greatscottgadgets / greatscottgadgets/hackrf
Tuning bug at ~1230MHz where RF second harmonic appears at IF
@mossmann is already working on this.
Since Jan 10, 2023.
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Description
What would you like to know?
I am a beginner at SDR. I have new HackRF One running 2022.09.01 firmware. The following spectrum from the UHF L-Band is essentially from
hackrf_sweep -a 0 -l 16 -g 16 -f 1220:1250 -w 40000 -N5000
There are a number of signal peaks here. For example, the small one about 1227MHz, in the middle of the first trough, which I assume is a GPS signal.
I have two questions:
-
Why does the spectrum have those two unlikely looking troughs?
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Why do I not see these troughs nor the big peak at 1225MHz when I use Gnuradio Companion to examine the spectrum around these frequencies? That is, using an Osmocom Source (20M sample rate, centre frequency at say 1226Mhz, bandwidth 40kHz) piped into a Frequency Sink.)
Is this something to do with the hardware configuration?
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