JK Audio BluePack User manual

Warranty
BluePack is covered by a 2-year warranty to be free from
defective workmanship and materials. In the event that the
BluePack needs repair, you must call us to get an
authorization, and then carefully pack and ship it to us. You
will pay for shipping to us and we will pay for return back to
you, UPS ground. No free repairs will be made if the defect
was caused by misuse, weather conditions, or other cause,
except for defective workmanship or materials. THERE ARE
NO EXPRESSED OR IMPLIED WARRANTIES WHICH
EXTEND BEYOND THE WARRANTY HERE MADE.
0909
JK Audio, Inc. 1311 E 6th Street, Sandwich, IL 60548 USA
Voice: [phone] Toll Free: 800-JK-Audio Fax: [phone]
[email protected] www.jkaudio.com
Copyright © 2009 JK Audio, Inc. All rights reserved.
BluePack
Wireless Audio Interface
JK Audio
User Guide

2
Introduction
BluePack allows live man-on-the-street interviews through a
cell phone that is equipped with Bluetooth* Wireless Technol-
ogy. This sleek belt pack provides a professional look and
feel to field reporters and remote talent.
BluePack pairs to your cell phone like a Bluetooth wireless
headset. This professional microphone preamp and powerful
headphone amplifier make sure the message gets through. A
3.5 mm stereo line input jack allows recordings to be mixed
into the broadcast.
You can also listen to stereo Bluetooth audio from music
players or notebooks equipped with the Bluetooth A2DP pro-
file.
With the latest firmware release, BluePack can now function
as a Master device, sending stereo audio to other devices
that support the A2DP profile.
Any Questions?
Before you pick up the phone... Please thumb through the
rest of this manual. You might find those deep technical
questions are covered on later pages.
* The Bluetooth word mark and logos are owned by the
Bluetooth SIG, Inc. and any use of such marks by JK Audio,
Inc. is under license. Other trademarks and trade names are
those of their respective owners.
15
This device has been tested and found to comply with the lim-
its for a Class B digital device, pursuant to Part 15 of the FCC
rules. These limits are designed to provide reasonable protec-
tion against harmful interference when the equipment is oper-
ated in a commercial environment. This equipment generates,
uses and can radiate radio frequency energy and, if not in-
stalled and used in accordance with the instruction manual,
may cause harmful interference to radio communication. Op-
eration of this equipment in a residential area is likely to cause
harmful interference, in which case the user will be required to
correct the interference at his/her own expense.
Changes or modifications not expressly approved by JK Audio
can void the user's authority to operate the equipment.
Shielded interface cables and AC power cord, if any, must be
used in order to comply with the emission limits.
The internal antennas used for this mobile transmitter must
not be co-located or operated in conjunction with any other
antenna or transmitter.
FCC-B Part 15 Compliance

14
Inputs:
Female XLR: Balanced, 2k ohms,
-35 dBu nom.
Stereo Line In: Unbalanced, 3.5mm,
20k ohm, -10 dBu nom.
Outputs:
Stereo Line Out: Unbalanced, 3.5mm,
100 ohms, -10 dBu nom.
Left: Mic at line level
Right: Bluetooth return
Headphone mode: 8 ohms, 1 watt per
Channel
Bluetooth
Standard: Bluetooth 2.0
Distance: 30 feet (10 meters)
Frequency response
Hands Free mode: 300 Hz - 3400 Hz
Headset mode: TX 30 Hz - 17 kHz
RX 30 Hz - 20 kHz
Power: One 9-volt battery
Size: 4.7” x 3.75” x 1.65”
(12 x 9.5 x 4.2 cm)
Weight: 10 ounces
Specifications
3
Safety Precautions
BluePack contains a headphone amplifier that
is more powerful than the typical consumer
product.
JK Audio products are designed for the broadcast industry.
The broadcast professional must be able to hear headphone
signals over the ambient noise level. From the cheering
crowd at a football game to trackside at a car race, the pro-
gram material or cues must be heard at high volumes without
distortion.
Road safety
Never use headphones while driving or cycling, etc. It can be
dangerous to turn up the volume even while walking. Doing
so may hinder your hearing and can be hazardous on the
roadways or at pedestrian crossings.
Note: While BluePack was designed to be very rugged and
durable, it is not waterproof and care should be taken to keep
the unit dry.

