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Digital Tone Remote


The Model 280 Digital Tone Remote represents the new standard in tone remotes. It contains all the unique features and audio performance required to handle critical communications in the public safety and utility market segments. The Model 280 is designed to provide the highest quality audio and most dependable operation to fully support the rigorous demands of  emergency, multi-operator applications.

The Model 280 is programmable to customize the needs of any dispatch center. It is EIA-compatible and will interface seamlessly to the most popular brands of base stations and repeaters such as those from Motorola, Ericsson, and E.F. Johnson. It supports both two-wire simplex and four-wire duplex operation.


The Model 280 Digital Tone Remote always displays the current status of the base station. This can be crucial for public safety dispatchers who need to know the exact configuration of the base station without guesswork. Most tone remotes only display the last command sent by that particular remote. This creates confusion in multi-operator applications where several remotes control the same base station. With the Model 280, however, each remote is updated when  any remote in the system sends a command to the base station. A Model 280 will show the latest base station frequency as well as other parameters such as intercom and privacy.


Digital voice processing is a major innovation in the performance of tone remote controllers. It not only provides the cleanest and sharpest audio, but also makes the remote easier to use. An operator can begin speaking immediately upon pressing the transmit button. With other remotes, it�s necessary to wait first for the function tones to be sent; otherwise, the initial syllables are TM clipped. The InstanTalk circuit is an innovative, momentary digital delay that supports critical communications by always allowing the dispatcher to speak instantly.
The capability to speak immediately makes the Model 280 ideal for dispatchers who are accustomed to using DC remotes but who need to make the transition to tone remotes.

Intelligent, Automatic Audio Leveling
Most remote-controlled radio systems require control from multiple points. The various audio levels are thus often quite different, depending upon their point of origin. Mobile radios, parallel remotes, and distant remotes may all sound different. The Model 280 addresses these issues through the use of high-quality, digital audio processing similar to that used in CD players. Even if a given audio level fluctuates on a daily basis, the Model 280 detects the change and compensates for it.

Reliable Audio Quality
Other tone remotes use analog filters and tone generators that require precise adjustment and ongoing maintenance. The designs degrade with time and temperature, eventually becoming unreliable and offering poor audio quality. The Model 280, on the other hand, is crystal-controlled for stable operation over the specified temperature range. The audio quality does not suffer with age. The Model 280 even performs a self-test during power-up to verify proper operation.

Paging Encoder Option
The Model 280 may optionally be equipped with a versatile, built-in, paging encoder. This provides an easy method of selecting specific field radios and pagers for receiving alerts and voice pages.
One of the most unique features of the encoder is a page-by-name database. As soon as a pager code is entered, the name of the person assigned to that pager appears on the display to verify the selection. If the operator doesn�t know the pager code to begin with, he or she can quickly scroll through the whole list of names on the display until the right choice is found. The encoder is ergonomic and easy-to-use even during
emergency situations.
To further support emergency applications, up to 10 fixed stacks may be pre-programmed. Like a telephone speed-dial number, a stack is a long paging sequence (up to 10 entire pager codes) that can be initiated with a minimum of keystrokes.
The encoder provides Motorola and GE two-tone sequential (100- and 1000-call), 5-tone, pulsed tone, and DTMF (all 16 tone pairs) signaling. Since it is built-in to the remote, it saves desk space and eliminates extra wiring in the dispatch area.

Operator Interface
An operator has two ways to transmit. If desired, the operator can simply press TRANSMIT and begin speaking. A built-in electric microphone picks up the speech and automatic level-control maintains proper gain. A built-in speaker allows the operator to listen to the receive audio. For more private conversations, the operator can use the handset, which defeats the main speaker and built-in microphone. A press-bar on the handset initiates TRANSMIT with a minimum of effort. A connection is also provided for an external desk microphone or headset/footswitch.


  • Controls up to 8 frequencies (F1-F8)
  • Parallel-status feature shows the current status of the base station, even in multi-remote applications. Includes LOTL
  • InstanTalk circuit allows operator to speak immediately, even while the function tones are being sent. Parallel function tones are muted
  • Text aliases may be programmed into the liquid-crystal display to label frequencies and for page-by-name dispatching
  • Programmable via PC to assign key functions, text strings, tone frequencies and durations
  • VU meter and 12/24-hour clock
  • Automatic audio leveling, 600/6000-ohm transformer-coupled 2- or 4-wire interface
  • Four-wire interface for full-duplex operation


  • Paging encoder built-in for Motorola and GE two-tone sequential (100- and 1000-call), 5-tone, pulsed tone, DTMF, and alert tones
  • 120 VAC wall transformer power supply
  • Programming cable, adapter, and PC software




Power 11 - 16 VDC ~ 750 mA
Temperature 0 to 65 degrees Celsius
Size 19" W x 6.25" D x 1.4" H
Weight 2.0 pounds


Line type End-to-end (B1) telephone line
Connector RJ11-C modular jack
FCC Registration EYB USA-74165-OT-E
Incoming call Ring detection on tip-ring pair
Call answer Off-hook, tip-ring current draw
Call disconnect Channel busy, remote hang up, or call limit timer expiration


Line type DID immediate dial or wink start
Connector RJ11-C modular jack
FCC Registration EYB USA-74165-OT-E
Incoming call Loop start
Number of feed digits 2, 3 or 4, pulse or DTMF
DID Battery Supply 48V DC, current limited at 60 mA
Unsupervised: Tip + Ring -
Supervised: Tip - Ring +
Disconnect Loss of loop current > 350 mS


PTT Relay with normally open and normally closed contacts
RX Carrier detect Internal RX noise detector
TX Audio -40 to +6 dBm. Hi/Lo range selection 1K Ohm output impedance
RX Audio -40 to +10 dBm. Hi/Lo and selection, 50K Ohm input impedance, for connection to RX discriminator audio


Indicators Power, Ring, Off-Hook, Carrier, Transmit, DTMF, Signaling
Station ID Morse code, fixed 1200 Hz frequency, programmable ID sequence (not available in the DID version)
User prompt tones Call progress tones, error tones, and warning tones to signal user errors and link failure
Secondary protection Telephone line input is protected with high voltage clamps with protective fusing elements
WISCO International, Inc. - MIAMI, FL U.S.A.
Fax: (954) 370-3997 | E-mail: wiscointl@wiscointl.com

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