Архив за 09.09.2019

My First GOES16 Images —

My First GOES16 Images - submitted by /u/lahorite
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My first NOAA capture

My first NOAA capture

These are my first captures of NOAA 19 with a v-dipole antenna mounted on a table in our back-garden (yard), I'm going to try at a empty field soon to see if I can get a better reception.

MSA Falsecolor Image

Channel 2-4

submitted by /u/Xerbot
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Troubleshooting Help • Measuring FM Filter Performance in Downtown Houston

I'm new to all of this and trying to learn antennas and SDR and the like by trying to get some weather satellite imagery. I built a double cross antenna (https://www.qsl.net/py4zbz/DCA.pdf) to get the imagery off the top of my parking garage in downtown Houston. I've had marginal success. In order to assist I got a RTL-SDR branded 88-108 MHZ Bandstop Broadcast FM Reject filter. I did some testing inside my apartment to see how well the filter worked with the antenna and the results were great. I had a 29.7 dB reduction in the SNR with no change in any settings.

I took the antenna up to the roof where there is no overhead obstructions at all and upon plugging in the filter (I also had a Low Noise Amplifier connected inline) the FM signal was still quite strong. This time I removed the filter and LNA from the system to check what the signal was like without anything and the SNR actually got better.

These radio stations broadcast within a few miles of me so i expect the signal to come in really strong. My question is, what is a good metric to look for to determine that the filter is working ok? Is the SNR not a good measure? Why would the SNR decrease without the filter and increase with the filter?

I wrote up a short paper detailing the tests, results, with some SDR# screenshots @
https://www.dropbox.com/s/id0cz58dtsbid ... r.pdf?dl=0

Thanks All!

Statistics: Posted by moeses — Mon Sep 09, 2019 6:46 pm

Where should an AM bandstop filter go in all this stuff

Hi all, I recently got the nooelec hf sdr kit. I set it up and discovered that the AM transmitter where I live does not go to low power at night. It stays on 100% power all the time, so I got a broadcast AM bandstop notch filter. Where should It go on the setup? Does it matter? Right now, its connected between the end of my coax and before the upconverter. Is this where it should go? Does it go on the RF out side of the upconverter?

Thanks in advance,

picture of current setup https://imgur.com/a/VS1qPEZ

submitted by /u/NodakTwoBravo
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L-Band QFH, just arrived in my mailbox :)

L-Band QFH, just arrived in my mailbox :) submitted by /u/66kalas
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Finally got clear NOAA and METEOR M2 images with V-Dipole!

Finally got clear NOAA and METEOR M2 images with V-Dipole!

After wasting a lot of time with making QFH antenna, I tried simple 120º V-Dipole and it is surprisingly good! It is amazing how $30-equipment (rtlsdr+antenna) allows receiving images from space :)


Sunset over Europe from METEOR M2-2

Ukraine and Eastern Europe from METEOR M2

submitted by /u/s1ider
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Long Range Cordless Phone Not Secure,Monitor Long Range Cordless Phone W…

Long Range Cordless Phone Not Secure,Monitor Long Range Cordless Phone W... submitted by /u/Kourosh07
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KerberosSDR • Re: Feasibility of a Passive Weather Radar

Since only two receiver are needed, could two of mixers like
work for the 2,880MHz frequency of the WSR-88D ?
(to get into the kerberos pass band)

With two matched directional antennas, one pointed toward the
noaa transmitter, and the second toward the storm cloud interest.

And get a the return pulses every minute as the main beam scans in your direction ?

Statistics: Posted by ac8dg — Mon Sep 09, 2019 12:41 pm

KerberosSDR • Re: LNA

My experience with Doppler Systems(waiting on my KerberosSDR), with to much amplification there would be increased multi-path. Of course all of this depends on distance and power of Signal you are trying to DF. Very weak signal could use amplification, but as you get closer to the source it would help if amplification were dropped.... or better -- even adding attenuation!

Statistics: Posted by myke — Mon Sep 09, 2019 12:30 pm

Andreas Spiess Explains Software Defined Radio in YouTube Video

Over on YouTube Andreas Spiess has uploaded a video titled "How does Software Defined Radio (SDR) work under the Hood?". The video is an entertaining introduction to how software defined radio works and begins from the beginning by explaining how basic analogue radios work with components such as modulators, demodulators, frequency generators, mixers and filters. After the basics he goes on to explain the digitization of radio signals that occurs in SDRs, and gives an introduction ADCs and how IQ sampling works.

Later in the video Andreas shows various applications for SDRs, discusses various SDRs on the market like RTL-SDR, HackRF, SDRplay, LimeSDR and PlutoSDR and introduces GNU Radio Companion and other SDR programs from our big list of software post.

How does Software Defined Radio (SDR) work under the Hood?

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