4
Features
1. This thumbwheel will control the level of your microphone input.
2. The peak LED indicates clipping on the input channel if the
level is set too high.
3. This control will adjust the level of audio from the 3.5 mm Aux
Send input jack.
4. The stereo LED flashes red when the BluePack has a stereo
headset listen-only audio connection to your Bluetooth device.
If the music is paused, such as when you receive an incoming
phone call or the music player is shut off, the red stereo LED
will turn off until the music resumes playing. This LED will flash
green when the unit is in Master mode, sourcing stereo A2DP
audio to a Bluetooth enabled headset device (see pg 8).
5. This LED flashes blue when setting up or using a Bluetooth
connection. See page 11 for timing diagrams. The LED will illu-
minate briefly when the unit is first powered on.
6. The Headphones control will set the level of audio sent to the
headphone output jack.
7. This red LED indicates when the power is turned on.
8. Press this Power button in to activate the unit. Press again to
turn the unit off.
9. The blue Multi-Function Button (MFB) is used to establish a
connection with your Bluetooth enabled cell phone, laptop or
other device.
1 2 3 4 6 75
9 8
peak
13
FAQs
?If I have an audio source connected to the Aux Send
input, will that audio also be present at the Output
mini jack?
!No, the stereo mini jack output only contains audio from
the Mic input and the Bluetooth source. This input would
be a good place to add background music or sound clips
during a live interview that is being sent to your broadcast
studio over your Bluetooth connection.
?Can I send and receive audio at the same time?
!Yes you can! You can have full duplex conversations
when your BluePack is in Headset mode and you call
someone with your cell phone, or when you are in Master
mode and you are paired with another Bluetooth headset.
?My BluePack won’t pair with my cell phone. Why
won’t it accept the PIN?
!If this is the first time you have paired the BluePack with
this cell phone, make certain you are in Pairing Mode and
not Idle Mode. You must hold the MFB in for a full 5 sec-
onds to reach pairing mode the first time you connect.
?Can I have full duplex stereo conversations if my ste-
reo headset uses A2DP?
!No, the A2DP profile is only used for stereo music stream-
ing. Full duplex conversations will be in mono.
?What is the difference between the profiles used?
!There are currently at least 28 profiles that may be used
for Bluetooth communication. BluePack is compatible with
the three typically used in cell phones and headsets:
A2DP (Advanced Audio Distribution Profile) used
for stereo music streaming.
Headset Facilitates mono, full-duplex audio between
two paired devices.
Hands-Free Similar to Headset profile, but allows the
receiving device more control over the call,
such as volume, accept/reject/end a call.

