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The LIC-39C isolation coupler
is used to connect a logging recorder to telephone circuits. It
provides a balanced line-input, transformer isolation, capacitive
coupling, RF bypass, and balanced line-output. A voltage sensing
mute circuit prevents voice activated recorders from false
triggering when the coupler is connected to a voltage controlled
telephone line. An optically isolated ring sensing circuit permits
caller ID information to be recorded if it is present on the
The high impedance input circuit
permits connection to balanced and unbalanced audio sources, with
minimal loading. No internal or external power is required, 3"L
x 2"W x 1"H. It has a six foot input cable and an eighteen
inch output cable, both are terminated with RJ-11 phone plugs.
The input cable (normally the long cable with a modular RJ-11 telephone
style plug pre-installed on the end) should be connected to your
telephone line. If the modular plug is not used, connect the red wire in
the input cable to one side of the circuit and the green wire to the
other side of the circuit. Polarity is not important.
Connect the other cable (normally the short cable with a modular RJ-11
telephone style plug pre-installed on the end) to the audio input of
your recording equipment. With Omnicron Total Recall recorders this
cable should plug into one of the line input jacks on the back of your
If the coupler was special ordered, the
cables and terminations may have been changed to match your specific
are no switches or user adjustments. If the coupler is connected to
a standard telephone line, there will be a DC voltage present that
is higher when the circuit is not being used than when the line is
in use. Noise on the telephone line will not be coupled to the
output of the coupler when the phone is not in use and the voltage
on the line is greater than 35 volts DC. When the phone is in use
and the voltage drops below 35 volts DC, this circuit permits all
sounds on the couplers input to reach its output.
LIC-39C also has circuitry that senses when your phone line is
ringing and it does not mute the audio between rings when the phone
line voltage is high. Without this additional feature, your recorder
would not be able to record caller ID information.
of the LIC-39C coupler on telephone circuits which are not private
may be regulated by local tariffs. If local tariffs apply, contact
your telephone company for application assistance.
not use the LIC-39C on a party or pay phone line, since it will
record the conversations of all parties. This would be unlawful.
law 90-351 title 18, section 2511, sub section 2D, requires that at
least one participant in a recorded conversation be informed of the
recording. Check your state and local regulations for further
LIC-39C is warranted to be free from defects in materials or
workmanship for one year from the date of purchase. Damage to
products resulting from physical abuse or electrical misuse voids
this warranty. Out of warranty units will be repaired for a nominal
handling charge plus the cost of parts and transportation. If the
unit requires service, disconnect the unit and return it to the
factory or your place of purchase for repair.
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