Strange Display SDRSharp

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njrusty
Posts: 17
Joined: Sun Jun 30, 2019 12:28 pm

Strange Display SDRSharp

Post by njrusty » Sun Jun 30, 2019 12:34 pm

Been using V3 SDR for NOAA images and have been getting some pretty good images with my v-dipole antenna. Bought an LNA and placed in line near antenna and of course, my image quality has gone to the toilet. Seeing strange clipping on left and do not know if it is normal. Since I have the V3 and using software to turn on the BiasT it does not seem to make a difference in image quality.

Ant - LNA In- LNA Out - RTL SDR (not using external power for LNA since I have an V3 SDR). I also tried an FM blocker connected to the SDR and SDRSharp image looks the dame.

Not sure what is happening here.
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LNA.jpg
Display issue
LNA.jpg (270.47 KiB) Viewed 605 times

rtlsdrblog
Site Admin
Posts: 2410
Joined: Mon Nov 19, 2012 11:54 pm

Re: Strange Display SDRSharp

Post by rtlsdrblog » Mon Jul 01, 2019 4:38 am

Looks like there might be a strong signal overloading the LNA or RTL-SDR. Can you tune around and see if you see anything really strong?

I've mentioned this a few times, but I think an LNA is not really needed for 137 MHz, unless you have really long and lossy coax cable runs. Adding in an LNA for 137 MHz is more likely to cause reception degradation in most cases.

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