sBitx SDR Transceiver is now available for order from target=”_blank” href=”https://hfsignals.com/” target=”_blank” rel=”noreferrer noopener”>hfsignals.com. sBitx SDR Transceiver comes down from the long line of the world’s most popular Bitx transceivers.
The sBitx is a 40 watts, fully open source, high performance HF SDR transceiver with in-built popular modes like the FT8, RTTY, PSK31, etc. HF Signals is now selling the Developers Edition for the homebrewers and the hackers who are comfortable with frequent updates and experimental branches of the software
Performance from Simplicity
Performance doesn’t have to come with expensive components. A careful application of design principles over inexpensive and readily available parts and modules like the Raspberry Pi and ordinary transistors like the 2N2222s, results in a simple radio that is powerful and yet easily understood. Easy to understand, simple circuit that allows you to modify, enhance or experiment. None of the components cost more than a few dollars. Read the detailed target=”_blank” href=”https://www.vu2ese.com/index.php/2022/07/20/the-sbitx-the-sdr-for-the-homebrewer/” target=”_blank” rel=”noreferrer noopener”>sBitx design paper, download the target=”_blank” href=”https://github.com/afarhan/sbitx” target=”_blank” rel=”noreferrer noopener”>Circuits and the Software.
Hackable
- Entire development system is on the radio and preconfigured. Start editing the code and run build to see the changes. No need for any external computer to hack this radio.
- Written in plain C language. If you can read Arduino code, you can code the sbitx too!
- Simple User Interface encourages you to change the layout, create you own look and feel with your own buttons, screen layouts and macros.
- Intuitive approach to SDR
- Understand and learn to do DSP, SDRs. The sBitx’s approach uses a conventional superhet architecture along with convolution SDR to build the simplest SDR architecture.
The Receiver
The receiver is a hybrid architecture that filters exactly 25 KHz of RF spectrum using an aggressive crystal filter, eliminating the image problems associated with phasing type of SDRs.
- Passive FET mixer without early amplification with +28 dBm IIP3
- 6 pole, 25 KHz bandwidth crystal filter front-end suppresses opposite sideband by 70 db.
- High dynamic range IF system to preserve all closed spaced signals of digital modes.
- General Coverage HF reception
- Ring free Pass Band Tuning for working CW and SSB without fatigue
- Audio Recording of brag tapes
- Automatic decoding of in-built modes like FT8, RTTY, PSK31
- AGC settings of Fast, Medium and Slow
- Band stacking VFOs, 4 frequency/modes on each band
Transmitter
The transmitter is a powerful 40 watts output radio for when the going gets tough
- The PA uses IRFZ24N transistors that can are easily replaced even if you blow them up
- 40 watts on 80m and 40m, goes down to 20 watts on 15m and 6 watts on 10m
- 3 section low pass filters for clean transmit output.
- Two VFOs with split function, incremental tuning.
- Speech compression for SSB
- Better than 43 dbc suppression of spurious emissions
Brief Specifications
| Frequency | Receive; 100 KHz to 30 MHz, Transmit: 3500-4000, 7000-7300,10000-10150, 14000-14350, 18000-18200, 21000-21450, 24800-25000, 28000-29700 (KHz) |
| Power Output | 40 watts on 80M and 40M, 30 watts on 30M and 20M, 20 watts on 17M and 15M, 10 watts on 12M, 6 watts on 10M |
| Power Consumption | Receive: 1.5 A Transmit : 10 A |
| VFOs | Two VFOs A and B, with split operation, tunable in steps of 100 KHz, 10 KHz, 1 KHz, 100Hz and 10 Hz. Direct frequency entry from the keyboardRIT : Receiver incremental tuning +/- 25 KHz Split operation: Cross band |
| Band stacking | 4 frequencies/modes on each band, selectable by repeatedly pressing the band switch. |
| Modes | USB, LSB, CW, CW-Reverse, RTTY(45), PSK31, FT8 (with on-display decoding and sending) 2-Tone test signal for intermodulation testing and PEP measurements. |
| Logging | Built-in logger with N1MM format macros, Auto incremental Exchange number of contesting. |
| Recording | Record your QSOs int WAV format files |
| Third party apps | Fldigi: FLdigi intergrated via xml-rpc. QRZ.com: Queries your contact’s callsign on qrz.com |
| Receiver | Noise Figure: +15 dB, IIP3 : +28 dBm |
| Transmitter | Upto 40 watts of variable output power Better than -43 dBc suppression of spurious signals Speech compression on SSB |
| Telnet | Connects to RBN and DX clusters from the radio |
Buying Options: target=”_blank” href=”https://www.hfsignals.com/index.php/sbitx/#buyfullsbitx” target=”_blank” rel=”noreferrer noopener”>Fully Assembled $499 | target=”_blank” href=”https://www.hfsignals.com/index.php/sbitx/#buybasicsbitx” target=”_blank” rel=”noreferrer noopener”>Board Set $270
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