
AirSpy One ExtIO for HDSDR
see http://hdsdr.de/
see http://airspy.com/


* Input Samplerate from device to HDSDR can be changed using HDSDR's "Bandwidth [F6]" menu.
This can be switched between 2.5 and 10.0 MSPS.
10 MSPS requires a very fast PC and especially USB transfer. You might need to slow down to 2.5 MSPS in case of overload and stuttering!
In SDR# (see http://sdrsharp.com/ ) this option is called "Device sample rate".


* Bias T of +4.5V @ 50 mA  is controlled with HDSDR's IF slider
- IF+0: Bias T is always off
- IF+0 (highlighted): Bias T is always on


* LNA/Mixer/VGA gain is controlled in combination with HDSDR's "RF" slider
The value on the RF slider shows some value, which is a hint. For sure, it will not be exact!
You see positive values (>0; e.g. RF+4) when dynamic range (blocking range) of AirSpy is limited.
"RF+0" corresponds to LNA 14, Mixer Gain 12 and VGA 5 in SDR#.
Range for the RF slider is -58 .. +34 dB: a range of 92 dB.


* Automatic Gain Control (AGC) for LNA and Mixer is NOT controlled,
because you would always need to adjust (at least) VGA!


This ExtIO is developed using
- libairspy https://github.com/airspy/host
- libusb http://sourceforge.net/projects/libusb/files/libusb-1.0/libusb-1.0.19/libusb-1.0.19.7z/download
- pthreads
and Visual Studio (C++) Express 2013 for Windows Desktop


Send your requests/comments to LightCoder <lc@hdsdr.de>

