Difference between revisions of "CYCLOPS"

Revision as of 03:19, 5 December 2007

Cyclops - 0 to 1GHz Spectrum Analyzer and Tracking Generator

Largely based on Scotty's Spectrum Analyser [SSA] http://www.cpu-net.com/host/wsprowls/ but with a 50MHz second IF based around Mercury or QuickSilver. Moving the second IF to 50MHz simplifies the filtering after the first mixer which means we can most likely use a SAW or Ceramic filter here rather than the multi-stage cavity filter used in the SSA.

Please note that the project is intended to develop a spectrum analyser and not a broadband receiver - we will be grabbing a number of samples from the ADC and then processing them at our (PC's) leisure rather than doing this in real-time.

Ideas, comments and suggestions are welcome.

73's Phil...VK6APH

Update: 4 December 2007 Bill and I have successfully written the necessary software, based on MercScope by Phil N8VB, to display a 48-51MHz chunk of spectrum from Mercury. This represents a working proof of concept as far as the IF is concerned.

Considerable feedback has indicated that basing the software design on C# and Windows based tools was not particularly popular. There was strong support for a cross platform approach. In which case further development will be undertaken using Java for the GUI (including OpenGL), C/C++ for the processing logic and dttSP for the signal processing. Tom,N4WBS, has agreed to be lead programmer and I am delighted to welcome him to the project.

I have also looked at using a higher 2nd IF, 96MHz rather than 50MHz. This will further relax the specification of the GHz first IF filter and the availability of high performance SAW filters at this frequency will provide sufficient 2nd IF image rejection. The performance of Mercury at this frequency (an alias response) is totally acceptable.

This is a screen shot of the Cyclops PC software processing a simulated input. Frequency span is 0 - 55MHz. A sort of Spectrum Analyzer "Hello World!".

Feedback

Al - N0TVJ - Good web site by S53MV with lots of relevant ideas http://lea.hamradio.si/~s53mv/spectana/vco.html

Difference between revisions of "CYCLOPS"

Revision as of 03:19, 5 December 2007

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 Largely based on  Scotty's Spectrum Analyser [SSA] http://www.cpu-net.com/host/wsprowls/ but with a 50MHz second IF based around Mercury or QuickSilver. Moving the second IF to 50MHz simplifies the filtering after the first mixer which means we can most likely use a SAW or Ceramic filter here rather than the multi-stage cavity filter used in the SSA.
-For the PC software Phil, N8VB, has generously provided us access to his SharpDSP dll and MercScope code.  This gives us a very good start since we will be starting from a working code base.
-Phil's code is written in C# and can be built using the free Microsoft Visual Studio 2005 IDE.  Since Phil's code was designed to work with a very limited set of hardware it is very straightforward and I think quite suitable for a beginner to work on. I intend that we develop our own custom PC code for Cyclops and not attempt to modify PowerSDR.
 Please note that the project is intended to develop a spectrum analyser and not a broadband receiver - we will be grabbing a number of samples from the ADC and then processing them at our (PC's) leisure rather than doing this in real-time.
-So far, with lots of patient support from Bill, KD5TFD, I've been able to modify Phil's code to display a simulated 0 - 55MHz output from the LT2208 ADC on Mercury.  By simulating an input those interested can work on  the code without the need for any hardware for the time being.
-If there are any budding programmers in the group that would like to assist with the code then there is one area I'd appreciate some assistance with.
-I'd like to use DirectX (Direct3D) to display the spectrum rather than GDI that Phil used (even though there appears to be a substantial graphics speed improvement  using .NET2 compared with .NET1). This will take a substantial load off the PC CPU and transfer it to the Graphics Processor.
 Ideas, comments and suggestions are welcome.
 's Phil...VK6APH
+Update:  4 December 2007
+Bill and I have successfully written the necessary software, based on MercScope by Phil N8VB,  to  display a 48-51MHz chunk of spectrum from Mercury.  This represents a working proof of concept as far as the IF is concerned.
+Considerable feedback has indicated that basing the software design on C# and Windows based tools was not particularly popular.
+There was strong support for a cross platform approach.  In which case further development will  be undertaken using  Java for the GUI (including OpenGL), C/C++ for the processing logic and dttSP for the signal processing.  Tom,N4WBS, has agreed to be lead programmer  and I am delighted to welcome him to the project.
+I have also looked at using a higher 2nd IF, 96MHz rather than 50MHz. This will further relax the specification of the GHz first IF filter and the availability of high performance SAW filters at this frequency will provide sufficient 2nd IF image rejection. The performance of Mercury at this frequency (an alias response) is totally acceptable.
 This is a screen shot of the Cyclops PC software processing a simulated input. Frequency span is 0 - 55MHz. A sort of Spectrum Analyzer "Hello World!".