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The Aero Thread..
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<blockquote data-quote="Vipersan" data-source="post: 970590" data-attributes="member: 325666"><p>So ...at the moment I have the loop output split through a pssive filter ....one output going to SDRplay ....the other output to Airspy ..</p><p>I do have 2 different versions of SDR# running as one O/s is 64bit ...the other 32bit ..plus later versions of SDr# dont support SDRplay ..</p><p>That said I have the bandwidth set the same on each version ...and 2 versions of Jaero ..</p><p>Again one is 64bit the other 32bit...</p><p>Apart from that they receive the same Cband data ..</p><p>The reason for going to this much trouble ?</p><p>Well ..since I got Airspy ...I have had difficulties decoding the data ,,,</p><p>So I wanted to see if one receiver is more sensitive that the other ..</p><p>Well..</p><p>From my observations ..SDRplay IS indeed either a little more sensitive ....</p><p>Both receivers get more than I would like of bad R/T packets ..</p><p>but oddly Airspy totally misses packets that SDRplay picks up ...</p><p>So when the data is borderline ..SDRplay has the edge ..</p><p>This could be due to the SDRplays built in LNA ...</p><p>Does Airspy have one ?</p><p>Certainly there is a tickbox for one but is this an addon ?</p><p>19:32 flight SN359</p><p></p><p>both recivers picked this up ..</p><p>..but moments later the SDRplay logged another flight that the Airspy missed ?</p><p></p><p>I belive this is down to the SNR ..</p><p>Noted that the noise flo0r of the Airspy is naturally at 40db</p><p>Wheras the noise floor of the SDRplay is at 30db</p><p>Visibly the signals 'stand out' much more clearly on the waterfall when using the SDRplay.</p><p>It will be interesting I suppose to compare to an RTL dongle.</p><p>..anyone else have similar findings ..?</p><p>please discuss..</p><p>This is such a knife edge type system with so many variables in play ...that we need to be armed with all informations when choosing equipment when considering a permanent station.</p><p>Finally..</p><p>Such a shame the Inmarsats are in inclined orbits as all 3 in my visible arc are at least possible for part(s) of the day ..weather permitting ...on a 1 mtre dish.</p><p>rgds</p><p>VS</p></blockquote><p></p>
[QUOTE="Vipersan, post: 970590, member: 325666"] So ...at the moment I have the loop output split through a pssive filter ....one output going to SDRplay ....the other output to Airspy .. I do have 2 different versions of SDR# running as one O/s is 64bit ...the other 32bit ..plus later versions of SDr# dont support SDRplay .. That said I have the bandwidth set the same on each version ...and 2 versions of Jaero .. Again one is 64bit the other 32bit... Apart from that they receive the same Cband data .. The reason for going to this much trouble ? Well ..since I got Airspy ...I have had difficulties decoding the data ,,, So I wanted to see if one receiver is more sensitive that the other .. Well.. From my observations ..SDRplay IS indeed either a little more sensitive .... Both receivers get more than I would like of bad R/T packets .. but oddly Airspy totally misses packets that SDRplay picks up ... So when the data is borderline ..SDRplay has the edge .. This could be due to the SDRplays built in LNA ... Does Airspy have one ? Certainly there is a tickbox for one but is this an addon ? 19:32 flight SN359 both recivers picked this up .. ..but moments later the SDRplay logged another flight that the Airspy missed ? I belive this is down to the SNR .. Noted that the noise flo0r of the Airspy is naturally at 40db Wheras the noise floor of the SDRplay is at 30db Visibly the signals 'stand out' much more clearly on the waterfall when using the SDRplay. It will be interesting I suppose to compare to an RTL dongle. ..anyone else have similar findings ..? please discuss.. This is such a knife edge type system with so many variables in play ...that we need to be armed with all informations when choosing equipment when considering a permanent station. Finally.. Such a shame the Inmarsats are in inclined orbits as all 3 in my visible arc are at least possible for part(s) of the day ..weather permitting ...on a 1 mtre dish. rgds VS [/QUOTE]
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