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KerberosSDR • Re: Android App connection error

Hi, I did give permission to the App and pointing to 192.168.4.1:8081. I've reinstall the App but still shows wrong position and "Error occurred for updating DOA value". I also try to disable Data.

Statistics: Posted by mdacosta — Wed Apr 24, 2019 1:19 pm


KerberosSDR • Re: Feasibility of a Passive Weather Radar

the WSR specs are so you can see not only the frequency but the emitter power used to illuminate the weather stuff. your chances of -passive- weather radar are low, unless you just happen to live near a WSR installation. :-)

Statistics: Posted by kb3cs — Wed Apr 24, 2019 11:20 am


Antennas • Re: Another Double Cross Antenna build (went wrong)

Can you extend the pole above the dish and increase the distance to the dish. Assuming that your dish is pointing to South (Astra?), it could be the Impact of the dish. It looks like the dish is within/to close to the antenna elements. If you mount the antenna 180° mirrored in azimuth the Problem should remain, if I'm correct with my assumption.

Statistics: Posted by snn47 — Wed Apr 24, 2019 11:18 am


KerberosSDR • Re: Feasibility of a Passive Weather Radar

I knew that the WSRs used RF in the upper microwave range. That's why I said "relatively low frequencies".

The main thing that was pointed by out rtlsdrblog was that only those frequencies really reflect rain, and I guess that's kinda what I was asking. I couldn't seem to find anything on frequencies and their reflection/absorbtion to water.

Anyhow, I guess some testing with more severe storms that contain hail could be useful though it seems that, that isn't going to work either. As the only powerful transmission towers at a high frequency is Cell towers and that's at most 900MHz.

Maybe something can be used in regards to attenuation as a rain "core" comes between the receiver and the tower. To at least detect something.

Statistics: Posted by kuhny1 — Wed Apr 24, 2019 2:33 am


KerberosSDR • Re: Feasibility of a Passive Weather Radar

https://www.roc.noaa.gov/WSR88D/Enginee ... hInfo.aspx

Statistics: Posted by kb3cs — Tue Apr 23, 2019 11:52 pm


Troubleshooting Help • Re: Old laptop Acer aspire 5100 sdr#

I Googled Amd Turion 38 mk, and it appears that it's only 1 core. So I think it would be quite slow. Generally at least a 2-core processor is recommended.

Statistics: Posted by rtlsdrblog — Tue Apr 23, 2019 11:38 pm


KerberosSDR • Re: Feasibility of a Passive Weather Radar

Weather radar actually operates at 2-4 GHz, so outside the range of the RTL-SDR. Only these frequencies really reflect clouds and rain. Also the bandwidth is probably not large enough to get any sort of resolution.

That said, I have noticed that on windy days I can sometimes get patterns across the PR display. I believe this is coming from the wind and maybe rain rustling the trees. Using a DVB-T TV frequency at ~600 MHz.

Statistics: Posted by rtlsdrblog — Tue Apr 23, 2019 11:35 pm


KerberosSDR • Feasibility of a Passive Weather Radar

Just a quick question,
Would it be possible to use the passive radar capabilities to make a weather radar? I mean, the only reason I can't see it working is because of the relatively low frequencies you would need to work at. But if returns can he picked up from say, hail or very heavy rain, I could write a program that screen grabs the KSDR application window and then based off the direction the antenna used for receiving echos a RHI and PPI plot could be made as it is sweeped a across using steppers.

Of course there would be a dead spot in the direction of the transmitter though that dead spot could be narrowed with a calibration run on a clear day.

This would really be my only use for the PR system and my main reason for wanting the KSDR is for the direction finding.

Any thoughts?

Statistics: Posted by kuhny1 — Tue Apr 23, 2019 11:11 pm


RTL-SDR Discussion • Re: WFM Squelch

The signal bandwidth and subcarriers (for stereo, data, etc.) in WFM broadcasts interfere with the typical capture algorithms/filters used for NFM squelch. Those same capture algorithms work extremely poorly for AM.

Statistics: Posted by hotpaw2 — Tue Apr 23, 2019 4:12 pm


KerberosSDR • Re: cb transfer status: 5, canceling

perhaps try running rtl_test at a lower RTLSDR sampling rate?
-->> [-s samplerate (default: 2048000 Hz)]

Statistics: Posted by kb3cs — Tue Apr 23, 2019 1:20 pm


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