tag:blogger.com,1999:blog-1126984176108779019.post1312414753115390199..comments2024-03-03T21:39:37.833ZComments on Arctic DX: SDR-IQ First ImpressionsBjarne Mjeldehttp://www.blogger.com/profile/03405758708145585467noreply@blogger.comBlogger5125tag:blogger.com,1999:blog-1126984176108779019.post-18328373989287532007-03-20T09:58:00.000Z2007-03-20T09:58:00.000ZHi all;I forgot to mention that my -140 Noise floo...Hi all;<BR/>I forgot to mention that my -140 Noise floor with BOG was with SDR-14. I wonder if the noise floor of IQ is a bit higher, am I right? As fas as I know the NF of SDR-1000 is "best" ever seen in these sdr-rx´s.<BR/>73 tarmoAnonymousnoreply@blogger.comtag:blogger.com,1999:blog-1126984176108779019.post-43842437251194290452007-03-19T03:34:00.000Z2007-03-19T03:34:00.000ZHi Bjarne,Tarmo's comments about a low noise floor...Hi Bjarne,<BR/><BR/>Tarmo's comments about a low noise floor down to -140 was encouraging. On my SDR-1000 blog, a number of the screenshots over the months show a noise floor in the -130 to -135 range. The best I've seen is about -140 while DXing with a Beverage antenna at a very quiet location on the Washington coast. Here's one blog entry showing a couple of screen captures with a -130 to -135 floor between the signals: http://sdr-1000.blogspot.com/2006_07_30_sdr-1000_archive.html These were taken while DXing from my home QTH. All of this considered, I think you too will see (and hear!) a very quiet SDR-IQ when you are in a better location with various antennas. Best wishes, Guy4nradiohttps://www.blogger.com/profile/14357883948018842964noreply@blogger.comtag:blogger.com,1999:blog-1126984176108779019.post-13506348517124841232007-03-18T10:13:00.000Z2007-03-18T10:13:00.000ZHi Bjarne;Nice to hear about your results. I agree...Hi Bjarne;<BR/>Nice to hear about your results. I agree with you about the dynamic properties & sensitivity. If anyone has compared or measured values to SDR14 we should be pleased to hear of that. The noise floor really depends a lot of the QTH & antenna. I have tried mine at low noise rural qth with BOGs showing NF down to -140 while at my home with amplified ALA100 shows a NF typically as high as -110 dB...<BR/>73s Tarmo (some tests also at pudxk blogs)Anonymousnoreply@blogger.comtag:blogger.com,1999:blog-1126984176108779019.post-72780054437540891552007-03-18T04:39:00.000Z2007-03-18T04:39:00.000ZFor obvious reasons, I'm very interested in hearin...For obvious reasons, I'm very interested in hearing more about how the IQ works in the real world of dxing! I'm hoping to use my IQ as a kind of "RF vacumm" during interesting openings at my cottage on the Queen Charlotte Islands, an area of generally low noise.Walt Salmaniwhttps://www.blogger.com/profile/12043535910005044153noreply@blogger.comtag:blogger.com,1999:blog-1126984176108779019.post-49658582976433726622007-03-17T23:33:00.000Z2007-03-17T23:33:00.000ZHi Bjarne,Nice initial comments; thanks for postin...Hi Bjarne,<BR/><BR/>Nice initial comments; thanks for posting your thoughts. I have Walt Salmaniw's new SDR-IQ in the shack here; I am constructing a proper enclosure for the device and will be delivering it to him whenever we meet next.<BR/><BR/>I haven't yet powered up his SDR-IQ to see how it performs here. However, I was surprised to see the rather high noise floor between signals on the SDR-IQ at your location. My SDR-1000 here in suburban Seattle USA typically registers a -130 to -135 dBm noise floor between signals on its calibrated display. I wonder if your Loran C station is still causing problems despite the notch filtering?<BR/><BR/>I'll be interested to follow your further SDR-IQ observations. When I get Walt's powered up I'll let you know what I find. Also, I plan to be at a coastal DXpedition in 2-3 weeks, and will probably have Walt's SDR-IQ along for comparisons. 73, Guy4nradiohttps://www.blogger.com/profile/14357883948018842964noreply@blogger.com