hhm0 Posted January 3, 2014 Share Posted January 3, 2014 After reading the awesome post @ http://s4gru.com/index.php?/blog/1/entry-345-whats-the-frequency-kenneth-interpreting-your-engineering-screen-part-one/, I decided to do some stuff with my LG-D820, RTL-SDR(w/E4000,and a 1-paper-clip antenna). Using the calculations mentioned in that post, I tuned to the 18xx frequency, and to the 19xx, based on the info from 1x engineering. I saw a wider signal than I was expecting, but soon found that the 1900 band uses 5MHz allocations, and not 1.25 as 800 does. I have been getting eHRPD w/EVDO, and occasionaly 1x, so did not need to check LTE. I made a call, checked for new email, and streamed video, as testing. However, according to that post, 18xx is uplink (phone to tower) and 1900 is downlink (tower to phone). This was what the looking around showed me. However, I only saw traffic on the uplink (a lot, proportional to the actions being performed (email checking makes a bit of activity, and watching streaming video makes much more, for longer). However, on the downlink frequency, no discernable activity showed. Is this because my paper clip antenna will not pick up the towers anyway, or is this my device doing secret stuff? :-D Or is an alternate downlink frequency being used, or is my device rebroadcasting traffic (for the NSA :-D), or maybe for traffic alleviation via mesh network :-D? Attached is the screen of SDR app! Enjoy! :-) 1 Quote Link to comment Share on other sites More sharing options...
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