Problem Statement: [[Problem Statement]] Questionaire: [[Questionare]]
| S.No | Parameters | Specifications |
|---|---|---|
| 1 | Form factor | Headphone/Earphone |
| 2 | Frequency Range | VLF to Ka band : 15khz - 40Ghz |
| 3 | Modulation Recognition | Automatic ,AI Assisted |
| 4 | Power | <1Watts |
| 5 | Inbuilt Google Transalate | Yes |
| 6 | Inbuilt RF fingerprinting for Channel Seperation | Yes |
| 7 | Battery life | About 3 hours |
- There can be like two stage development cycle
- First is where we have our SDR written from scratch
- Second is RTL-SDR with other capabilties added to the PCB
Battery Voltage: 3.7V Battery Capacity: 1000mAh = 1000mAh Efficiency : 80% Battery Life (FULL USE): Discharging Time = Battery Capacity x Battery Volt / Device Watt. 1Ah x 3.7V * efficiency / 1W(usage-max) = 2.9Hr
Switched through SPDT Switch
20khz - 20mhz -> Ferrite Rod Anteena 10mhz - 100mhz -> ? 100mhz - 1 Ghz-> Wire based dipole anteena 100mhz - 1Ghz -> chip anteena 2ghz - 10ghz -> Chip anteena Wifi -> Chip Anteena
RTL SDR -> Taken from Datasheets Linux Subsystem -> Wifi Module -> ESP8266
Since R820T Doesnt have HF Specs we need to use a Hardware mod that directly connects the amplified signal to HF band. (mentioned in URL), We have devised a 9db common base amplifier to amplify the HF band to feed to rtlsdr
We have designed seperate schematic board for 20khz - 20mhz and 1ghz - 10ghz bands This allows us to either create specific board or hats if required or incorporaste into the final board , away from the main control systems.
0.6Ghz - 3.1 Ghz : SR4L054 3Ghz - 10Ghz : 3100AT51A7200001E
RF Amp and switcher: ADL8112 Attentuator: TGL4203-SM RF Preamp: HMC788ALP2E VLF Active anteena : An Active Ferrite Rod Antenna with Remote Tuning 10Ghz LP: LFCW-8700+ 48 Mhz BPF: BPF-B48+ 75 Mhz BPF: BPF-B76+
- Frequency range: 25 to 1766 MHz
- Noise figure : 3.5 dB @ RF_IN
- Phase noise: -98 dBc/Hz @ 10 kHz
- Current consumption: ＜178 mA @ 3.3V power supply
- Max input power: +10 dBm
- Image rejection: 65 dBc
- Differential input impedance of the RTL 283 chip is approximately 3,300 Ohms
Oscillator : MAX2871 Layer stackup should be 4 layer with: RF DC, GND, RF DC, GND Using Si5351A for XREF generation
RTL SDR HF Hardware MOD: https://www.rtl-sdr.com/an-interesting-rtl-sdr-direct-sampling-modification/ RTL SDR HF Hardware MOD implemented: https://www.g8jnj.net/softwaredefinedradio.htm Using RTL SDR over stm32 microcontroller: https://fallingnate.svbtle.com/rtl2832-usb-stm32-pt1 Linux capable SOC: https://jaycarlson.net/embedded-linux/ RTL SDR base design: https://www.rtl-sdr.com/forum/viewtopic.php?f=1&t=265#p824 Generalised Block Diagram: https://aaronscher.com/wireless_com_SDR/rtl_sdr_info.html Ferrite rod calculator: https://coil32.net/online-calculators/ferrite-rod-calculator.html LPA and sa602 reference design: https://web.archive.org/web/20161031125636/http://home.scarlet.be:80/on1bes/sdr_up_converter3.0_r820t.html Good RF Downconverter: https://github.com/raziele/Nigun , https://www.rtl-sdr.com/nigun-open-hardware-plans-for-an-rtl-sdr-downconverter/ 1.5 to 6ghz Downconverter: https://github.com/electrosense/hardware/tree/master/electrosense-converter-firmware , https://www.rtl-sdr.com/electrosense-rtl-sdr-based-crowd-sourced-spectrum-monitoring-with-a-dc-to-6-ghz-rtl-sdr-up-downconverter/ 50mhz to 12Ghz PLL VCO: https://www.digikey.in/en/products/detail/analog-devices-inc/ADF5610BCCZ/10249599 Devkit VCO above: https://www.analog.com/en/products/adf5610.html#product-evaluationkit XREF Generator using Si5351A: https://learn.adafruit.com/adafruit-si5351-clock-generator-breakout/downloads Wideband Anteena: https://www.digikey.com/en/products/detail/johanson-technology-inc/3100AT51A7200E/1840080 [3.1-10.3 Ghz] Wideband Anteena Low Freq: https://www.digikey.in/short/z9rwv9qc [0.6 - 3.1 Ghz]
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