Cheap SDR transceiver T41 na 5 band

T41-EP (aka T41) is a robust 20W SSB and CW SDR transceiver, which Jack Purdum W8TEE and Al Peter AC8GY worked on for three years. It is an open source project and the radio is designed as a platform for experimenters. Frequently used settings are quickly changed using the switch matrix on the front panel. they are located with me in the Great Pake JN88QA, less frequently changed settings, are adjusted using a simple menu system. The settings are “set it and forget it”, because they are stored in the EEPROM memory. Software and hardware solutions can be easily changed, so experimenters can adapt the device to individual needs. Jack and Al did everything for it, to make radio a flexible platform for realizing ideas and more fun, the pleasures of the hobby.

The radio is built into the modules, not as one board. Various functions can be changed without it, to have a significant impact on other modules and their processing. Microcontrol Teensy 4.1 is the heart of the T41 and has 7,9 MB of flash memory for program storage and 1 MB of the date. The microcontroller performs all the functions of the SDR T41; no computer required, ani tablet. The T41 has enough power for that, to handle difficult tasks, which a high performance SDR radio requires, thanks in part to its 600MHz clock compared to the Arduino Nano's 16MHz clock. Then don't forget, that despite all the features, which are included in T41, you still have more than 7,6 MB of memory, with which you can experiment, if you want!

Big (1206) SMD components are already installed on the boards, making this kit easy to assemble. The majority of the structure consists of the assembly of the control elements and their connection to the T41 boards, as shown in the figure:

SDR transceiver T41 block connection
SDR transceiver T41 block connection

The T41 has an advertised low price considering all the features, which are built into it. It is a robust SDR transmitter, which costs a fraction of the price of other SDR transmitters with fewer features. We think, that you will be impressed by the price/performance ratio of the T41! It will be great, fully functional and educational kit for the new constructor, new HAM or seasoned veterans, who just want to have fun with a new device or have a cost-effective platform for experimentation.

Specifications and design features of SDR transceiver-a T41


T41 SDR transceiver in a different design
T41 SDR transceiver in a different design

T41-EP feature set

–Five-band (80-40-20-15-10M) high frequency transmitter
–SSB/CW with user adjustable power from 1 do 20 W
–Microcontrol Teensy 4.1 (against T41) with PJRC soundboard
–designed for experimentation (hence EP as Experimenter’s Platform)
–Built-in SD card for reading/writing.
–5″, 7″, 9″ TFT SPI color display (800×480)
–Standalone (no external computer required, ani tablet)
–24-bit ADC/DAC converters
–DSP filters with adjustable bandwidth, flat band passes and rock skirts
–three noise limiters
–Automatic notch filter
–Magnification of the spectrum display (bandwidth from 12 kHz do 192 kHz)
–14-band gain equalizer
–14-band broadcast equalizer
-Microphone compressor
–Adjustable frequency increment (10, 50, 100, 250, 1000, 10000Hz)
–Front, rear or both input connectors (e.g.. headphones, Finally, due to the different potential, a larger amount of HF current flows after the outer braiding of the coaxial cable, PTT, keys)
–Speaker output option
–S meter with dBm measurement
–Two VFOs and Split
–AGC (off, slow, medium, fast)
–Real-time audio display sketch
–Four sensors: 1) Main tuning, 2) Fine tuning, 3) Filter setting/parameter menu setting, 4) Loudness
–Button switch matrix for commonly used functions (menus for less frequently used settings)
–EEPROM memory for user adjustable settings
–Keyer (5 to 60 WPM)
–Keying: classic key or double paddle
–New Alp CW decoder
–spectrum, waterfall and sound display
–Save/recall option 10 “favorites” frequencies (user expandable)
–USB output for easy software update
–Open source hardware and software (Gerbery, parts lists, schematics and source code are available online)
–7 small PCBs to support experimentation –Large SMD (1206) components
–Uses a power source 12 In up to 13,8 V

The preliminary price of the T41 transceiver is 320 USD (it can change). In July 2022 beta versions were sent out, so the sale of finished kits is already expected

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