12
?What is the range of the Bluetooth transmitter/
receiver?
!BluePack will transmit and receive audio signals up to 30
feet (10 meters) from your Bluetooth device. Because
transmitting signals over longer distances will require
more power, you should keep BluePack as close as pos-
sible to your Bluetooth device to conserve battery power.
?Can I pair my BluePack to two cell phones and send
my audio to two locations simultaneously?
!No, your BluePack can only be paired to one Bluetooth
enabled device at a time.
?Can I use my Bluetooth headset with my cell phone
while I have my phone paired to the BluePack?
!No, your cell phone can only be paired to one Bluetooth
enabled device at a time. In the standard mode of opera-
tion, your cell phone will be paired to our device as if the
BluePack were a headset. So you need to use a micro-
phone and headphones connected to the BluePack.
?Why is the peak LED still red after I turned down the
mic volume level?
!The microphone and Aux Send are a combined input. If
you see this red LED flashing, you should decrease the
Mic and/or Aux Send input levels until the combined input
is no longer clipping.
?How long will the battery last?
!Based on our tests using a standard alkaline battery, with
BluePack about 1 meter from a Bluetooth device the bat-
tery should last for about 10 hours under normal use. Lith-
ium batteries can significantly increase the battery life, but
at a higher cost. As an indicator of low battery, the red
power LED will grow dim and then extinguish a short
while before the battery is completely exhausted and the
unit shuts down.
FAQs
5
Connection
1. Connect your headphones to this 1/4” jack. The 1 watt stereo
headphone output gives you a mix of the XLR mic input, 3.5
mm Aux Send input and Bluetooth audio.
2. The unbalanced 3.5 mm stereo fixed line level output jack pro-
vides your full bandwidth microphone signal on the left channel
and Bluetooth audio on the right channel.
Like any phone call, live interviews are limited to 3.4 kHz voice
bandwidth back to the station. This stereo output jack allows
you to make a full bandwidth recording using your favorite re-
corder for transfer back at the station or over the web.
3. Connect the output of your other audio equipment to this unbal-
anced stereo 3.5mm Aux Send jack. This enables you to add
background music or sound clips to your Bluetooth broadcast.
This audio is not present at the Stereo Output but will be sent
to the Headphone jack.
4. Connect your dynamic microphone to the XLR jack. This de-
vice will not provide phantom power for a condenser type mi-
crophone.
You can use both the balanced XLR and unbalanced 3.5 mm
inputs simultaneously. The line level Aux Send input allows re-
cordings to be mixed into the broadcast with your microphone
1 2 3 4

6
Bluetooth Wireless Technology
Establishing a Bluetooth connection varies with different cell
phones. On your phone, find and select the option to set up a con-
nection. Press and hold the blue button (Multi-Function Button or
MFB) on BluePack for a full 5 seconds and release. The blue LED
will flash rapidly, about every 100 ms, as BluePack enters Pairing
Mode.
Now go to your Bluetooth device and search for Bluetooth connec-
tions. If this is the first time you have paired with this device, select
the option to add an audio device. When the cell phone has found
the new device, select from the list the device ID of "JKBPxxxx"
where the “xxxx” corresponds to the last 4 digits of the unit’s serial
number. Enter “Yes” when asked to Bond with this device. Enter
the pin number as "0000". The BluePack can maintain up to 16
devices in its connection history to make reconnecting to a previ-
ously used device simpler and quicker.
Tech Note: There is a difference between “Pairing Mode” and “Idle
Mode”. The very first time you connect to a new device
you must be in Pairing Mode. When you hold the Blue-
tooth MFB in for 2 seconds and release, the blue LED
will come on steady for a moment, then it will flash at a
rate of 2 seconds off and 200 ms on. This first stage is
Idle Mode. Holding the MFB in for 5 seconds before
release will activate pairing mode. In pairing mode the
LED flashes rapidly, about every 100 ms. Once in pair-
ing mode, any Bluetooth enabled device within range
can pair with BluePack. After pairing is complete, the
connection to that device is secure.
When bonding is complete, the blue LED will flash at a rate of 1
sec on, 2 sec off. Once BluePack has been added to your cell
phone, subsequent connections can be made more quickly from
Idle Mode.
To disconnect from the Bluetooth device, simply press the MFB
and hold for 5 seconds. Depending on the model of cell phone, if
left unused in Idle Mode or if a live call is disconnected, the
BluePack may automatically disconnect Bluetooth.
To clear the connection history and return to factory reset, hold the
MFB button in for at least 20 seconds. After resetting, the
BluePack will return to pairing mode. 11
Block Diagram

