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).
 

Rf Space Sdr Receive Radios

Fo Time, the Other Ham Radio Podcast-

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