First try with the filter was not successful. I found out that the filter blocks the power-supply from RTL-SDR-Dongle to the RTL-SDR-LNA.
For the second try i mounted the filter between LNA and antenna. Result was a bit lower range, roundabout 20 nm...
And it seems that the GSM-signals aren't bothered by the filter mounted directly at antenna...
scan.png
scan.png
I think i have to buy a separate bias-tee with power-supply so that i can mount the filter directly at the RTL-SDR-Dongle...
For the second try i mounted the filter between LNA and antenna. Result was a bit lower range, roundabout 20 nm...
And it seems that the GSM-signals aren't bothered by the filter mounted directly at antenna...
scan.png
scan.png
I think i have to buy a separate bias-tee with power-supply so that i can mount the filter directly at the RTL-SDR-Dongle...
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