Originally posted by abcd567
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In your experiment we can rule out that there is any significant line loss in the coax because it's very short.
The first stage of the DVB-T Dongle's tuner will be a built in preamp. The gain set on this preamp is probably set lower then optimum for ADS-B reception as its real purpose is to be used as a ATSC TV receiver.
It would be interesting if you could repeat the same experiment with various other tuners including a Mode-S Beast http://www.modesbeast.com/radarcape.html
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