AFEDRI SDR-Net description

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Category: Hardware
Published on Wednesday, 28 December 2011 09:53
Written by 4Z5LV
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AFEDRI SDR-Net it is direct sampling Software Defined Receiver (see picture below)  it has ability to send received I/Q stream trough two different interfaces (previous version of AFEDRI SDR supports only USB interface):

- Network (LAN)

- USB

AFEDRI SDR-Net has next parameters:

RX frequencies:

0.1MHz-30MHz (Low Pass filter assembled (LPF) - default assembly configuration)

0.1MHz-70MHz (In aliased mode, LPF is not assembled, external Band Pass Filter (BPF) have to be used instead)

Can be used to monitor  WFM band - 88MHz-108MHz...

Noise Figure: ~14dB (for 1MHz-30Mhz range and maximum gain 35dB)*

*input VGA (Variable Gain Amplifier) is tuned to have variable Gain from -10dB up to +35dB

Output data format: two 16-bit I/Q channels (audio stereo stream emulation)

Maximum Receiving bandwidth:

BW = up to 460kHz (for 500 ksamples/s sample rate) -  using Network connection

BW = up to 230kHz (for 250 ksamples/s sample rate) -  using USB connection

RF ADC sampling rate: 80.000MHz

Power Supply Voltage: 5V (supplied from USB bus) or 12.6V supplied from external power supply or external battery.

Power Supply current:

- 470mA from USB

- 270mA from external 12.6V power supply

 

AFEDRI SDR-Net  - default assembly

 

The AFEDRI SDR-Net is designed to be connected to Personal Computer (PC) by two alternative interfaces:

1. First interface: Ethernet Network connection. That can provide up to 500Khz sample rate (two quadrature channels I/Q with sample rate up to 500kHz samples per second 16-bit each channel)

2. Second interface:  Full Speed USB like in previous AFEDRI SDR versions. It sends  to PC two quadrature channels I/Q with sample rate up to 250k samples per second 16-bit each channel

You can download recorded in Winrad audio files:

- I/Q with 500ksamples/s sample rate - Network

- I/Q with 444ksamples/s sample rate - Network

- I/Q with 250ksamples/s sample rate 14Mhz band - USB

- I/Q with 250ksamples/s sample rate 7Mhz band - USB

From PC side of view, the SDR can be used alternatively as:

1. Network device that is using two IP protocols: TCP and UDP.

- TCP protocol is used to control over SDR parameters.

- UDP protocol is used to send received I/Q stream from SDR to PC

2. Or exactly like previous version AFEDRI SDR - USB Composite Device, that contains two USB functions:

All USB functionality of AFEDRI SDR-Net is same as in previous AFEDRI SDR, the only difference in USB Audio Device realisation - it is using non standard (for audio) sample rates, that is result of integer division of main clock frequency 80.0Mhz.

So I want describe below only new features, that was added  with network interface. For more information about USB functionality please read AFEDRI SDR description. 

When AFEDRI SDR-Net connected to PC using network interface it compatible with next PC SDR software:  Linrad, Winrad, HDSDR, WRPlus, SDR Console (SDR Radio) etc...

There is software plugin - SDR Network Control Box plugin , that can be used with Winrad, HDSDR or WRplus, it allows to control over the AFEDRI SDR parameters (frequency, RF gain/attenuation etc...) and receive UDP I/Q data stream.

SDR Network Control Box software can be used as stand alone application when connected trough USB interface, and/or as plug-in for Winrad/HDSDR software (under Windows) for network and USB connections, so SDR's frequency can be displayed and changed directly from Winrad GUI (please check my Download page).

When working together with Linrad or SDR-Radio software - no additional software or plug-ins is needed - you need only to configure this software in similar way, like for using with SDR-IP receiver ...

AFEDRI SDR-Net can be used together with MAP65-IQ software when working with Linrad or SDR-Radio software.


SDR Ntetwork Control Box screen-shot.

The SDR Control software was written using Qt Cross-platform application framework from Nokia, so both Windows and Linux software versions can be compiled and have similar Graphical User Interface (GUI) under both OS-es.