10
Applications
Telephone Interviews
Call out and interview other people as part of your pre-game show.
Connect your mic and headphones as shown and send audio
through the line output to your laptop for live streaming or to your
portable recorder for later broadcast.
Portable
recorder
BluePack in Master mode
Configure the BluePack in Master mode, pair it with a Bluetooth
enabled stereo headset and send stereo audio to the headset.
Then tap the MFB to switch to Hands Free mode and have a full-
duplex conversation.
Portable
audio
player
7
The Bluetooth interface will first attempt to connect in Hands Free
mode to a cell phone, allowing 3.4 kHz telecom bandwidth. If this
is not available, it will attempt to connect in Wireless Headset
mode to any product, such as a laptop computer, that allows a
Bluetooth wireless audio connection. The Wireless Headset mode
offers 20 kHz audio bandwidth.
BluePack supports A2DP, Hands Free and Headset profiles with
BlueCore 5-Multimedia technology. In Headset mode, you will be
able to receive full bandwidth stereo audio from any cell phone that
supports A2DP. In Master mode, you can send full bandwidth ste-
reo audio to any A2DP compatible device. By default, the
BluePack will connect in headset mode. See Page 8 for more infor-
mation on Master and Headset modes.
While all phones and portables are different, typically if you con-
nect in cell phone Hands Free mode, you will have a mono full du-
plex connection. If you connect to a music player, you will be in
stereo Headset mode. Consult your cell phone or portable device
for more details.
Bluetooth Wireless Technology
Bluetooth LED pattern after Bonding
Bonded
2 seconds off, 1 second on
Idle Mode
2 sec off, 200 ms on
Initialize
2 sec off, 2 sec on
Bluetooth LED pattern to initiate Bonding
Pairing Mode
100 ms off,
100 ms on
Hold Bluetooth MFB in at least 5 sec to
reach Pairing Mode the first time
a new device is connected,
> 2 sec thereafter to easily
connect from Idle Mode

8
Bluetooth Wireless Technology
Master or Headset
Your cellular telephone is a good example of a device operating in
Master mode. In default mode your cell phone will see the
BluePack as if it were a headset. When the BluePack is placed in
Master mode, it can send stereo audio to stereo earphones or the
BluePack can be paired to a headset for full duplex conversations.
There are many different profiles available for Bluetooth communi-
cation. Any devices that you have interconnected must be pro-
grammed with the same profiles. Most newer cellular telephones
use any combination of Headset, Hands-Free and/or A2DP proto-
cols. A2DP is the only profile that will enable BluePack to send ste-
reo audio in Master mode so the headset device it is paired to must
be equipped with the same profile.
Switching to Master mode
When pairing to another Bluetooth enabled device, the BluePack
will connect in headset mode by default. If you want to switch to
Master mode, you should start from the Bluetooth power-off state.
Power to the unit should be turned on, but with no Bluetooth activ-
ity enabled and no signal from the blue LED. Hold the MFB down
for greater than 10 seconds but less than 15 seconds, then release
the button to change roles. The next time a Bluetooth connection is
enabled on your BluePack, it will be in stereo Master A2DP mode.
To toggle between stereo A2DP and mono Hands Free profiles
(which can only be done while the unit is in Master mode), simply
tap the MFB button once for each change of state.
The St LED on the top of the BluePack will flash green when the
device is in Master mode and red when it is in Headset mode. The
timing of the LEDs while pairing with another device should remain
the same for either state.
The connection history will maintain up to 16 devices in Master
mode in addition to the 16 devices it keeps in the Headset mode
history.
9
Applications
Live Man-on-the-Street Broadcasts
Cover that breaking news story, conduct live interviews from the
convention floor or broadcast play-by-play action from the football
field.
Connect your microphone and headphones to the BluePack as
shown, then establish a Bluetooth connection to your wireless
phone. Dial up the studio and you are ready to go. Add pre-
recorded sound clips or background music to your interviews
through the Aux Send input.
Portable
audio
player
Mic Pre-amp
Connect your dynamic microphone to the XLR jack and connect
the line level 3.5 mm output to your other audio equipment. Use the
thumbwheel on the top of the BluePack to set the volume level for
the mic input.
Audio
Console