JK Audio ComPack User manual

User Guide
ComPack
Universal Telephone
Audio Interface
JK Audio

2
Description
1. Battery Test
Button / LED
11. Visual Ring
Indicator
10. Phone
Line Jack
2. Wireless Phone
Interface Jack
9. Handset
Interface Jack
8. Handset Type
Selector Switch
3. 3.5 mm
Line Input
7. Mic/Line Selector
for XLR Input
6. Female XLR
Input
4. Male XLR -
Output / Com Link
5. Headphone
Jack
ComPack is a universal telephone audio interface that connects to
cell phones, PBX phone systems, and plain analog phone lines.
Perfect for remote broadcasts, IFB feeds, or interviews over any tele-
phone connection.
ComPack also functions as a simple telecom interface for your belt-
pack intercom system. This no-frills feature allows you to connect
the 3 pin XLR to your beltpack intercom group to provide a full du-
plex, always-on connection to any telephone network.
1. Battery Test Button / LED
To test the battery, simply press the Battery Test button on the side of
the unit. If the LED lights, the battery is still good. The unit may still
function if the LED does not light, but there will be significant audio dis-
tortion and a loss of level as the battery continues to discharge. Under
normal use you should get at least 20 hours of continuous use from one
fresh 9 volt alkaline battery.

3
Features
2. Wireless / Cellular Telephones
ComPack comes equipped with a built in cellular telephone interface.
This 1/4” wireless interface jack accepts a special 1/4” to 2.5 mm cable
provided with the unit. This interface will work with any wireless phone
that can accept third party headsets and earpiece headsets.
Some wireless telephones have the standard 2.5 mm jack while others
have proprietary jacks. Adapters to convert the proprietary jack to the
standard 2.5 mm jack are available for most wireless telephones
through local electronic stores or their respective telephone dealers.
When using the wireless interface, it is important to keep your wireless
telephone 12” - 24” away from the ComPack and any microphone or
headphone cables. This will help prevent unwanted RF noise from en-
tering the unit.
The wireless interface on the ComPack works very well with most cellu-
lar telephones. However, some wireless telephones generate exces-
sive RF noise which can be can be heard as a “chattering” or “motor
boat” sound. The noise from these particular telephones will be unac-
ceptable for most broadcast applications.
3. 3.5 mm Line Input
The 3.5 mm input is a mono, line level input. This input can be used at
the same time as the XLR input.
4. Male XLR - Output / Com Link
The Male XLR output can be used in two ways. As a balanced, fixed
level output or as a telecom link for your beltpack intercom system.
5. 1/4” Headphone Jack
The headphone output is a 1/4” 3 conductor jack. Both the tip and ring
of this jack contain the same audio signal. Either mono or stereo head-
phones may be used.
6. Female XLR Input
The female XLR input can be used for either the connection of a micro-
phone or a line level audio signal. This input can be used at the same
time as the 3.5 mm line input.
7. Mic / Line Selector Switch
The Mic / Line Selector Switch determines whether the female XLR is
to be used as a mic level or line level input.

4
Features
8. Handset Type Selector Switch
Select the handset microphone type of the telephone that ComPack is
connected to when using the PBX handset interface. Trial and error
works faster than a chart of handset types, but the following may help:
Switch Position Handset Microphone Type
A Electret
B Dynamic
C Carbon
9. Handset Interface
If you cannot get to an analog phone line or if the phone system is a
digital or analog PBX, ISDN, or a key telephone system, you can use
the built-in handset interface. Simply disconnect the handset from the
coily cord and plug the cord into the PBX Handset Interface Jack. Dial-
ing must be done with the existing telephone. Make sure to leave the
telephone handset off hook or your call will be disconnected. Do not
connect a handset to the ComPack; you must talk through your mic.
10. Phone Line Jack
Use this jack to connect to standard analog telephone lines or a fax /
modem adapter for analog cell phones. A 60” RJ-11 cable is provided
with the unit. This jack should not be connected directly to digital PBX or
ISDN phone systems.
11. Visual Ring Indicator
The Ring LED will flash when there is an incoming call from the phone
line. This feature is disabled when ComPack is being used with the
handset interface or the wireless phone interface.
12. Female XLR Input Level Control
The Mic Input volume control adjusts the level of audio from the female
XLR input. Adjustment of this control determines the level of audio you
send down the phone line from this input.*
13. 3.5 mm line input level control
The Line Input volume control adjusts the level of audio from the 3.5
mm input. Adjustment of this control determines the level of audio you
send down the phone line from this input.*
*The FCC requires that a limiter be present in any device that connects
to a phone line. The peak limiter within the ComPack will help to control
the audio level sent down the phone line so it does not exceed the
maximum audio level specified by the FCC.
14. Headphone Level Control
The headphone volume control adjusts the level of audio sent out the
1/4” headphone jack. Adjustment of this control will determine the level
of audio you hear in your headphones.

