Category:
Communication and ItDESCRIPTION
New generation of airborne radios are designed based on the SDR (Software Defined Radio) technology. Benefiting from the technology an appropriate infrastructure is provided for data transmission and establishing data link networks as well as improving technical specifications and stability in comparison with the old radios.
| Main Items | Calculations and Values |
|---|---|
| Input Audio | |
| Local | Unbalanced with 150Ω impedance and -35dBm to +10dBm power with capability of microphone bias |
| Line | Balanced with 600Ω impedance and -15dBm to +10dBm dynamic range |
| Modulation Factor | |
| AM Mode | At least 80% |
| FM Mode | ±5KHz frequency deviation in 25KHz channel spacing ±2.5KHz frequency deviation in 12.5KHz |
| Modulation Distortion | Maximum 5% in environmental test condition; maximum up to 10% |
| Audio Frequency Response | 300 to 3400 Hz |
| Side Tone | |
| AM Mode | Audio sampling from the antenna RF output signal |
| FM and ECCM Modes | Control signal sampling from the antenna RF output signal |
| Harmonic Rejection | Better than -55 dBc |
| Spurious Signals | Better than -80 dBc |
| Output Power Stability | Up to VSWR <2.5 against mismatch |
| Receiving Specifications | |
| AM Sensitivity | -103 dBm for more than 10 dB SINAD in detecting the 1KHz signal modulated with 30% modulation |
| FM Sensitivity | -108 dBm for more than 10 dB SINAD in detecting the 1KHz signal modulated with 2.5KHz deviation |
| ECCM Sensitivity | -90 dBm for maximum 4×10^-2 bit rate error |
| Squelch Sensitivity | Setting the squelch ON/OFF point is accomplished in the range of 5 to 25 dB output SINAD |
| Image Frequency Rejection | -80 dB |
| IF Frequency Rejection | -80 dB |
| Selectivity | |
| WIDEBAND | Spurious signal rejection for ±25KHz frequency offset is at least 60 dB |
| NARROWBAND | Spurious signal rejection for ±12.5KHz frequency offset is at least 40 dB |
| Output Audio Signal | |
| Audio Output | Output of the system can be from the main receiver and/or mix of the main and guard receivers' outputs |
| Loudspeaker’s Output | At least 2W for 6Ω loudspeaker |
| Sound Recorder’s Output | 700 mVrms amplitude on 600Ω load |
| Differential Output | Balanced 700 mVrms amplitude on 600Ω load |
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