Birdies / harmonics and combining RTL SDR device

cypherstream

SatelliteGuys Pro
Original poster
Jul 6, 2010
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This is a 3 part post (rather than 3 separate posts).

Birdies

Do you encounter a lot of signal birdies? For example off the top of my head at exactly 144.0000 MHz, there appears to be a very strong birdie. Huge signal peak but the audio is nothing. It opens squelch to silent audio. There's a few of these around even in the 1000-1300 MHz range.

Harmonics
Also do you ever pick up signals shifted to alternate frequencies because of harmonics? I have one at 859 MHz and it appears I'm also picking it up at 932 MHz.


Combining
A third question... if one of these only has a 2.4 MHz bandwidth, could you combine two to get 4.8 MHz, or combine 3 to get up to 7.2 MHz bandwidth? Just thinking on trying to cover wideband data transmissions to pass through GNU Radio. (Like QPSK and QAM).
 

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