The NCEU Chassis Specifications:

· AM-FSK Modulation 50-ohm output format is suitable for an Exciter/Modulator
· Outputs SGLS compatible tones at 1KBPS rate and is AM modulated by a 500Hz triangular waveform:
Logic one: 95 KHz, Logic zero = 76 KHz, Logic S = 65 KHz (tone accuracy is +/- 1%)
· AM/FSK output amplitude adjustable from 0.5 to 3.0 volts peak-to-peak
· Adjustable modulation factor from 0.45 to 0.55
· Adjustable bit rate from 990 to 1010 BPS in 1BPS steps
· Two RS-232 ports for input command packets (9600 BAUD)
· Interfaces to Mykotronx KIT-223 Encryptor Unit for 63-Bit commands
· Accepts Encryptor 63-Bit Bypass and Crypto Commands
· Accepts 20, 32, or 48-Bit Clear (non-encrypted) Commands
· Provides 16K bytes of Command Buffering
· Programmable idle tone and minimum idle tones between commands
· Provides 50-ohm outputs of SGLS tones identical in content to the AM/FSK output
· Loopback feature accepts 50-ohm SGLS tone inputs and outputs tone data to a separate RS-232 port (9600 BAUD)

The NCEU Chassis Major Features:

· Digitally synthesized SGLS tones and triangle modulation waveform
· Front panel LCD display provides a configuration menu for the following parameters; Amplitude, Bit-Rate, Modulation Factor, Command Port Selection, Preamble Tone, Preamble Length, Idle Tone, Minimum Idle Duration, LCD Contrast, Audio Loudness, Loopback Mode, Encryptor Initalization
· Configuration parameters are stored in non-volatile memory
· Front panel LCD display also provides operational status
· Utilizes dual Motorola MC68HC11 Microcontrollers
· Software provides built-in-test capability
· 19-inch rack-mountable unit (3.50 inches high)
The NECU Chassis Available Options:
· Loopback verification option permits loopback data to be decryted and the received data pattern to be sent to the Command Port
· SGLS compatible 2KBPS output rate option
· Other options available upon request