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
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