SDRUM 101 Software Defined Radio Receiver User Guide

SDRUM 101 Software Defined Radio Receiver

Product Information

The SDR 101 Software Defined Radio Receiver is a portable device that allows users to receive and demodulate radio signals. With a compact size of 160 x 86 x 22mm and a weight of about 310g, it is designed for easy portability.

Specifications

• Use time: about 10-12 hours (depending on volume and brightness settings)
• Channel saving : 99 channels can be preset
• Body size : 160 x 86 x 22mm (L x W x H)
• Body weight : about 310g (host only)
• RF preamp gain : fixed 20dB
• Circuit Type : Zero IF ZIF
• Sideband suppression: 55dB

Product Usage Instructions

1. Power On/Off
   To power on the SDR 101, press and hold the power button until the device turns on. To power off, press and hold the power button again.

2. Volume and Brightness Settings
   You can adjust the volume and brightness settings of the device according to your preference. Use the dedicated buttons or settings menu to make adjustments.

3. Channel Presets
   The SDR 101 allows you to preset up to 99 channels. To preset a channel, tune to the desired radio station, enter the station name, frequency, and demodulation mode, then save it as a preset.

4. Antenna Connection
   Connect the included BNC rod antenna to the antenna interface of the device. For better listening experience on medium wave radio, it is recommended to connect a dedicated medium wave loop antenna.

5. Earphone Usage
   If you want to listen using earphones, make sure to adjust the volume setting of the earphone (EAR) before using them to avoid discomfort caused by excessive volume.

Frequently Asked Questions (FAQ)

• Q: What should I do if I experience mirror radio phenomenon?
  A: The SDR architecture of the device may cause mirror radio phenomenon if there is a strong broadcasting station nearby. To mitigate this, try adjusting the positioning of the device or use it in a different location.

• Q: Can I use any type of antenna with the SDR 101?
  A: The input impedance of the antenna interface is 50. It is recommended to use a dedicated medium wave loop antenna for better listening effect on medium wave radio.

SDR 101 Software Defined Radio Receiver

Product description

• SDR-101 is a DSP digital demodulation radio based on SDR software-defined radio architecture. It has a 192kHz width spectrogram and waterfall display capabilities, and cooperates with 16bit sampling to realize a high dynamic receiver with CW, AM, SSB, FM demodulation functions. The whole machine adopts an all-aluminum alloy CNC shell, with a 4.3-inch 800×480 resolution high-brightness IPS LCD display, while maintaining acompact and compact body.
• Immediately take it to the outdoors, enjoy the natural scenery and the fun of listening anytime, anywhere!

Basic parameters

• Display technology: 4.3-inch IPS 800×480 resolution DC dimming bright LCD
• Control method : resistive touch screen + rotary encoder
• Frequency range : 100k – 149MHz
• Working mode : CW, AM, SSB single sideband (LSB/USB), WFM, FM broadcast stereo (requires earphones)
• Stepfrequency: 1Hz/10Hz/100Hz/1kHz/10kHz/100kHz/1MHz/10MHz
• Spectral bandwidth : 192kHz, 128kHz, 64kHz, FFT real-time spectrum display
• Antenna interface : BNC male, impedance 50Ω, maximum input power -20dBm
• Reference crystal : TCXO 26MHz ±0.5ppm
• Audio interface: support ordinary 3.5mm earphone or CTIA (American Standard) interface earphone
• Speaker power: maximum 3W, 4Ω multimedia speaker
• Charging port: USB Type-C, 5.0V/2A
• Current consumption: about 250mA @ 5V
• Battery capacity: 5000mAh/3.7V, 18.5Wh
• Use time : about 10-12 hours, depending on the volume and brightness settings of the machine
• Channel saving : 99 channels can be preset, preset radio station name,station frequency and demodulation mode
• Body size: 160 x 86 x 22mm (L x W x H) (without protrusions)
• Body weight: about 310g (host only)

Receiver parameters

• RF preamp gain : fixed 20dB
• Circuit Type: Zero IF ZIF
• Sideband suppression : ≥ 55dB
• Test conditions : 50 ohm input impedance, preamp 20dB on, AGC on

Display control item list
Twelve items that can be selected by the encoder

1. Channel selection : 1-99
2. Frequency setting : 100k – 149MHz, minimum step 1Hz
3. Speaker volume( SPK) : 0~35dB, 1dB step
4. Earphone volume( EAR) : 0~35dB, 1dB step
5. Modulation : CW, LSB, USB, AM, WFM, STE(FM stereo), I/Q
6. AGC setting : OFF, SLOW, MID, FAST
7. Reference level (REF) : -99~99dB, 1dB step
8. Backlight brightness( LCD) : 1%~99%
9. IF GAIN : -12~67dB, 1dB step
10. Spectrum style settings : Green fill, Green line, Blue fill, White line
11. Spectrum bandwidth settings : RF spectrum (192kHz, 128kHz, 64kHz) and Audio spectrum (64kHz)
12. Waterfall area settings ：Waterfall or Waveform (x1 / x8 / x64 amplitude)

Five items not selectable by the encoder

• battery level display
• date and time settings
• radio information display: preset radio name capability
• display of current spectrum bandwidth
• (POWER) input power display

Receiver Block Diagram

The clock generator Si5351 generates two quadrature square wave signals with variable frequency as excitation, and realizes an ultra-low noise ZIF zero-IF receiver. The IQ signal obtained after mixing is output to the CODEC and collected by the MCU, and the DSP algorithm in the MCU completes the demodulation and display of the signal.

Tayloe mixer references
Ultra Low Noise, High Performance, Zero IF Quadrature Product Detector and Preamplifier

State of charge and discharge

Attention points

1. The machine adopts SDR architecture. If there is a strong broadcasting station nearyou, the phenomenon of mirror radio may appear.
2. The input impedance of the antenna interface is 50Ω. For the medium wave radio, it is recommended to connect a dedicated medium wave loop antenna for better listening effect.
3. Please pay attention to the volume setting of the earphone (EAR) before using the earphone to listen to avoid discomfort caused by excessive volume.

Supported frequency bands and coverage

Shipping list

1. SDR101 4.3-inch screen unit x1
2. USB-A to USB Type-C cable x1
3. BNC rod antenna x1 (expanded length 70CM, closed length 14CM)
4. Quick Start Guide x1
5. 4.3 inch screen protector film 1
6. Foldable machine stand x1
7. Resistive screen touch pen x1

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