Search found 2814 matches

by rtlsdrblog
Thu Jan 14, 2021 10:53 pm
Forum: RTL-SDR Discussion
Topic: Dangers of ESD
Replies: 2
Views: 243

Re: Dangers of ESD

By hand is fine. The ESD diodes in the dongle can handle that easily. And there is a bleed resistor on the dipole itself.

Outdoor ESD from high winds/sand etc may be too high. Direct or nearby lightning when connected to an unprotected outdoor antenna will fry it.
by rtlsdrblog
Wed Jan 06, 2021 10:50 am
Forum: Other SDR Devices
Topic: I want to try Direct sampling mod on Astrometa dongle
Replies: 1
Views: 826

Re: I want to try Direct sampling mod on Astrometa dongle

Should be the same as the old hack https://www.rtl-sdr.com/rtl-sdr-direct-sampling-mode/

Just solder a wire to one of those bottom-left two caps.
by rtlsdrblog
Wed Jan 06, 2021 10:48 am
Forum: Troubleshooting Help
Topic: No audio
Replies: 1
Views: 182

Re: No audio

Please provide screenshots of your settings.
by rtlsdrblog
Wed Jan 06, 2021 10:48 am
Forum: Troubleshooting Help
Topic: Need help running HeatMap.py - IndexError
Replies: 1
Views: 629

Re: Need help running HeatMap.py - IndexError

I saw this before. The solution was to simply massage the input data by just thresholding those bad values to something reasonable.
by rtlsdrblog
Wed Jan 06, 2021 10:42 am
Forum: RTL-SDR Discussion
Topic: Police radio changing frequency often
Replies: 4
Views: 712

Re: Police radio changing frequency often

Once you've set up trunking with Unitrunker (or even DSDPlus can handle trunking by iteself), then it will auto follow. Here is one tutorial with just DSDPlus and two dongles https://www.hagensieker.com/wordpress/2018/11/18/dsd-trunking-tutorial/ He uses an RTL-SDR and Airspy, but you can just as ea...
by rtlsdrblog
Thu Dec 31, 2020 1:25 am
Forum: KerberosSDR
Topic: Begginer question
Replies: 1
Views: 501

Re: Begginer question

What model of Pi 4 do you have? The higher RAM models seem to have a bug which make the SD Card unable to work.

COnnect a monitor to the Pi first to see what's happening if possible. You don't need the antennas connected for the Pi's WiFi to work.
by rtlsdrblog
Thu Dec 31, 2020 1:23 am
Forum: Antennas
Topic: Does anybody have own radio telescope?
Replies: 2
Views: 866

Re: Does anybody have own radio telescope?

To receive an individual star you'll need a huge dish, or some sort of distributed array.

Most RA hobbyists focus on h-line reception and mapping the galaxy with that, or receiving pulsars which are nice and strong.
by rtlsdrblog
Thu Dec 31, 2020 1:18 am
Forum: Troubleshooting Help
Topic: getting rid of what Zadig did
Replies: 2
Views: 548

Re: getting rid of what Zadig did

That means that you probably clicked around randomly in Zadig and overwrote your audio drivers instead of the RTL-SDR ones. Just go into device manager, find the device, right click and go to update driver, browse, let me pick, and there you should be able to roll it back.
by rtlsdrblog
Thu Dec 31, 2020 1:15 am
Forum: RTL-SDR Discussion
Topic: RTL-SDR bandwidth 2,4 MHz stable and 3,2 MHz capability, please explain
Replies: 1
Views: 511

Re: RTL-SDR bandwidth 2,4 MHz stable and 3,2 MHz capability, please explain

At 3.2MHz there will be a number of dropped samples. That means that there will be some signal data missing, resulting in crackly audio, and resulting in digital modes failing to decode. However, if you don't need to listen or decode, and you just want to look at the spectrum visually, then it doesn...
by rtlsdrblog
Thu Dec 31, 2020 1:13 am
Forum: RTL-SDR Discussion
Topic: Record whole bandwith spectrum and review later
Replies: 5
Views: 655

Re: Record whole bandwith spectrum and review later

The rtl_sdr command line tool records IQ files. Convert to SDR# IQ format with https://github.com/Marcin648/iqToSharp

The converter is a few years old though, so hopefully it works.