JK Audio THAT-1 User manual

Telephone Interface Products
JK Audio
THAT-1
Telephone Handset Audio Tap
Users Guide

Connections
THAT-1 goes between the handset and the
telephone base of your telephone. Follow these
simplesteps......
1. Unplug the modular handset cord from your
telephonebase.
2. Using the black handset jumper cord that
we have provided, connect the telephone
jack of THAT-1 to the handset jack on your
telephonebase.
3. Plug your handset cord, and handset, into
thehandsetjackonTHAT-1.
4. Connect your audio equipment to the line
input and output jacks on THAT-1.
23
Features
To Phone Jack
This is a line level input for signals that you want to
send down the phone line. This jack can be
connected to an audio output such as the
headphone output jack on a tape recorder, the line
output of a PC audio card, or the line output from a
CDplayeroraudiomixer.
FromPhoneJack
This is a variable mic or line level output from the
telephone line. By adjusting the Volume control,
you can vary the level from microphone level to a
linelevelsignal.
This jack provides a mix of both sides of the
conversation. In other words, whatever you send
down the phone line will come back on this jack
mixed with the audio from the other side of the
call. This is not adjustable. We picked a suitable
mix ratio for most telephones.
The supplied adapter cable allows you to take the
left channel from a 1/8" mini stereo headphone or
mono microphone jack and attach it to the RCA
jacks on THAT-1.
Handset
w/
modular
plug
THAT-1
Existing
telephone
To wall jack
Amplified
speaker Audio equipment

Connections
THAT-1 goes between the handset and the
telephone base of your telephone. Follow these
simplesteps......
1. Unplug the modular handset cord from your
telephonebase.
2. Using the black handset jumper cord that
we have provided, connect the telephone
jack of THAT-1 to the handset jack on your
telephonebase.
3. Plug your handset cord, and handset, into
thehandsetjackonTHAT-1.
4. Connect your audio equipment to the line
input and output jacks on THAT-1.
23
Features
To Phone Jack
This is a line level input for signals that you want to
send down the phone line. This jack can be
connected to an audio output such as the
headphone output jack on a tape recorder, the line
output of a PC audio card, or the line output from a
CDplayeroraudiomixer.
FromPhoneJack
This is a variable mic or line level output from the
telephone line. By adjusting the Volume control,
you can vary the level from microphone level to a
linelevelsignal.
This jack provides a mix of both sides of the
conversation. In other words, whatever you send
down the phone line will come back on this jack
mixed with the audio from the other side of the
call. This is not adjustable. We picked a suitable
mix ratio for most telephones.
The supplied adapter cable allows you to take the
left channel from a 1/8" mini stereo headphone or
mono microphone jack and attach it to the RCA
jacks on THAT-1.
Handset
w/
modular
plug
THAT-1
Existing
telephone
To wall jack
Amplified
speaker Audio equipment

Operating (continued)
Specifications
If a conflict arises it will typically be on the line
input side. If you attempt to send voice band
signals down the line input jack and the distant
party complains that the level is too loud or
severely distorted (clipping), try to lower the
transmit signal on your audio equipment. If this
does not help, discontinue use immediately.
LineInput: Connector RCAPhonoJack
InputImpedance 20kohms
Level 250mVRMS
Isolation 1500VRMS
LineOutput: Connector RCAPhonoJack
OutputImpedance 2800ohms
Level 100mVRMS
Isolation 1500VRMS
HandsetandTelephoneconnectors:
Modular4pin/4wirehandsetjacks
HandsetCompatibility:
THAT-1 is designed to work with many dynamic and
electret handsets. Not for use with handsets that have
keypads.
Operating
The Handset / Line In button selects which
signal will be sent down the phone line; the
handsetmicrophone,orthelineinputjack.
When the Handset / Line In button is out, you can
use the handset to speak and listen as you
normally would. The sound that you hear on the
handsetisalwaysavailableonthelineoutputjack.
With the button in, the handset microphone is
disconnected and the line input is connected to
sendaudiosignalsdowntheline.
You can also use the Handset / Line In button to
turn off the handset mic if you are listening to the
line output signal over a loudspeaker. This will
prevent feedback between the handset
microphone and loudspeaker. In any case you
can always listen over the handset receiver.
Note: Not all telephones are built alike so we
can not guarantee THAT-1 will work with
any handset design out there. We
designed the interface to work with most
popular designs.
5
4

Operating (continued)
Specifications
If a conflict arises it will typically be on the line
input side. If you attempt to send voice band
signals down the line input jack and the distant
party complains that the level is too loud or
severely distorted (clipping), try to lower the
transmit signal on your audio equipment. If this
does not help, discontinue use immediately.
LineInput: Connector RCAPhonoJack
InputImpedance 20kohms
Level 250mVRMS
Isolation 1500VRMS
LineOutput: Connector RCAPhonoJack
OutputImpedance 2800ohms
Level 100mVRMS
Isolation 1500VRMS
HandsetandTelephoneconnectors:
Modular4pin/4wirehandsetjacks
HandsetCompatibility:
THAT-1 is designed to work with many dynamic and
electret handsets. Not for use with handsets that have
keypads.
Operating
The Handset / Line In button selects which
signal will be sent down the phone line; the
handsetmicrophone,orthelineinputjack.
When the Handset / Line In button is out, you can
use the handset to speak and listen as you
normally would. The sound that you hear on the
handsetisalwaysavailableonthelineoutputjack.
With the button in, the handset microphone is
disconnected and the line input is connected to
sendaudiosignalsdowntheline.
You can also use the Handset / Line In button to
turn off the handset mic if you are listening to the
line output signal over a loudspeaker. This will
prevent feedback between the handset
microphone and loudspeaker. In any case you
can always listen over the handset receiver.
Note: Not all telephones are built alike so we
can not guarantee THAT-1 will work with
any handset design out there. We
designed the interface to work with most
popular designs.
5
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