About irregularly generated noise

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Taiki
Posts: 3
Joined: Thu Nov 01, 2018 3:47 pm

About irregularly generated noise

Post by Taiki » Thu Nov 01, 2018 4:43 pm

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 327 times
wf_noise.png
wf_noise.png (271.89 KiB) Viewed 327 times

rtlsdrblog
Site Admin
Posts: 1859
Joined: Mon Nov 19, 2012 11:54 pm

Re: About irregularly generated noise

Post by rtlsdrblog » Fri Nov 02, 2018 3:22 pm

It could also be a strong signal coming in and desensitizing the dongle. The way to fix that would be to use a fllter.

Taiki
Posts: 3
Joined: Thu Nov 01, 2018 3:47 pm

Re: About irregularly generated noise

Post by Taiki » Sat Nov 03, 2018 2:46 pm

Thank you for your reply!
I started making band pass filter.
After adding the BPF,I will report.
Taiki.

Taiki
Posts: 3
Joined: Thu Nov 01, 2018 3:47 pm

Re: About irregularly generated noise

Post by Taiki » Thu Nov 08, 2018 6:08 am

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.

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