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DOC NO.
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SHORT TITLE
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DOCUMENT DESCRIPTION
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APN-250-100
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C250 Microphone Setup
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Most any microphone can be used with the NCS-C250 due to the ability to set
impedance, level, electret voltage and/or other auxiliary voltages required for certain
microphones. Microphones with dynamic or electret elements are most commonly used
in communications applications and are the focus of this application note. Additionally,
requirements for microphones equipped with preamplifiers and DTMF encoders are
discussed.
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APN-250-101
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Parallel Configuration of Multiple NCS-C250s
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Multiple NCS-C250 Mobile Multi-Switchers can be connected in a parallel configuration
to share radios among multiple operating positions reducing the number of radios
required in a multi-operator dispatch operation. Examples are given for various radio
sharing configurations for addressing different dispatch requirements.
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APN-250-102
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C250 Repeater Thump Filters
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False COR signals from different radios can cause a ping-pong effect in repeat mode. NCS has incorporated Thump Filters
in the C250 Repeat Mode to help alleviate this problem. This note describes the operation of the Thump Filters.
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APN-250-103
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C250 Watchdog Timers
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The C250 incorporates Watchdog Timers to prevent interference to communications
in case of a malfunction. This note describes the operation of the Watchdog Timers.
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APN-250-104
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C250A Mechanical Dimensions
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This Application Note details the external dimensions and mounting provisions of the NCS-C250A Mobile
Multi-Switcher.
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APN-250-105B
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C250 Microphone Jumper Settings
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This Application Note shows jumpers settings for a wide variety of specific
microphones. (Revised 12 March 2008)
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APN-250-106
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Connecting Radios with Bridge Tied Load
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This Application Note shows how to connect radios that use a Bridge Tied
Load (BTL) Speaker Output to NCS equipment.
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APN-250-107
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Establishing Talk Groups
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Multiple agency incident response often requires the use of multiple talk groups to
reduce confusion and expedite communications between parties requiring common
communications. This Application Note describes how to set up multiple talk groups
using NCS-C250 Mobile Multi-Switchers.
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