compack manual.cdr
JK Audio
Universal Telephone Audio Interface
Users Guide
Telephone Interface Products
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 telephone connection.
ComPack also functions as a simple telecom interface for
your beltpack intercom system. This no-frills feature allows
you to connect the 3 pin XLR to your beltpack intercom
group to provide a full duplex, always-on connection to any
telephone network.
9. Battery Test
Button / LED
13. Visual Ring
12. Phone
Line Jack
3. 3.5 mm
Line Input
4. Male XLR Output / Com
17. Handset
16. Wireless Phone
Interface Jack
18. Handset
Type Selector
5. Headphone
1. Female
XLR Input
2. Mic/Line Selector
for XLR Input
7. 3.5 mm Line Input Level Control
8. Headphone Level Control
6. Female XLR
Input Level Control
Clip LED
10. Power
19. Battery
11. Phone Line On Hook / Off Hook
20. 9VDC
Power Jack
15. Keypad On /
Off Switch
14. DTMF
1. Female XLR Input
The female XLR input can be used for either the connection of a microphone or a line
level audio signal. This input can be used at the same time as the 3.5 mm line input.
2. 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.
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 headphones may be used.
6. 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.*
7. 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.
8. 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.
9. 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 distortion 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.
10. 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.
11. 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.
12. 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.
13. 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.
14. 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 telephone line.
15. 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.
16. 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 entering the unit.
The wireless interface on the ComPack works very well with most cellular
telephones. However, some wireless telephones generate excessive RF noise
which can be can be heard as a “chattering” or “motor boat” sound. The noise from
these particular telephones will be unacceptable for most broadcast applications.
17. 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. Dialing must be done with the existing telephone. Make
sure to leave the telephone handset off hook or disconnection will result.
18. Handset Type Selector Switch
You will need to 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 this basic description may help.
Switch Position
Handset Microphone Type
19. 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 battery should be removed if
ComPack is not going to be used for extended periods of time.
20. 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, battery 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 an additional AC
adapter, contact the distributor you purchased ComPack from and ask for a JK
Audio 9 volt power supply, JK Audio part # PS004.
ComPack General Operation
Connect your microphone (and/or line input) and headphones to the
input and output jacks on ComPack.
Connect the jack marked “phone line” to any standard analog telephone
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.
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 Telecom / Intercom Link
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.
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, inserted into the opening. The left position
(towards the XLR jacks) designates Line Output. The right
position (towards the volume controls) designates Com Link. The
factory default position of this switch is Line Output.
Connect your beltpack intercom XLR cable to the ComPack Com Link
Male XLR jack.
Your intercom headset should remain plugged into your
beltpack system, not directly into ComPack.
Female XLR
3.5 mm
1000 ohms, mic/line switch -35 dB pad
line level, 20k ohms, 250 mV, (-10 dBm) RMS
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
one 9 volt battery or AC power supply (included)
8” x 3” x 2.2” (20.3 x 7.6 x 5.6 cm)
1.5 lbs.
Shoulder strap, wireless interface cable and one 9 volt battery included.
Block Diagram
JK Audio, Inc.
Block Diagram
1/10/02 - WR
Phone Line
1/4" TRS
Switch Selects
XLR Function
Ring LED
Handset Type Switch
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
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.
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,
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.
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.
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.
FCC Part 15 Compliance
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.
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
JK Audio
2701 N. 45th Road, Sandwich, IL 60548
(815) 786-2929
[email protected]
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