Архив за 11.05.2019

KerberosSDR • Re: Setting the KerberosSDR EEPROM

Well ... that fun ended pretty quickly.

Soon after I realized that the host software I was using (still without the KSDR EEPROM flashed, a.k.a. SDR Console v3, can't handle multiple instances of the KSDR, at least with the Zadig driver kit

SDRCv3 did show the RTL-SDR units as separate units and the same gimmick worked when I used two RTL-SDR dongles on SDRCv3.

Upon starting a completely separate instance of the software to cover frequencies outside of the main app's scanner's bandwidth limitations at the same time - the only way I've figured that to work is to run two instances of the software at once.

It worked fine with my previous setup of 2x RTL-SDR dongles, but for some reason, at least with just the WinUSB drivers installed (have not flashed the unit yet), SDRCv3 says that the unit is already in use, no matter which one of the tuners I choose.

I'm not sure if this has more to do with the EEPROM not being flash or how SDRCv3 handles those four instances of the detected RTL-SDR's.

The "Radio Definitions" window says there's 4x "RTL Dongle - R820T", w/ freq. 50-2000MHz each, the serial number of them being the same in each one, but the address being listed as "Generic:RTL2832U:[[serialnumber]]-x", with "x" being the number of the radio receiver from 1 to 4.

The "Option" menu lists the following: "Vendor: Generic, Product: RTL2832U, Serial: [serialno, the same in each], Tuner: Rafael Micro R820T"

One option from here on would be, that I could try out would be to try running KSDR as RTL-SDR over TCP with a Raspberry Pi 3B+. That's a whole different ordeal in of itself, then.

All help kindly appreciated, especially on whether or not I should try flashing the KSDR, given the premises that I posted earlier.

Thanks.

Statistics: Posted by StandingWave — Sat May 11, 2019 10:42 pm


Can you "hear" a bolide via radio?

In a similar fashion that lightning can be heard at very low frequencies, is it possible for a bolide to emit a signal at 137MHz? I was trying to receive NOAA 15 (or maybe 18) at night, when I saw something re-entering the atmosphere pretty violently. At the same time, some signal completely saturated my SDR, over the entire 1000KHz bandwidth I had set at the time.

In the moment, I didn't really realize that the two events could be connected in any way.

Well, calling it a bolide is maybe a bit of an overstatement. It wasn't really as bright as the moon, but it was definitely brighter than the ISS and any meteors I saw before. It was also moving much slower than your everyday shooting star. But it was definitely something burning up in the atmosphere. It was apparent that it was breaking up as well.

My other, more disturbing theory, is that it was a satellite re-entering and the signal was its transmitter screaming in agony as it was melting down, but there were not satellite re-entries documented at that time.

EDIT: I did not hear any noise coming from it

submitted by /u/derekcz
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Что слышно в радиоэфире? Радиолюбители/Ham radio …

Что слышно в радиоэфире? Радиолюбители/Ham radio
https://habr.com/ru/post/451330/

First NOAA-18 transmission I got. Any pointers from those more experienced?

https://i.imgur.com/mROdWi1.jpg

Got this NOAA-18 satellite with a v dipole antenna on a golf course in my backyard. Used sdr#. Based on my results, is this an ok very first image from a total noob?

It was cloudy and raining, I don’t know if that had aything to do with it.

Feedback is appreciated! Loving this new hobby!

submitted by /u/whoschandler
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KerberosSDR • Re: Power connection question

Whether it's used for USB2.0 legacy (so there is another hub port behind it?) or not is immaterial to the question of how power gets there and whether a standard compliant PSU recognizes the port. The high voltage PD modes can only be used after active negotiation and a PD-PSU will always be limited to supply 5V if that doesn't take place. If the port acts as a power sink for 3.0A, then both CC lines in the receptable should be terminated with 5.1kOhm to ground, otherwise the VBus of the source will not come on at all if it is standard compliant. PD supplies should recognize that as a sink port that doesn't use negotiation and provide 5V at max. 3A ("USB Type-C current"). A 3A source will advertise by injecting a nominal 330µA into the termination, resulting in a sink-side termination voltage above 1.23V.

