SEC-35 is a secure multi-service terminal which connects to a HF radio to realize secure HF communication. SEC-35 has different versions such as portable, vehicular, airborne and shipborne one for various applications. The basic functions and specifications of the different versions of SEC-35 series are the same.  

Features

l        Service support: voice, fax, data, still image

l        Encryption key is automatically distributed by wireless channel.

l        Automatically detecting voice, data, fax and still image.

l        Provides connectivity between mobile station and PABX or PSTN

l        Remote control by computer

l        Tamper-proof design, automatically erase encryption key in emergency.

l       Self-test and fault indication down to module level.

l       Provides voice recording interface for recording voice communication.

Specifications

l        Communication mode: full duplex/half-duplex

l        HF modem

Data transfer rate: 2400, 1200, 600, 300, 150, 75 bps

Doppler frequency deviation: initial value±75 Hz, Tracking rate:±3.5 Hz/s

Error control: FEC (including convolution and TCM coding) and ARQ.

Channel bandwidth: 300~3000 Hz

l        Vocoder

Data Rate: 2400, 1200 bps

Voice quality:

a. Zero code error

When data rate is 2400bps, the intelligibility of single word >90%, and the listener can identify the speaker.

When data rate is 1200bps, the intelligibility of single word >86%.

b. Bit Error Rate is 1×10^-2

The intelligibility is good enough to conduct a conversation.

l       Encryption: Proprietary algorithm.

l       Synchronization

Synchronization: one time synchronization

Synchronization probability: >99%(When BER<1×10^-2, indoor)

Synchronization time: when working in duplex mode<5s

when working in half-duplex mode<1.2s

l        Interface

Data：RS-232C, RS-422

Remote control：RS-232C, RS-422

Audio: input level -16~6dBm,  input impedance 600Ω±15% balanced

      output level -25~10dBm, input impedance 600Ω±15% balanced

l        Power supply：

The unit can be supplied with either AC or DC power.

AC power: AC (50Hz±5%)，Power consumption≤40VA(220V)

DC power: DC 24V±20%，floating ground，Power consumption≤20VA(24V)

l        Repair

MTTR≤30min（by ship staff）

l        Reliability

MTBF≥2000h