5
18. DTMF
Keypad
12. Female XLR Input
Level Control 13. 3.5 mm Line Input Level Control
14. Headphone
Level Control
19. Phone Line - On
Hook / Off Hook Switch
17. Keypad
On / Off Switch
20. Power
Switch
15. Battery
Door
16. 9VDC
Power Jack
Clip LED
Features
15. Battery Door
The easy change battery door can be opened by inserting a small object
into the slot, such as a coin or fingernail, and lifting up and out. The bat-
tery should be removed if ComPack is not going to be used for ex-
tended periods of time.
16. 9 VDC Power Jack
ComPack is powered by either one 9 volt battery or the included AC
adapter. The provided AC to DC adapter is a high quality, regulated
power supply. When the power supply is connected to ComPack, bat-
tery power is bypassed. This AC adapter is for powering the unit only, it
does NOT charge the battery. Make sure to use only the supplied AC
adapter with ComPack. Using any other adapter can cause poor audio
quality and/or damage the unit. If you need a replacement AC adapter,
contact the dealer you purchased your ComPack from and ask for a JK
Audio 9 volt power supply, JK Audio part # PS008.

6
17. Keypad On / Off Switch
This switch disables the DTMF keypad to prevent tones from being
blasted down the phone line during a broadcast. You should leave this
switch in the off position when using the wireless phone or PBX handset
interface.
18. DTMF Keypad The telephone keypad is equipped for tone dialing
only. You may use the keypad at anytime during a call but keep in mind
that transmit audio is muted during a keypress. This keypad should only
be used to dial calls when the unit is connected directly to an analog tele-
phone line.
19. Phone Line Switch
This switch acts as the switch-hook for the telephone line. The Hang Up
position is the normal on-hook position when you are not using the line or
you are waiting for a call. When you want to place a call, or when a call
comes in, switch to the Dial/Talk position. When using the Handset or
Wireless Interface, the switch should remain in the Hang Up position at
all times.
20. Power Switch
The power switch should be left in the off position any time the unit is not
being used or battery drain will occur. The unit will retain a phone line
connection if the power switch is turned off during a call.
Features

7
ComPack General Operation
1. Connect your microphone (and/or line input) and headphones to the
input and output jacks on ComPack.
2. Connect the jack marked “phone line” to any standard analog telephone
line
Or disconnect the handset on an existing telephone and plug the coily
cord into the “PBX handset interface” jack on ComPack
Or using the supplied cable, connect the “wireless phone headset” jack
to the 2.5 mm earpiece jack on your cellular phone.
3. Turn on the power switch, flip the phone line switch to dial/talk*, flip the
keypad switch to on*, and dial your call.
*When using the wireless phone or PBX handset interface, the phone line
switch should be left in the Hang Up position and the Keypad switch should
be in the off position. All Dialing and answering of calls in these modes must
be done from the telephone itself.
ComPack also functions as a simple “no-frills” telecom link for your beltpack
intercom system. ComPack will provide bi-directional audio on pin 3 of the
male XLR jack to any industry standard intercom beltpack system. ComPack
does not provide power over this XLR jack nor does it require power from the
loop. ComPack will not recognize a “call” signal generated by your intercom
system or provide one.
1. Slide the Male XLR selector switch to the Com Link position. This switch
is located within a small hole near the power jack. Accessing the switch
can be done using a small blade screwdriver, or other such object, in-
serted into the opening. The left position (towards the XLR jacks) desig-
nates Line Output. The right position (towards the volume controls) desig-
nates Com Link. The factory default position of this switch is Line Output.
2. Connect your beltpack intercom XLR cable to the ComPack Com Link
Male XLR jack. The XLR jack is wired as:
Pin 1 = Ground
Pin 2 = Com in
Pin 3 = Com out
3. Your intercom headset should remain plugged into your beltpack system,
not directly into ComPack.
ComPack Telecom / Intercom Link

8
Block Diagram
RJ-11
Phone Line
Jack
1/4"
Headphone
Jack
FCC
signal
limiter
DTMF
Keypad
Line
Output
3.5mm
Line
Input
XLR
Input
JK Audio, Inc.
ComPack
Block Diagram
1/10/02 - WR
Intercom
LInk
Switch Selects
XLR Function
Clip
LED
mic/line
switch
Hybrid
Transformer
Handset Type Switch
Headset
Emulator
Circuit
RJ-22
Handset
Jack
Ring LED
1/4" TRS
Cellular
Interface
Hybrid
Transformer
Isolation
Transformer
PBX

