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C250 Mobile Multi-Switcher
C150 Mobile Crossband Repeater
Rack Mounted Controllers
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List of Narrowband Radios   

C410 Trunking Delay Module  
C441 Multi-Switcher Combiner  
E116 DTMF Dial Pad  
C003 Headset Interface  

E216/E217 Microphone   
E214/E218 DTMF Microphone   
E410 Desk Microphone   
7210 Speaker
C250 Brochure  
QuickLinx-M Brochure  
QuickLinx-P Brochure  

C250 Data Sheet  

C250 Radio Cables Price List  

C250 Radio Cables Instruction Sheets  

C250 Main Unit Manual
C251 Expansion Unit Manual
C150 Manual
C410 Delay Module Manual
C441 Multi-Switcher Combiner Manual

----Mic Instruction Sheets----
NCS-E217 Hand Mic
NCS-E410 Desk Mic

Schematics, PCB Layouts and Cable Instruction Sheets  

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C250 Mobile Multi-Switcher
Interoperability Controller

Click for a larger picture. The NCS-C250 Mobile Multi-Switcher is an interoperability solution suited for First Responders that utilize multiple radios such as police, fire and EMS personnel. However, many customers have purchased the unit for dispatch purposes. The unit connects four radios to one microphone and two speakers. Specific features such as crossband repeating of up to 4 radios (VOX operated), Select/Unselect audio control and muting, and PA output make the unit more than a "microphone switch".

The NCS-C250 can be configured in systems to provide for sharing Click for a larger picture. of radios between multiple units thereby reducing the number of radios required, resulting in a reduction of overall system cost. Alternatively, the unit may be combined with an NCS-C251 Expansion Unit for control of up to eight radios.

The NCS-C250 and C250/C251 combination are also available mounted in standard 19" rack panels. These configurations include panel mounted Select and Unselect speakers, mic hook and handles. Individual lighted, speaker on/off switches are available.
Click for a larger picture.
Click for a larger picture.

Complete C250 Data Sheet
C250 Main Unit Instruction Manual
C251 Expansion Unit Instruction Manual


The NCS-C250 and NCS-C251 are available with several optional features to enhance their operation. All options are factory installed.
COR: Carrier detect circuit for crossbanding function. The option causes the RPT Function to be controlled by a digital busy signal from each radio. Highly recommended for significant improvement in quality of crossbanding. VOX detection comes standard.
Hook Switch: The option allows a hook switch or microphone hang up signal to be sent from the mic to all radios. The signal is passed to Selected radio(s) when the microphone is "Off-Hook". Worthwhile for set ups with radios programmed to scan or monitor when not in use.
Multi-Cast (Simulcast): Provides the ability to broadcast on multiple radios simultaneously. This feature may be enabled or disabled by the user.
Sidetone: Mixes the transmit (mic) audio at a suppressed level with the Selected radio’s receive audio to provide aural feedback when using a headset. The Sidetone signal is also output to the selected speaker to allow remote monitoring or recording of both sides of the radio communications. This feature can be enabled or disabled by the operator.



NCS is proud to offer Heil Sound, Ltd.© headsets and accessories for use with our products. Heil Sound has supplied its products to the commercial broadcast, entertainment and amateur radio industries for over 30 years and has a superb reputation for innovative and quality audio products.
Pro-Set4. The NCS-E304 and NCS-E305 (electret version) headsets have Click for a larger picture. stereo speakers, perfect for monitoring Selected and Unselected audio. The set contains a speaker phase reversal switch to reduce fatigue and enhance intelligibility. The microphone element has an optimized frequency response for clear voice articulation even under noisy radio conditions. The flexible left ear microphone boom has a variety of positions.
Pro-Set Plus! The NCS-E345 and NCS-E346 (electret version) are more robust versions of the NCS-E304 and NCS-E305 headsets. The Pro-Set Plus! has dual microphone elements for full range and enhanced communications. A slide switch provides switching between elements. Additionally, the boom swings 180 degrees for left or right operation. The headset contains a self adjusting cushioned headband.
Pro-Set Quiet Phone. The NCS-E314 and NCS-E315 (electret version) include all the attributes of the Pro-Set 4 and adds active noise cancellation technology to reduce ambient room noise. The unit includes an integrated Push-To-Talk soft touch switch. The set is supplied with a leatherette carry bag.
HS-2 "Magnum" PTT Hand-Switch The NCS-F230 is used with the Pro-Set 4 or Pro-Set Plus! and is ergonomically designed to comfortably fit the hand. The rugged switch has chrome spring strain relief on both ends of its cable.
Hand Microphone Click for a larger picture. The NCS-E217 is an omni-directional hand mic with an RJ45 connector installed and pinned out for the C250. It comes with a metal hangar and clip for Hook Switch operation. The coil cord is about 3 feet.
DTMF Microphone The NCS-E218 is a DTMF Click for a larger picture. encoder microphone with an illuminated 12 key alphanumeric keypad with a RJ45 connector installed and pinned out for the C250. Features include an audible sidetone confirmation and automatic muting during tone transmission. The unit has a metal hanger and a removable 3 foot coil cord.

Other Accessories
Radio Cables. NCS provides cabling to interface Click for a larger picture. most commercial and amateur radios with the NCS-C250. Cables can be provided for mobile as well as portable radios. The cables come in a standard length of 6 feet, however custom lengths are available.
Mono-Audio All audio (Selected & Unselected) is routed to both speaker ports. Great for single speaker applications.
Audio & PTT Delay Module The C410 Delay Module provides a user selectable Click for a larger picture. audio delay to accommodate inherent delays seen in trunked systems between receipt of PTT and assignment of channel. Delays of 0, 50, 100, 200, 400, 800 & 1600 msec are selectable.
AC Power Supply The NCS-1516 is a desktop Click for a larger picture. switching power supply with overvoltage and current limit protection. It's input is 120 VAC and its output is 12VDC at a maximum of 3 Amps.
Speakers The NCS-7210 is an 8 Ohm, 3 Watt speaker Click for a larger picture. for use with the C250. It comes with a 3 foot cord. Two speakers are recommended for Selected and Unselected audio. An adapter (NCS-250-SPKR) is available to connect two speakers to the NCS-C250.
C250 Accessories

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