Expert Electronics SunSDR2 DX

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SunSDR2 DX User Manual

ExpertSDR2 SOFTWARE DESCRIPTION

After tuning the power values, press the Write button.

Frequency coefficient - Correction menu of the transceiver's frequency tuning.

Set the coefficient that the transceiver's tuning frequency would be equal to the real frequency

of the received signal.

Note:

Correction of the displayed frequency could be made according to the time signals on the

4.996MHz, 9.996MHz or 14.996MHz (preferably) frequencies in the IARU region 1 and

5.0MHz, 10.0MHz, 15.0MHz in the IARU region 2, where you can find easily tracked pulse

signals. If they do not match with the tuned frequency, adjust the Frequency coefficient till

the frequency match.

Steps of the procedure:

1. Select the minimal sample rate 39 kHz

2. Set max panorama resolution 16384 Options-Display-Spectrum-FFT size (more detail about

FFT size in Spectrum )

3. Set CW mode

4. Tune on 14.996 kHz in day-time, 9.996 or 4.996 in night-time. The higher the calibration

frequency the better

5. Zoom in panorama to the max level

6. Check, if peak of the signal is away from the red tuning filter, then change the Frequency

coefficient until they match. After each change press the Write button, because these

corrections are stored in the transceiver's firmware

If you have a generator with the known signal, then you can use it. The higher the frequency

the better, until 79 MHz.

The devices are calibrated at the manufacturing by default, additional calibration is not

required.

SDR Firmware - Press the SDR Firmware button to initialize firmware update of the SDR

board.

DITH - Set the DITH checkbox to enable internal noise source of the receiver's high-speed

ADC. After set/unset of the DITH checkbox, press the Write button.

Note:

Internal noise source in the ADC gives an additional linearity to the receiver's ADC

functionality. As a rule used for lab measurements for receiver's linearity with other devices.

While operating in real air, noise source is an actual noise of the air, that's why there is no

need to enable DITH function.

Expert Electronics SunSDR2 DX - Page 65