La télégraphie HF en QRP
                                                                            
                    par F6IRT

                                             
     

   Généralités

   Le Tentec 1320

  
L' Elecraft KX1

  
Le SDR Genesis G40

  
L'apprentissage CW

  
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GENESIS G40: 40m All-mode 5W SDR Radio Transceiver KIT

(SDR means software defined radio)

PS : Publicité gratuite

Spécifications :

- Frequency range: 7000-7095kHz utilizing sound card with 96 KHz sampling rate. A sound card with sampling rate of 192 kHz would extend the frequency range to 6953 - 7140 KHz.Further, the frequency range can be extended to 5 - 7.7MHz with external LO.

-Receiver sensitivity for S/N=10dB and bandwidth 500Hz is between -118 to -120dBm without RF preamplifier or from -128 to -133 dBm with RF preamplifier. The receiver sensitivity of Genesis G40 is sound card dependent - a high quality sound card is strongly recommended!

- Receiver input IP3in is >30dBm

- SFDR: Spurious free dynamic range without intermodulation is between 94 to 98 dB with two signals separate from 5 to 20KHz.

- Receiver 1dB compression point is +15dBm with turn on attenuator or -2dBm and -27dBm without attenuator and additional RF preamplifier gain position +23 and +46dB .

- Receiver opposite side band /audio image rejection: 45dB minimum with built in hardware and more than 70dB with software correction

- Transmitting mode: SSB/CW/FM/DIGITAL or any other modulation generated mode with quadarture I/Q modulation signals, determined by software.

- RF output power: 5W

-Local oscillator rejection is min. 60dBc.

- Transmitter opposite side band audio image rejection with built in hardware is minimum 45dB. With software correction it is possible to adjust image rejection to more than 70dB.

- Power supply requirement: +13.8V / 100-250mA on receiving and 1.7A on transmitting.

- Software: Genesis G40 is tested with following freeware transmitting software: PowerSDR SR40, PowerSDR-IQ, M0KGK and Rocky with one or two sound cards.

-Minimum PC configuration required: P4 1GHz with 128Mb RAM and SDR-suitable sound card. List of recommended SDR sound cards.

- Genesis G40 KIT parts are classic through hole components (not SMT). PCB dimensions: 150 x195 mm














 Utilisation avec le logiciel PowerSDR(PS : Publicité gratuite) :

 

 

How does this work, you might ask.  Well, the software defined radio hardware sends a digitized I/Q data stream over a Firewire connection (or USB connection in the case of the FLEX-1500™) to PowerSDR (aka "the software") for processing.  These digitized signals contain all of the spectral information for the bandwidth being sampled - up to 192 KHz, needed by PowerSDR to function as a full featured ham radio receiver.

FlexRadio PowerSDR has the ability to capture this incoming data stream before it gets processed by the software and records it as a specialized sound file.  Using FlexRadio PowerSDR, you can take this specialized sound file and feed it directly into PowerSDR for processing.  From the software's point of view, it does not know the difference if this is a previously recorded I/Q data file or a real-time I/Q data stream from an actual FlexRadio Systems software defined radio.  Therefore you can use all of the software features of PowerSDR as if you had a SDR attached to your computer.



You can actually operate approximately 95% of the radio's functions as if you were using an actual software defined radio. 
  • Change the frequency and tune signals within the sampling rate bandwidth using the innovative ClickTune™ capabilities available in the interactive Panadapter.
  • Select different modes and demodulate SSB, AM, FM digital and CW signals. 
  • Dynamically manipulate the receive filters, use the noise blanker and digital noise reduction. 
  • Use the 10-band receive EQ and the MultiRX™ capabilities to demodulate two different signals in the same passband