JK Audio InlinePatch User manual

Telephone Audio Interface
PATCH
JK Audio
User Guide
INLINE

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The Inline Patch gives you access to the audio from both
sides of your telephone call. Simply install this little box
“inline” between the telephone wall jack and the base of
your telephone. You can use any single-line residential
(analog) corded or cordless telephone or if available the
data / modem port on a digital or PBX telephone. Add a
pair of powered speakers and everyone in the room will
hear both sides of the conversation. Separate volume con-
trols ensure that both sides of the call are heard at the
same level. Inline patch is not the same as a speaker-
phone. Only the person with the telephone handset can
talk while everyone else listens in. You can pass around
the handset with more control over your teleconference or
IVR demo.
You can also use Inline Patch to add audio to your conver-
sation, or send audio into the phone line instead of your
voice.
Description

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Connection
Inline Patch To analog RJ11
Wall Jack
Audio Equipment
To send audio into
phone line
Analog Telephone
Powered Speakers or audio
equipment to receive audio
from phone line
Setup for use with residential / analog telephones:
1. Unplug the telephone cord from the base of your tele-
phone.
2. Plug that telephone cord into the jack on the Inline Patch
marked “Phone Line”.
3. Using the telephone cable we have provided, plug one
end into your Inline Patch marked ‘Phone” and the other
end of the cable into your telephone.
4. Connect your audio equipment to the 3.5mm and / or XLR
line input and output jacks on the Inline Patch.
5. Connect the power supply to the back of the Inline Patch.

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Connection (continued)
Inline Patch
To digital or
PBX Wall Jack
To Data /
Modem
Port
Analog Telephone
Digital or PBX
Telephone
Audio Equipment
To send audio into
phone line Powered Speakers or audio
equipment to receive audio
from phone line
Setup for use with PBX phone systems:
Setup for use with PBX phone systems is the same as ana-
log telephones with one exception. Instead of connecting
the phone line jack of the Inline Patch to a wall jack, you will
connect to the data / modem jack of your PBX phone. You
will still need a regular analog telephone connected to the
phone jack of the inline patch. When dialing out you will
need to take the necessary steps to get a direct connection
to the main analog phone line (example: dialing 9 + 9 +
phone number). You will not physically use your PBX phone
while operating the Inline Patch. It simply acts as your con-
nection to the telephone line. Dialing, speaking, etc. will be
done through the separate analog telephone.

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Operation
Output Jacks
The Inline Patch has three audio output jacks on the back
panel. The 3.5 mm “stereo” jack has the phone line audio on
the left channel and your voice on the right channel. The sec-
ond 3.5 mm jack has both sides of the call combined on both
left and right channels. You may use either a mono or stereo
plug in this jack. The third output is a balanced male XLR
jack. The XLR jack contains only the audio coming from the
phone line with a nominal 20 dB of trans-hybrid loss.
There are three output controls on the front of the Inline
Patch. From Phone adjusts the level of your voice on both
output mini jacks. From Line adjusts the level of the audio
coming from the phone line on all three output jacks.
The Separation control is used to achieve the best match be-
tween your voice and the audio coming from the phone line.
When you send your voice into the phone line it comes back
to you mixed in with the audio from the other side of the call,
although it will be about 20 dB lower than your original trans-
mit level. This means that if your audio is sent at 0 dB, and
you receive the caller’s audio at –10 dB, then you would have
10 dB of separation between your voice and the caller audio.
The goal is to have a minimum amount of your voice coming
back to you from the phone line.
To fine tune the separation, first connect your audio equip-
ment (powered speakers, mixer w/ VU meter, etc.) to the
mixed mono output jack on the back of the Inline Patch. Next
turn the From Phone control all the way down and the From
Line control all the way up. Now place a phone call. Without
any audio coming from the other end of the call, hold down a
touch tone on your telephone while adjusting the Separation
control to find the most quiet position. Now turn the From
Line control to about 12:00 and use the From Phone control
to bring your voice up to a suitable level.