9
FAQ’s
?How can I record my conversation?
!The male XLR, in "Line Out" mode provides a nice mix of both sides of
the conversation.
?How do I select which telephone interface I will be using (phone line,
PBX, or wireless)?
!Actually, all three connections are live all the time. Technically, you could
connect to all three at once, but since there is no way to equalize levels,
this "conference call" might not be the best quality connection.
?Will ComPack work with my model _______ cell phone?
!As long as your wireless phone has a 3-conductor, 2.5 mm earpiece jack
and accepts a generic 3rd party earpiece or headset, you should be OK.
?Can I talk on my cellular phone and record the conversation?
!No, most phones detect the presence of anything plugged into the head-
set jack and immediately disable the phone’s microphone and speaker.
?What if my cell phone does not have a 2.5 mm headset jack?
!Some phone manufacturers and many third party manufacturers sell
adapters that allow connection of a standard 3-conductor 2.5 mm plug.
You can often find these adapters where you purchased your phone, in
electronics stores or on the internet.
?Can I send and receive audio at the same time?
!Yes, but whatever audio you send into the ComPack will come back
mixed with the caller audio.
?Will your ComPack provide phantom power for my condenser mic?
!No, our devices will not provide phantom power. If you are connecting
your microphone directly to a ComPack, you should use a dynamic mic.
?What is the Com Link used for?
!Simply slide the Male XLR function switch to Com Link and you can con-
nect the ComPack Male XLR to your single channel beltpack intercom
system.
? Can I connect the ComPack to a powered beltpack line?
! Yes, the ComPack has a DC blocking cap so it will not be damaged if
connected to a powered line, although DC power is not necessary for
operation.

10
Specifications
FCC Registration
Your new JK Audio product has been registered with the Federal
Communications Commission (FCC). This product complies with the
standards in Part 68 of the FCC rules.
1. Connection and use with the nationwide telephone network
The FCC requires that you connect this telephone equipment to the
national telephone network through a USOC RJ-11C modular telephone
jack.
This equipment may not be used with Party Line Service or Coin
Telephone Lines.
This equipment is hearing aid compatible.
2. Information for the telephone company
Upon request from your local telephone company, you are required to
provide the following information:
a) The "line" to which you will connect the telephone equipment (that
is, your telephone number), and
b) The telephone equipment's FCC registration number. This can be
found on the bottom of your telephone equipment, and,
Inputs:
Female XLR 1000 ohms, mic/line switch -35 dB pad
3.5 mm Line level, 20k ohms, 250 mV, (-10 dBm) RMS
Outputs:
Male XLR Phone mix mode - balanced 600 ohms, 15 mV
(-25 dBm) RMS
intercom mode - bi-directional unbalanced
1/4” jack 8 ohms, 500 mW
Power: One 9 volt battery or AC power supply
(included)
Size: 8” x 3” x 2.2” (20.3 x 7.6 x 5.6 cm)
Weight: 1.5 lbs.
Shoulder strap, wireless interface cable and one 9 volt battery included.

11
FCC Registration
c) The ringer equivalence number (REN) for this equipment. The REN
is used to determine the quantity of devices which will be connected
to the telephone line. Excessive RENs on the telephone line may
result in the devices not ringing in response to an incoming call. In
most, but not all areas, the sum of the RENs should not exceed 5.0.
To be certain of the number of devices that may be connected to the
line, as determined by the total RENs, contact the local telephone
company.
3. Repair Instructions
If it is determined that your telephone equipment is malfunctioning, the
FCC requires that it not be used and that it be unplugged from the
modular outlet until the problem has been corrected. Repairs to this
telephone equipment can only be made by the manufacturer or its
authorized agents or by others who may be authorized by the FCC. For
repair procedures, follow the instructions outlined under the warranty
section of the manual.
4. Rights of the telephone company
If telephone equipment is causing harm to the network, the telephone
company may temporarily discontinue your telephone service. If possible,
they'll notify you before they interrupt service. If advanced notice isn't
practical, you'll be notified as soon as possible. You'll be given the
opportunity to correct the problem, and you'll be informed of your right to
file a complaint with the FCC. Your telephone company may make
changes in its facilities, equipment, operations or procedures that could
affect the proper functioning of your JK Audio product. If such changes
are planned, you'll be notified by your telephone company.
This equipment has been tested and found to comply with the limits for a
Class A digital device, pursuant to Part 15 of the FCC Rules. These limits
are designed to provide reasonable protection against harmful interference
when the equipment is operated in a commercial environment. This
equipment generates, uses, and can radiate radio frequency energy and, if
not installed and used in accordance with the instruction manual, may
cause harmful interference to radio communications. Operation 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 own
expense.
Changes or modifications not expressly approved by JK Audio can void the
user's authority to operate the equipment.
FCC Part 15 Compliance

ComPack is covered by a 2 year warranty to be free from
defective workmanship and materials. In the event that the
ComPack 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.
Warranty
06/06
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 © 2006 JK Audio. All Rights Reserved.