I was going to duplicate Paul’s system more a decade or so ago when I ran into Al Ward W5LUA at Dayton, and he indicated that I should advance to the current century and use an SDR-IQ ( or maybe it was an SDR-14, I don’t remember ) taking the IF signal from the 10 GHz transverter along with SpectraVue running in the Continuum mode to do this.
Paul wrote this article before SDR’s had come onto the scene for Amateur Radio use, and so he used a wide-band (several MHz bandwidth) analog system using a 10 GHz transverter, some interdigital filters, and an amplifier feeding an HP 432 power meter. Paul Wade W1GHZ wrote an excellent although now dated article on this subject in the 1990s: The key to getting an accurate measurement is in having sufficient bandwidth of the sampled signal, whether the technique used is an old analog method or a more technologically advanced SDR-based method. I think thats everything but its all very well explained on the three pages listed above, i suggest reading them thoroughly.This is is followup to our discussion at the MWL just past regarding measuring sun noise / moon noise. Install openCPN, enter the correct UDP network settings and you should be good to go.Īnother tip is to use a 'blank' 3.5mm audio jack so that you don't have to listen to the sound of SDR# while its listening to the frequency.
Ignore the shipplotter bit on that page and the aerial stuff too, for most purposes any old vertical antenna will provide enough range. (This is documented on the same page at: ) You will also find an audio sample on their downloads section which will allow you to test that your levels and bitrates are set correctly (it will NOT work without this in my experience).
Then you have to install AISMON from the yahoo groups page: (you have to join but its fairly painless). (This is documented more thoroughly at this link: ) Then you need to create an audio 'loop' to pipe the output from SDR# to AISMON using software called 'Virtual audio cable' or much more simply in windows7 using its inbuilt 'stereo mix' function. (The above is better documented at this link: ) This is the Radio i'm currently using although i have another one which i use specifically for picking up DAB and FM which saves messing with changing drivers all the time, that is an 'E4000' type (also available on ebay, cheap)įirst of all you install the dongle, using specific drivers which come from a package called 'Zadig'
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