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Operation (continued)
The hybrid circuitry in the Inline Patch can provide a nominal
20 dB of transmit / receive isolation. When using the stereo
jack with stereo speakers, the 20 dB isolation will give you
substantial left / right separation. The separation on FM ste-
reo is typically around 20 dB.
Send Side (To Phone Line)
The Inline Patch includes a balanced female XLR jack and a
3.5mm (1/8” mono mini jack) to send audio down (or into) the
telephone line. These jacks can be connected to an audio
output such as the headphone output jack on a tape re-
corder, or the line output of a PC audio card, CD player or
audio mixer.
If you would like to use a microphone to add extra audio to
the call, you will first need to add an amplifier to your micro-
phone so that the signal is boosted to line level. You can use
both the XLR and the mini jack input at the same time, and
add it to the audio coming from the handset microphone.
The level of the audio you send through the input jacks into
the phone line can be adjusted with the Send control. Note
that this audio will come back mixed with the caller audio, so
be sure not to overpower the caller’s voice with your own au-
dio.
Off Hook - Norm Switch
This switch allows you to seize the phone line without using
your telephone. This switch can be remotely operated using
your own switch contacts connected to the back of the unit.
Simply wire a 3.5 mm plug to a normally open switch. A short
across tip and ring on a stereo plug will take the phone line
off-hook. You can also use a 3.5 mm mono plug.
Note: Seizing the phone line activates the internal circuitry of
the Inline Patch, essentially “turning it on”. The green LED on
the front panel only indicates that the unit is receiving power.

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Specifications
Inputs (to phone line):
Balanced Connector Female XLR
Input Impedance 1 k ohms
Level 250 mV RMS (-10 dBm nom.)
Line Connector 1/8” (3.5mm) mono mini jack
Input Impedance 20 k ohms
Level 250 mV RMS (-10 dBm nom)
Outputs:
Balanced Connector Male XLR
Output Impedance 50 ohms
Level 500 mV RMS (+12 dBm max.)
Stereo Connector 1/8” (3.5mm) stereo mini jack
Output Impedance 50 ohms
Level 250 mV RMS (+12 dBm max.)
Mono Connector 1/8” (3.5mm) stereo mini jack
Output Impedance 50 ohms
Level 250 mV RMS (+12 dBm max.)
Remote:
Connector 1/8” (3.5mm) TRS stereo jack
Connect tip to ring to go Off-hook
Phone line:
Connector RJ11C
Isolation 1500 volts
Phone:
Connector RJ11C
Voltage 32 VDC

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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 Ser-
vice 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 num-
ber. This can be found on the bottom of your tele-
phone equipment, and,
c) The ringer equivalence number (REN) for this
equipment.
The REN is used to determine the quantity of de vices
which will be connected to the telephone line. Exces-
sive RENs on the telephone line may result in the de-
vices 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.
FCC Registration

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FCC Registration (continued)
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 tele-
phone equipment can only be made by the manufac-
turer 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 net-
work, the telephone company may temporarily discon-
tinue 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 fa-
cilities, 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.

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?I'm using a CD player with an Inline Patch to send audio down the
phone line and then recording that audio with the caller's comments.
The CD audio is overpowering the caller audio even when I turn the
"From Phone" control all the way down. What's wrong?
!The "From Phone" control only adjusts the output of your voice that is
sent through your telephone. The audio you are feeding into the inputs
on the back of the Inline Patch comes back mixed with the caller's
voice. The Inline Patch does not attempt to separate audio sent into the
inputs, only your voice sent through your telephone. You'll have to
lower the "Send" level on the Inline Patch to correct this problem.
?There is a small amount of hum in the background of my recordings
made from the Inline patch. What’s wrong?
!Try turning up the “From Line” volume. That should decrease resis-
tance and help eliminate the hum.
?There is a loud hum on the output of my Inline Patch, even when noth-
ing else is connected. What else could it be?
!Make certain you are using the power supply that was shipped with the
unit. Power supplies are not all the same.
?We purchased an Inline Patch to take callers on our radio show. It
functions just as promised but we've now found that 20 dB of separa-
tion just really isn't enough for us. What can we do?
!The Inline Patch was designed primarily for interview recording and
telecom demos. If you're looking for something to put callers on the air
for a radio show you should purchase an Innkeeper digital hybrid. The
Innkeeper typically provides greater than 50 dB separation of send and
receive and has great sound quality. This is really the piece of equip-
ment you need.
?I recently purchased the Inline Patch, which works great, but I don't
seem to be getting as much volume out of the XLR output as promised
in your catalog. What's wrong?
!Check your XLR Cable. Some Sound Engineers are in the habit of con-
necting the "ground wire" (pin 1) and the "negative wire" together. This
is sometimes done to convert transformer output signals into a single
ended output, however, Inline Patch uses an active differential output
so grounding one of the hot pins will drop the output in half. Separate
these two wires and you should hear a difference.
FAQ’s