Архив за 12.09.2019

KerberosSDR • Single U.FL to SMA adapter faulty

My second-batch KerberosSDR arrived, and the first thing I did was give it a shakedown test. The fourth SDR wasn't showing any appreciable signal (using the same antennas as the other three) but it was showing increased signal when the noise source was enabled. So I opened up the case and tracked the problem down to the U.FL to SMA adapter going from the fourth SDR channel to the case. I removed the adapter from the board, and an ohmmeter test showed no resistance from the pin to the ground (the threaded side of the SMA connector).

What do I need to do (or who do I need to contact) to get a replacement U.FL to SMA adapter so I can get up and running?


Statistics: Posted by AdamMaras — Thu Sep 12, 2019 10:23 pm

Comment on Tutorial: Setting up a Low Cost QRP (FT8, JT9, WSPR etc) Monitoring Station with an RTL-SDR V3 and Raspberry Pi 3 by john

Pulse audio wont load “Establishing connection to PulseAudio. Please wait…”

HELP, No signal when trying to download image from NOAA satellite.

HELP – I am getting no signal from any noaa satellite (15, 18 and 19). I am using a V Dipole (made out of metal pipes), an NESDR mini and 50 ohm coaxial cable (with 2 junctions to change to different connectors). I am using CubicSDR with WXtoImg (connected by VB Audio virtual cable). Does anyone know why i am not getting a signal and what the fix is? I live in the uk and I have tried on as many satellite passes (found using wxtoimg) as I can. Thanks in advance.

submitted by /u/mnrfalyb
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Dead RTL?

Dead RTL?

My RTL-SDR V3 has been working fine. All of a sudden, I click play in GQRX and nothing happens...


I also tried with other software, none of which got my RTL-SDR to show anything (they used to work with the RTL fine)... What could have gone wrong and how can I fix it?

Here's the output of `rtl_testl -d 1`:


submitted by /u/Coto_16
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Re-create 90s-era TV scrambling


My attempt at an authentic re-creation of old analog scrambled channels. It would have been more fun to decode a real scrambled channel in the wild, but those signals are long gone. So next best thing: make my own. Nostalgia rush!

Technical details: I captured an NTSC signal @ 6MHz bandwidth with my RSP1a, demodulated it with GNU Radio into composite video, modified that signal with "Gated Sync Suppression" scrambling using python, and re-broadcast to the TV using the FL2K VGA adapter hack.

submitted by /u/mrgriscomredux
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KerberosSDR • Re: Chaining 2 KerberosSDR’s

how do we enable the noise source via gpio? Can i do it via usb? I am using gnuradio because I am doing beam steering instead of doa. I can use my own noise source but much better to use the internal source.

Statistics: Posted by Docdailey — Thu Sep 12, 2019 6:21 pm

KerberosSDR • Re: Feature requests / development ideas

rtlsdrblog wrote:
Sun Sep 01, 2019 3:52 am
k5cg wrote:
Sun Sep 01, 2019 2:02 am

3. Having to disconnect 4 antennas (optionally connect the terminators) to sync, zero the IQ, and then reverse all of that, is time consuming. The system would be less tedious if you could use PIN diodes to switch the antennas off (to terminators or ground) right on the PCB under software control. The user would never have to disconnect the antennas. Further, Sync and IQ zero could be automated in software.

Thanks for the great product!

Future updates will also see a streamlined one click calibration process, that just runs the steps one after another, and checks that the graphs have been zeroed itself.
I just got mine the other day, and I see a lot of possibilities going forward.

Could the calibration process be a table file (multi-point) across the Spectrum or Band. That way you only need to calibrate at startup or once in a while?

Statistics: Posted by KD7JJY — Thu Sep 12, 2019 4:57 pm

METEOR-M N2-2, 75° peak. Edited in Gimp, original in comments

METEOR-M N2-2, 75° peak. Edited in Gimp, original in comments submitted by /u/derekcz
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Troubleshooting Help • Re: How to enable Bias-t for SatNogs station?

New update. The latest release of the SatNogs Pi Image (found at the below link) is written for Rasbian Buster and should allow for the usage of the bias-t switch. I won't have time to test until this weekend, but I will report my findings here.

https://gitlab.com/librespacefoundation ... gen/-/tags

Statistics: Posted by K3RLD — Thu Sep 12, 2019 4:22 pm

Automatically change frequency to the next (NOAA) sattelite to pass

So i just captured my first image from a sattelite, its from the NOAA 15, and now im waiting for the next one to pass which is NOAA 18.

But now i just realized that the frequencies from the other NOAA sattelites are kinda far away from each other, so i cant just leave it at one frequency and hope that it will fit in my bandwidth selection window.

So are there a way to have sdrsharp (or other sdr software on Windows) to automatically switch to the next frequency and have it always capturing from all the passing sattelites? Maybe somekind of addon/plugin for sdrsharp?

I'm using WXtoImg to record and do the decoding, i use the auto record feature but I think it only works once and then it goes to standby again after one capture? Im not sure as i have only capture something once.

Tl;dr how to automatically change frequency to the next sattelite that is about to pass?

Sorry if this is the wrong subreddit for this post

submitted by /u/DepressedPotato420
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