Архив за 04.09.2019

Meteor M2-2

Meteor M2-2

Hi All:

Captured my first M2-2 photo today, pulled over 50MB of data, was very impressed. This was all using the Dipole that came with the RTL-SDR kit setup at 120 degrees facing north about 10 feet off the ground with 20.5" poles. Interestingly it only pulled non-RGB channels, seen here (channels 4,5,6)

https://i.redd.it/dr9awisp0nk31.png

Combining the channels looks like this:

https://i.redd.it/e8q8gbfs0nk31.png

I know it's not an ideal antenna for this, and I'm not in an idea location, and the pass of the satellite may not have been ideal as well, but any thoughts on why I didn't get channels 1,2,3?

submitted by /u/krystlih
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Having screwed the FM-notch, I extinguished most of the signal level of the FM broadcasts. Traces of them can be seen XYZ. Turning off the monitor, I found that the FM broadcast was completely gone. But without a monitor, a waterfall is not visible. :)

Having screwed the FM-notch, I extinguished most of the signal level of the FM broadcasts. Traces of them can be seen XYZ. Turning off the monitor, I found that the FM broadcast was completely gone. But without a monitor, a waterfall is not visible. :) submitted by /u/klounader
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Signal Identification Help • Any ideas? Digital signal on 177.650Mhz

HI,

Completely new to all this stuff! Found a signal on 177.650 Mhz Narrowband FM, seems to be some form of digital signal, any idea what and more importantly can I decode it?

https://www.dropbox.com/s/xbqv2k4extikj ... F.wav?dl=0

Statistics: Posted by blinky — Wed Sep 04, 2019 10:21 pm


RTL-SDR Discussion • mute on transmit

I have a RTL-SDR and am using Sharp. I am a Ham and am using this on HF. Everything is up and running but I am trying to figure out how to completely mute the audio from the dongle and computer when I transmit on a separate transceiver. I have it set up so the antenna connection to the dongle is disconnected and grounded during transmit but I still get a full audio hiss from the computer during transmit. Is there a way to mute this audio? If not it is basically useless to me because I can not have this audio noise present when transmitting. Thanks, Todd K1TOD

Statistics: Posted by k1tod — Wed Sep 04, 2019 9:58 pm


Hacking Iridium Satellites With Iridium Toolkit

Hacking Iridium Satellites With Iridium Toolkit submitted by /u/Yasnieltc
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KerberosSDR • Re: Feature requests / development ideas

Another idea...

For the UCA antenna arrangement (maybe ULA also), rather than have to set the lambda in the DOA Estimation page, how about just an entry for the antenna element spacing.

Then have the software figure out the radius. If you change frequencies and don't adjust the antenna spacing then a new lambda is automatically calculated for you.

My point is that the Pi is a computer - so why do I need to get my calculator app out on my phone to determine this number?

Statistics: Posted by k5cg — Wed Sep 04, 2019 9:03 pm


KerberosSDR • Re: Feature requests / development ideas

GermanTerrible wrote:
Tue Sep 03, 2019 8:34 am

Perhaps the "manual mode bearing" setting will help you when using compass or GPS as well. I cannot try myself because I have no car of my own. I always work from fixed points.

If it does not work, record a log file as usual. Then try to change "bearing mode" to manual when plotting the log, and set "manual mode bearing" as needed, it could work.
OK I will set the antennas up as I suggested and try Manual mode. Thanks

Statistics: Posted by k5cg — Wed Sep 04, 2019 8:58 pm


Hurricane Dorian NOAA

Hurricane Dorian NOAA submitted by /u/DeerSpotter
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netdog к «Обновлен плагин дополнительного радиоканала «Aux FVO»»

Василий, почему-то плагин не стартует на 64 битной версии sdrsharp. Хотя вроде ничего не должно мешать.

My signal has doubled by changing antenna

My signal has doubled by changing antenna

Hello,

So to step up my SDR game I decided to upgrade from a basic V-dipole to a double cross antenna. I built the antenna following this paper. But while trying this new antenna to receive a picture from NOAA I noticed that the signal was showing two times, shifted a couple a Khz (as you can see in the attached picture), and it is preventing the decoding of the picture.

One of my supposition is that I don't properly rephase the signal coming from the different parts of the antenna : the paper says that the two coaxs coming from the East/West dipoles must be λ/4 (14.25" in this case) longer than the coaxs coming from the North/South dipoles. I added the right length to these coaxs, the only thing I changed is that all my coaxs are 75Ω instead of 50Ω (because it is more easily available and my sdr was advertised at 75Ω too). So maybe I was wondering if the propagation speed was different between the different coaxs? If so how could I calculate the coax length needed to the rephasing? My second supposition was the the signal could be reflected onto something (there is a zinc roof nearby), is that even possible?

https://i.redd.it/gatx1p2rslk31.png

So I'm turning to you, the smart guys at r/RTLSDR, for some help or suggestion about this. Thanks you :)

submitted by /u/Umbb3a20
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