VRC-411/E system is a direct sequence spread spectrum radio designed and manufactured for establishing communication in the UHF1 frequency band. Due to the method used in this radio i.e. expanding the frequency spectrum in a wider bandwidth and decreasing power level of transmitter and as a result hiding radio signal under the noise level, the signal is prevented from being monitored by enemy for eavesdropping and jamming.
A keypad includes handset is designed for the radio to set the system parameters and establishing voice communication. In addition, parameters of the system can be set via the GUI software.
One important capability of the VRC-411/E radio is to network 6 systems as the TDMA for data transmission. In this network, one system is Master and other 5 systems are Slaves, whereas voice is transmitted normally in broadcast mode
| General Specifications | |
|---|---|
| Frequency range | 225~400 MHz |
| Signal bandwidth | 10 MHz |
| Data transmission rate | 4800, 9600, 19200 bps |
| Maximum ratio of wideband jamming to the signal | 17 dB in minimum S/N |
| Process rate in data transmission rate of 19200 | 24 dB |
| Process rate in data transmission rate of 9600 | 27 dB |
| Process rate in data transmission rate of 4800 | 30 dB |
| Expander code type | Long |
| Synchronization code type | Long |
| Transmission delay | <500 msec |
| Communication type | Simplex, Half-duplex |
| Supply | 24V |
| Output port | RS-232 |
| Modulation type | QPSK |
| Channel Accessibility | DSSS |
| Transmitter Specifications | |
|---|---|
| Output power maximum | 20W (adjustable in three levels) |
| Harmonic rejection | Better than 50 dBc |
| Receiver Specifications | |
|---|---|
| Receiving sensitivity (BER=10E-5) | -108 dBm |
| Maximum receivable signal level | -15 dBm |
| Noise figure | 8 dB |
| Image rejection | Better than 50 dBc |
| IF rejection | Better than 50 dBc |
| Physical & Environmental Specifications | |
|---|---|
| Maximum speed | 60 km/h |
| Operating temperature | -33°C ~ +65°C |
| Vibration standard | MIL-STD-810F |
| Dimension | 100×315×290 mm |
| Weight | About 10 kg |
| Case material | Aluminium |
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