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About irregularly generated noise

Posted: Thu Nov 01, 2018 4:43 pm
by Taiki
Hello.

I am in trouble because of irregularly generated noise.

I am trying receive morse code from CubeSats with RTL-SDR V3 and SDR-Console V2.3.
Noises appears suddenly at all frequencies.
This noise covers the weak signal.
In most cases, the noise disappears in about 3 minutes.
What can I do to solve this problem?

The first image is normal water fall, and the second image is water fall with noise.
Thank you.
Taiki.
wf_normal.png
wf_normal.png (279.16 KiB) Viewed 2239 times
wf_noise.png
wf_noise.png (271.89 KiB) Viewed 2239 times

Re: About irregularly generated noise

Posted: Fri Nov 02, 2018 3:22 pm
by rtlsdrblog
It could also be a strong signal coming in and desensitizing the dongle. The way to fix that would be to use a fllter.

Re: About irregularly generated noise

Posted: Sat Nov 03, 2018 2:46 pm
by Taiki
Thank you for your reply!
I started making band pass filter.
After adding the BPF,I will report.
Taiki.

Re: About irregularly generated noise

Posted: Thu Nov 08, 2018 6:08 am
by Taiki
BPF worked perfectly!
I observed water fall for three days. No noise appeared.
Fortunately, the noise floor has decreased by about 2 dB.

Thank you very much again!
Taiki.