Non-compliant PSU (i.e just having a USB-C plug attached to the output voltage) are getting quite rare. In particular I want to use a PSU that also has USB-A outputs so I can power several rasPi or TinkerBoard from those and most of them have PD outputs (which should have been tested for compliance, so require proper termination). I may have found one that doesn't switch off VBus if CC is not properly terminated, but then again the description might just not mention that.

Statistics: Posted by Stromeko — Sat May 11, 2019 5:57 pm


Comment on Receiving Es’Hail-2 DVB-S2 on Ubuntu With LeanDVB by keyle

thanks ,,, its realy work well with low snr ! i test it and successfully done .
i test window version but not got any decoding becouse its low signal , this is realy good and better and work with low snr . very thanks ..

Really enjoying being able to monitor my GOES 16 Receiver like this

Really enjoying being able to monitor my GOES 16 Receiver like this submitted by /u/bab5871
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1KUNS-PF cubesat celebrates 1 year in orbit! Transmitting a special image

Hello SDR fans :)

Since our CubeSat has survived past the 1 year mark in orbit on its own, we are transmitting a very small and simple celebratory picture. There was some interest a few weeks ago in this subreddit about receiving images from us, but it turned out to be a bit difficult due to the 9600 baud. For this, we lowered the baud down to 1200 and any SDR should be able to receive it without much of a problem!

So if you want to have some fun and hunt the image give us a listen on 437.300 MHz. The image is black and white with JPEG encoding, 14 packets long (around 1.7kB), sent every 100 seconds.Some info on how to receive it can be found on http://1kuns-pf.ns0.it/index.php/decoding-1kuns-pf/ (note though that in this case you do need the first four packets, the JPEG header is different!), you can use the gr-satellites module for GNURadio, or UH7ZO modem (in other-versions.zip) with DK3WN decoder. The images are simply two bytes indicating the packet number (0 to 13) and then the image packet itself, it would be easy to assemble the image just by looking at the output bytes from the demodulator.

We're happy to answer any question :)

submitted by /u/1KUNS-PF
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Realtime Live DVB-S2 Decoding using cheap SDR ! https://youtu.be/1JDXxU_ieEg

Realtime Live DVB-S2 Decoding using cheap SDR ! https://youtu.be/1JDXxU_ieEg



(Feed generated with FetchRSS)

KerberosSDR • Re: KerberosSDR as a simple RTL-SDR replacement tuner? Seriously.

StandingWave wrote:
Sat May 11, 2019 6:35 am
rtlsdrblog wrote:
Sun May 05, 2019 1:13 am
Remember that at it's core the KerberosSDR is four RTL-SDR dongles.

So it can certainly be used as four independent RTL-SDR dongles without any issue, and it will work on Windows too.

You don't need to do anything special. Just plug it in and treat it like four RTL-SDR dongles connected to your system.

EDIT: I just added a sticky post to the forum that shows how to program the EEPROMS on board the KerberosSDR. Certain programs might expect a serial number, so it can be set via the EEPROM.
Thank you! :geek:

I also need to apologize for my lengthy commentaries, it's just that when the unit did not come with any clear instructions, i.e. some forum posts & pages RTL-SDR, AFAIR, "clearly" pointed out that "KSDR only runs on Linux as for now". Thus, I was thinking of being rather safe than sorry and asking before I start flashing the EEPROM with just the vague clues that I previously had.

Oh boy, can't wait to plug the KSDR into the RF aether! *Straaangeerss in the niiightt....*
The main intended use of the KSDR is for coherent experiments, so the part about Linux only was probably referencing the fact that the coherent software we've made for the KSDR is Linux only.

Statistics: Posted by rtlsdrblog — Sat May 11, 2019 12:23 pm


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