|Eliminate both metallic
and longitudinal Radio Frequency Interference (RFI) noise
RFI occurs when radio, television, business or citizens band
transmitting equipment is located near telephone facilities. Generally
this unwanted audio signal is picked up by telephone cable, which acts as
an antenna, and the signal is radiated directly into the telephone set.
There are two
forms of noise:
- Longitudinal noise is transmitted down one
or more wires in one direction and returns via earth ground
- Metallic noise is transmitted down one wire
and returns on a different wire
Charles offers suppression electronics in
three styles. Two designed for indoor use and one for outdoor use. Unlike other
capacitive filters, Charles eliminates both longitudinal and metallic noise.
is a specially compact network
contained in a shrink sleeve that measures approximately 2" long, .75" wide and
.50" deep. This compactness allows this network to be installed quickly and easily
with a phone set, including some slim sets.
The five individual conductors are color-coded and terminated with spade
lugs for easy connections. Use for indoor mounting only.
|Model 12-09ALS has the network contained in a
circular ABS housing, 1.3" diameter and .65" deep. All components are completely
The five individual
conductors are color-coded and terminated with large spade lugs for easy connection.
Only nonmagnetic hardware can be used if
this network is to be secured through the center hole as shown in the installation. This
unit is suited for outdoor mounting, such as in a station protector.
|Model CS1542A-RFS is a durable, beige-colored
plastic housing that measures 2" wide and 4.4" long and 1.2" thick and is
installed in series with the telephone line cord. The telephone line cord can be plugged
into the female receptacle and the standard 6" insulated lead with the male plug can
be inserted in the female wall jack. In the event a wall jack is not present, the
inside/outside wire can be hard-wired to the internal screw lugs.
The input modular is pre-wired through the RFS
network and may be stored within the housing if hard-wired installation is utilized.
Output is achieved through a 4-conductor modular jack receptacle mounted at one end of the
housing. Mounting screws are included. Use for indoor mounting only.
|Resistance (tip to tip &
ring to ring)
||9 Ohms (+/- 2 Ohms)
|Inductance (tip to tip &
ring to ring)
||2.2 MH (+/- 5%)
|Max. attentuation at voice
|Min. attentuation at 300 KHz
|Continuous current rating
|Intermittent current rating
|Coupling capacitance, tip to
||0.005 MFD (+/- 20%)