JK Audio AutoHybrid User manual
JK Audio
AutoHybrid™
User Guide
Auto-Answer Hybrid
AutoHybrid Auto-Answer Hybrid
iiii
Welcome
Thank You
Thank you for purchasing the
JK Audio AutoHybrid. Please
read this guide for instructions on
setting up and using your new
Auto-Answer Hybrid.
Getting Assistance
If you have any questions,
call us M-F: 8:30am-5:00pm (CT)
In the US & Canada (Toll-Free)
800-552-8346
All other countries dial:
815-786-2929
Email us at:
Or, check out our FAQ section for
answers to common questions.
Limited Warranty
AutoHybrid is covered by a 2 year
warranty to be free from defective
workmanship and materials. To obtain
service, contact JK Audio by phone or
email for return authorization. Once
authorized, you will carefully pack and
ship the faulty product and all acces-
sories to us. You will pay for shipping
to us and we will pay for return back
to you.
This warranty does not cover
damages due to accident, weather,
re, ood, earthquake, misuse,
unauthorized repairs or modications,
or damages occurred in shipping, only
defective workmanship or materials.
There are no expressed or implied
warranties which extend beyond
the warranty here made.
Contents iii
Contents
Overview 1
Controls & Indicators 2
Inputs & Outputs 3
Connecting Your AutoHybrid 4
Using the AutoHybrid
5Auto-Answer, Remote Screw Terminal
6Null Adjust
5
FAQ's 7
Specications 8
AutoHybrid Auto-Answer Hybrid
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Accessories
RA4 Rack Panel
Holds 4 AutoHybrids in a 1U rack space
Passive Operation
- Draws power from the phone line
Full Duplex Hybrid
XLR Send Jack
XLR Receive Jack
Auto-Answer / Disconnect
Hybrid Null Adjust
- Up to 20 dB Separation
Detachable Remote Screw Terminal
Block Provides:
- O-Hook Control
- Release Control
- OH LED Signal
Features
Overview 1
Overview
Introducing the AutoHybrid.
The JK Audio AutoHybrid is a simple, passive, auto-answer / disconnect
telephone line hybrid. AutoHybrid allows simultaneous send and receive audio
through analog telephone lines. Not just another half duplex auto-coupler, this
is a full duplex AutoHybrid. Perfect for remote monitoring, IFB feeds, and many
simple studio, conferencing, and PA telephone interface applications.
AutoHybrid's dual transformer hybrid circuit provides a nominal 20 dB separation
of send and receive audio. This means that the level of your send audio on the
caller output jack will be approximately 20 dB less than your transmit level.
Balanced XLR input and output jacks provide easy connection to your
professional audio equipment and the detachable screw terminal block provides
easy access to remote features.
AutoHybrid Auto-Answer Hybrid
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Call Button
Press this button to answer or place
a telephone call.
OH LED (O-Hook)
Lit when you are on line with a call.
Drop Button
Press this button to drop a call.
Controls & Indicators
Auto-Answer
Press this switch to enable the
AutoHybrid to automatically answer
an incoming call and then disconnect
after the caller hangs up. Auto answer
will occur on the rst ring.
Null Adjust
Used to adjust the level of Send
audio that is present on the Caller
output jack.
Inputs & Outputs 3
Line Jack
Connect to a standard, single line,
analog telephone line.
Phone Jack
Connect a single line analog
telephone for call setup and dialing.
Remote Screw Terminals
Call: Momentary +5 VDC to seize line.
Drop: Momentary +5 VDC to release.
OH pulled to ground for OH LED.
Caller Output
Male balanced line level XLR output
contains audio from the phone line.
Send Input
Female balanced line level XLR input
for signals going into the phone line.
Inputs & Outputs
AutoHybrid Auto-Answer Hybrid
4
Connecting your AutoHybrid
1. Use the supplied RJ-11 cable to
connect the <Line> jack on your
AutoHybrid to an analog phone line
wall jack.
2. Connect the audio you wish to send
down the phone line to the XLR
<Send> jack on your AutoHybrid.
3. Connect the <Caller> XLR jack
to a line level input on your audio
equipment. The Caller output
contains audio coming from the
phone line. This audio signal will
contain the caller's voice and any
audio you send into the phone line
at approximately 20 dB less than
your transmit level.
Connecting Your AutoHybrid
Note: When you drop a call, any audio
delivered to the Send jack of AutoHybrid
will still appear on the Caller output jack.
AutoHybrid does not mute your Send
audio when the phone line is On Hook.
4. Connect an auxiliary telephone to
the <Phone> jack to dial calls. After
connecting a call, press the <Call
Button> on the AutoHybrid and you
may then hang up the telephone.
When you are nished with the call,
press the <Drop Button> to release
the phone line (place the line
on hook).
Using Your AutoHybrid 5
Using Your AutoHybrid
Auto-Answer
When the <Auto-Answer Button>
is in the in position, AutoHybrid will
answer on the rst ring. AutoHybrid
will look for a CPC disconnect signal
from the phone company to determine
when a call has disconnected. This will
generally take only several seconds
but can take up to a minute. If you
are using a simulated analog phone
line provided by a PBX system, the
system must be congured to send a
disconnect signal for the AutoHybrid's
auto-disconnect function to operate.
The CPC disconnect signal must be
set at 300 ms minimum.
Remote Screw Terminal
1234
Call Drop OH LED Ground
The detachable remote control screw
terminal block on the back of the
AutoHybrid provides connection to
switch contacts for remote operation.
A momentary +5 VDC applied to Pin 1
takes the phone line o-hook. Another
momentary +5 VDC applied to Pin 2
will drop the call.
Pin 3 is an open collector opto-isolator
terminal that is pulled to ground while
AutoHybrid is o-hook. This terminal
is protected by a 220 ohm series
resistor. You can light a remote LED
by simply connecting your LED from
+5 VDC to pin 3.
AutoHybrid Auto-Answer Hybrid
6
Using Your AutoHybrid
Null Adjust
The <Null> is a 15 turn pot used to
determine how much of your <Send>
audio is delivered to the <Caller>
output jack. Use a small atblade
screwdriver to make adjustments to
this control.
To nd the absolute null for any
telephone line, follow this procedure:
1. Place a call to a quiet location.
2. Send a signal into the AutoHybrid
<Send> jack at a moderate level. A
test signal or tone works best.
3. Connect the <Caller> output jack
to a meter or scope, or listen to this
signal through your external audio
equipment.
4. Try to remember the position of the
adjustment screwdriver blade and
the number of turns you are making
as you rst adjust clockwise, then
back to the original position, then
counter clockwise.
When the level of this signal is at a
minimum, you have achieved the
maximum null for the phone line. The
maximum null you can achieve is
approximately 20 dB.
Note: The AutoHybrid null is adjusted
at the factory to provide the maximum
amount of null for typical phone lines. In
most instances the null does not have to
be adjusted.
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