Архив за 18.08.2019

Troubleshooting Help • Re: No RTL devices available

Are you using the EXTIO version of SDRUno? If not it won't see any RTL devices because it isn't meant for them. Version 1.22 is the only one that has this capability.

Statistics: Posted by bmh — Sun Aug 18, 2019 11:00 pm


Comment on Using a Drone and HackRF to Inject URLs, Phish For Passwords on Internet Connected TVs by Hijacking Over the Air Transmissions by None

C Band here is that death.
And why use (just) a HackRF when tere are other SDR Out there? There are also some propper DVB-S Modulator Out there.

Comment on Using a Drone and HackRF to Inject URLs, Phish For Passwords on Internet Connected TVs by Hijacking Over the Air Transmissions by tech_skilled

It won’t work. Main reason is that HackRF max bandwidth is 20 MHz, where most of satellite transponders broadcasting MCPC transmissions – are around 33-36 MHz each.
Also HackRF won’t be able to disrupt signal between satellite and LNB, because it is working up to 6 GHz, where satellite signals are mostly in Ku-band, above 10,7 GHz (only C-band would be eventually feasible).
Even if we will talk about C-band – Hack RF operator, potential attacket would have to know what exactly user is watching, because it won’t be able to disrupt all possible C-band transmission. And even if he would try – satellite signal is received by LNB not from everywhere, but by precisely pointed satellite dish. HackRF would have to spot precise beam right beside dish or get between dish and LNB.
Alternative to this is to do an attempt to disrupt signal between LNB and receiver, which is converted to L-band (9750 – 2150 MHz). But again – as we don’t know what exactly user is watching, we won’t be able to disrupt signal and additionally even if we could – signal at this point is going through (in most cases) solid cables with solid isolation, doubt if HackRF would be able to be strong enough to make any distuption bigger than making noise which will lower legitimate signal – we have to keep in mind that legitimate signal is still broadcasted as in DVB-T so HackRF would habe to be extremelly powerfull.
Basically I see no such possibility to satellite aswell.

User Projects • Re: A Funny/Interesting SDR# Project

thanks for view update

the line
data(end:-1:1,:)

is flipping the image upside down
i'm sure there is a matlab command for this.

Statistics: Posted by sdrmatlab — Sun Aug 18, 2019 9:37 pm


N connector question

Since I’m still having problems receiving GOES I’ve been going through every inch of my setup and found something interesting. The N to SMA adapter I’m using doesn’t have a pin in the center of the SMA, but my other SMA adapters do (see image). Now, I figure this is fine because my other Ns have it, but I’m curious why they’re designed like this.

photo

submitted by /u/badcomponent
[link] [comments]

User Projects • Re: A Funny/Interesting SDR# Project

I think it will be better to see it in such way :)

CODE:

clear allclose alldata = imread('c:\49mhz\p3.png');data = rgb2gray(data);data = data(end:-1:1,:);data = double(data);data = fftshift(data,2);data = ifft(data,[],2);data = ifftshift(data,2);data = reshape(data.',1,[]);iq = data / max( abs(data));iq = [real(iq)' imag(iq)'];fs = 48e3;audiowrite('c:\49mhz\iq_49mhz_phones.wav',iq,fs,'BitsPerSample',16);
it works, but the image needs to be mirrored up/down

Statistics: Posted by radiolistener — Sun Aug 18, 2019 8:51 pm


RTL-SDR Discussion • Re: SDR# issues

qrp wrote:
Sun Aug 18, 2019 5:37 pm
Does HDSDR works ok?
Just installed it now and runs fine.

Statistics: Posted by wpa2 — Sun Aug 18, 2019 7:38 pm


SDR# plugin that displays current SW radio station?

I need a plugin for SDR# (64-bit) that displays the name, language etc. of a shortwave (maybe also mediumwave and longwave) radio station that I'm tuned into. The closest thing to what I want would be the short-wave.info plugin, but it's not supported anymore and not working with newest versions of SDR#.

I use the FMSuite plugin and I could load a database of all the stations into it, but I don't want them all displayed at once and making a mess. I just need something that shows information about the station(s) at the current frequency and time.

submitted by /u/goscickiw
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Meteor M2-2 HRPT North America! 2019-08-10 20:33 UTC RGB …note to self, remember to uncheck manchester decoder!

Meteor M2-2 HRPT North America! 2019-08-10 20:33 UTC RGB ...note to self, remember to uncheck manchester decoder! submitted by /u/quartapound
[link] [comments]

METEOR M2 question: What is the actual meaning of 0.5-0.7 in the LRPT decoder

The last few days I've been getting my first images from the meteor satellites using SDR# and the LRPT decoder.

A question that popped into my head is what is the actual meaning of the wavelength of the different channels. I get that for example the first channel represents wavelengths between 0.5-0.7µm, but what does that actually mean? If we were talking about a single wavelength, I would consider the white bits to represent 100% intensity of that wavelength and the blacks to be 0%. But when we are talking about a broad range of wavelengths that stops making sense. Maybe the range of 0.5-0.7µm can be considered as bell curve where the sensor reacts mainly to 0.6µm?

I hope that you can understand my question. If anyone has a good idea about that sort of thing please share.

Thanks!

submitted by /u/errikosmes
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