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| Charles Severe
Service RFI Suppression Networks provide dual performance suppression to minimize
interference in voice frequency loops. Radio Frequency Interference (RFI) occurs when a source of RF emission is located very close to a cable plant or where adequate shielding and bonding of the telephone facilities is not feasible, such as near or at the customer premises. |
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| Unwanted RF energy can be picked up by the
cable plant, which acts as an antenna. These unwanted signals are demodulated to voice
frequency and carried directly to the telephone set.
Both metallic and longitudinal RF interference are attenuated by Charles high performance Severe Service RFI Suppression Networks.
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Features |
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| Model 12-14C allows
the "notch" (or peak attenuation) of at least - 68 dB to be varied by 1120 KHz
in eight user-selected steps. Eight DIP switches allow the attenuation notch to be closely
turned to the known center frequency of the identified unwanted RF emission.
Model 12-15D provides superior broadband attenuation of -90 dB at 1000 KHz in cases where the center frequency of the RF emissions cannot be identified or there are multiple RF sources. This UL listed product eliminates the need for expensive and time-consuming signal tracking equipment. Audible RF noise may also be created within the telephone set. Circuits and certain components within a telephone set can act as both antenna and receiver (demodular) for RF emissions from a nearby source. Maximum performance of any RFI suppression network can not be assured in such situations.
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| Specifications |
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| Model 12-14C | Model 12-15D | ||
| Insertion Loss at 104 Hz | 0.2 dB | 0.5 dB | |
| Critical Frequency | 700-1820 KHz | 830 KHz | |
| Attenuation Distortion (200 to 3400 Hz) |
0.1 dB | 0.1 dB |
Ordering Information |
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| 12-14C | Water-resistant
housing Spade leads that mount virtually anywhere Band selector switch tunes filter to specific RFI frequency Spade terminals and turning chart is included |
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| 12-15D | Water-resistant
housing Spade leads Can be installed in any convenient location Inside plant wiring complies with Underwriter’s LaboratoriesÒ Standard 1459, 2nd Ed. |