U
MATING CONNECTOR
View of Headset mating connector
3rd Ring / PIN 4: Phones Output Lo
1st Ring / PIN 2: Phones Output Hi
TIP / PIN 1: Microphone Input Hi
2nd Ring / PIN 3: Microphone Input Lo
Aircraft Connector
P1
TJT-120 or U-92A/U
MATING CONNECTOR
View of Aircraft mating connector
1
4
3
2
PIN 1: Microphone Output Hi
PIN 2: Phones Input Hi
PIN 3: Microphone Output Lo
PIN 4: Phones Input Lo
JAC
10-10-18
AH
JAC
10-11-18
KDV
JUPITER AVIONICS TEMPLATE AUTOCAD PORTRAIT SIZEA REV B.DWT
TITLE
APPROVED
PREPARED
CHECKED
L00N3
NCAGE CODE PART NO. SHEET
DOC NO.
CONFIDENTIAL & PROPRIETARY
TO JUPITER AVIONICS CORP.
Headphone Audio Notch Filter - U-174
eqJAC-001 1/1
eqJAC-001 Interconnect Rev B.dwg
TAT
Aircraft Intercom System
Headphone Audio
High Impedance Headset
eqJAC-001
Notch Filter
Aircraft Headset Jack
150 Ohm
Phones
150 Ohm Mic
JAC
10-10-18
AH
JAC
10-11-18
KDV
0in
0mm
4.10in
104.1mm
101.6mm MAX
4.00in MAX
203.2mm MAX
8.00in MAX
0in
0mm
0in
0mm
2.49in
63.2mm
1.07in
27.2mm
FINISH:
NCAGE CODE
MATERIAL: N/A
N/A
PREPARED
eqJAC-001
TAT
CHECKED
SHEET
APPROVED
TO JUPITER AVIONICS CORP.
1/1
JUPITER AVIONICS TEMPLATE SOLIDWORKS PORTRAIT SIZEB REV B.DRWD O T
DOC. NO.
L00N3
PART NO.
TITLE
0.5 DEG
Headphone Audio Notch Filter - U-174
eqJAC-001 Mechanical installation Rev B.SLDDRW
UNLESS OTHERWISE SPECIFIED
DIMENSIONS ARE IN INCHES
ANGLES ARE IN DEGREES
TOLERANCES:
1 DEC PLACE: 0.1
2 DEC PLACE: 0.01
3 DEC PLACE: 0.005
ANGLES:
CONFIDENTIAL & PROPRIETARY
DRAWING NOT TO SCALE
Notes:
1. All dimensions 0.02in [0.5mm] unless otherwise specified.
2. Weight:
0.40 lbs [0.18 Kg] MAX. without batteries.
0.63 lbs [0.29 Kg] MAX. with batteries.
JAC
AH
10-10-18
JAC
KDV
10-11-18
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