The DC440 is a powerful yet flexible instrument for decoding sub-audible and digital signaling tones as well as Touch-tone® characters. The DC440 monitors the demodulated audio output from a communications receiver, service monitor, scanner, or Interceptor^tm. The DC440 automatically decodes CTCSS tones and DCS codes. A unique feature of this instrument is that DTMF characters are also simultaneously displayed on the two line alpha numeric LCD.

A serial data jack permits connection to a PC serial port using the OptoLinx interface. The DC440 has a complete set of control codes to permit operation from a PC.

When used with a CI-V compatible communications receiver and PC, automatic monitoring of communications channels for tone and code usage is possible using ScanStar, ScanCat or RCSI software.

The DC440 has six operating modes for maximum flexibility. On power up the default mode permits automatic detection and display of 50 CTCSS tones and 106 DCS codes along with 16 DTMF characters. When connected to the discriminator circuit of a communications receiver and a logical output from the squelch circuit, the DC440 can be used to automatically monitor tone and code usage as well as uncoded transmissions. Other modes include CTCSS/DTMF, DCS/DTMF, DTMF only, and Period measurement for monitoring non-standard tones. A squelch status indicator and decode activity indicator make the DC440 the most flexible and powerful instrument of its kind.

• Simultaneous off the air measurement of 50 CTCSS tones, 106 DCS codes, and 16 DTMF characters
• Six measurement modes for maximum flexibility
• Scrollable ten character display of up to 127 stored DTMF characters guards against data loss
• Convenient front panel controls for Power, Mode, and Recall
• Serial Data Interface, Use with OptoLinx interface to connect to PC serial port - Complete set of control codes for remote operation
• ToneLog^tm Software option for automatic Time/Date Logging of Tone and Code usage
• Unique "On The Air" display when squelch breaks but no code or tone is transmitted
• Decoding Activity Indicator
• Compact Size Ideal for Mobile or Portable operation with optional internal NiCad battery
• Exceptional 2 line by 16 character back-lit LCD Display for optimal direct sunlight & low light viewing
• Precise switched capacitor audio filtering
• Uses ultra reliable OE10 counter IC to measure tones using period averaging technique

• Use with scanner or receiver for off-the-air measurements (may require internal connection to discriminator for CTCSS and DCS)
• Upgrade older communications service monitors
• Use with receiver and PC to automatically survey busy communication channels for tone and code usage
• Ideal for repeater operators to monitor users
• New and powerful test instrument for two way service technicians, hams, monitoring hobbyists, and security/law enforcement professionals
• Direct connection to Optoelectronics R10 Interceptor® (requires Model CB440 Cable) for low cost CTCSS, DTMF, FM deviation & Signal Strength measurement system

Function                  Decodes & Displays 50 CTCSS Tones, 106 DCS Codes
                          and 16 DTMF Characters
Display                   2x16 character LCD dot matrix with EL Backlight
Controls                  Power, Mode, Recall
Inputs
  Audio In                3.5 mm stereo phone jack, 400 K Ohm input impedance
  Data Out                3.5 mm mono phone jack, CI-V protocol
Output                    Serial Data (I/O)
Power Requirement         7-15 VDC
RF signal
Size                      1.8" High x 4.5" Wide x 4" Deep