AH-5A BOGEN COMMUNICATIONS, AH-5A Datasheet - Page 76

• Manufacturer Part Number: AH-5A
• Description: Amplified Speaker/horn
• Manufacturer: BOGEN COMMUNICATIONS

Specifications of AH-5A

• Peak Reflow Compatible (260 C): No
• Leaded Process Compatible: No
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant

74
SINGLE-CONDUCTOR SHIELDED CABLE
Shielded Cable
Shielded cable refers to any conductor, or conductors,
wrapped in an electrically conductive shield. The two types
of cable most prevalent for audio installations are:
• Single-Conductor Shielded Cable
Single-conductor shielded cable is used to connect external
equipment to the unbalanced AUX inputs of amplifiers. The
center conductor carries the signal source and the shield
carries the ground between the amplifier and external equip-
ment. In addition to completing the ground return between
the electrical equipment, the cable provides a large amount
of noise and interference protection for the center conduc-
tor. The most common connector for this type of cable is
the Phono connector (a.k.a. the RCA connector). The con-
nector’s center pin connects to the internal conductor and
the skirt around the connector’s perimeter connects to the
shield of the cable.
WIRE TYPES
SHIELDED SPEAKER WIRE
Speaker Wire
The speaker wire best suited for paging systems is 2 con-
ductors in a jacket. The gauge of the conductors varies de-
pending on the installation. In many instances, a shielded
version of the speaker wire is used. The shield can be useful
to help protect the conductors from receiving electrical
interference from other electrical equipment in the area. The
shield is particularly useful when speakers are to be used as
microphones in talk back applications (see page 52 for more
information on talk back).
Jacket
Drain Wire (optional)
Jacket
Shield (optional)
Shield
Conductor
2 Conductors
LET US DESIGN IT FOR YOU...
• Two-Conductor Shielded Cable
Two-conductor shielded cable is typically used with balanced
microphones. Two internal conductors are required for the
low-impedance balanced microphones used in paging sys-
tems. The shield is wrapped around these conductors and
provides the same protection against electrical interfer-
ence and noise as single-conductor cable. Balanced micro-
phone inputs provide a ground connection point for the
shield. Without the ground connection, the shield would be
ineffective. Some microphones with push-to-talk switches re-
quire two more conductors to carry the switch closure back
to the amplifier. In this cable, the conductors for the switch
closure are not wrapped in the shield but rather carried in
the cable jacket outside of the shield. The most popular
types of connectors for microphone cable are screw termi-
nals and XLR connectors.
FOR FREE!!!
UTP
Unshielded Twisted Pair (UTP) wire has many uses but is
most common in data and telecom installations. It uses
solid conductors, typically 24 gauge. It has insulation to
withstand voltages similar to speaker wire and can be used
in 70V and self-amplified applications, as long as the thin
gauge and the associated higher resistance is accounted for.
Also because there is no shield, the use of UTP in talk
back applications (where the speaker acts as a micro-
phone) may lead to higher electrical noise on the talk back
signal. There are normally several twisted pair in a single
cable and these can be paralleled to approximate lower
gauge wires (see page 75).
NON-SHIELDED UTP WIRE
TWO-CONDUCTOR SHIELDED CABLE
(BALANCED MIC CABLE)
—SEE PAGE 82 FOR DETAILS
Jacket
Twisted Pair
Jacket
2 Conductors
Shield