[hpsdr] Initial Gnuradio module for Hermes/Metis

[Tom McDermott]

An alpha-version of a Gnuradio module for Hermes/Metis is available in the SVN repository.
 
http://svn.tapr.org/repos_sdr_hpsdr/trunk/N5EG
 
You will need to build the gnruradio Hermes module from the source (easy).
 
The build instruction are very similar to building gnuradio, and instructions are in the top trunk/N5EG directory.
 
The gr-hpsdr directory contains the source, SVN->Checkout gr-hpsdr directory and contents to your Linux system.
 
This has been tested with Gnuradio 3.6.2 and Ubuntu 12.04.
 
The initial code provides receive-only operation, one receiver only, can set receive sample rate, receive frequency, and turn the receive preamp on and off. I'm assuming that Metis works the same as Hermes, but can only test Hermes. The host Ethernet interface is hard-coded to "eth0" in this version.
 
In the grc_applications directory, two demo apps show how to interact with the Hermes module.  
The SSB receiver app provides the ability to select upper/lower sideband, turn the preamp on/off, set the receive frequency and the receive sample rate (48000, 96000, or 192000). The AGC works poorly - it's hard to make a good audio-only AGC!  The receiver works fine.
 
The GUI app shows how to connect the QT GUI (spectrum analyzer, time-domain, and constellation-domain) viewers to the app.
 
-- Tom, N5EG
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