Архив за 02.06.2019

Very sorry, genuine question

I follow this sub because I always see cool projects coming out of it. For a long time it seemed like photos from space. Now it is much wider variety.

I don't feel the sidebar is terribly illuminating about what this sub is. What can I read to learn more?

submitted by /u/WeightliftingTA
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NOAA HRPT via GOES-17, 16

NOAA HRPT Setup - GOES+Orbital

See above link to picture of my setup.

1m 1.7-2.2GHz grid antenna NooElec SAWbird LNA for GOES SDRplay RSP1a

To software: SDRUno USA-Satcom XRIT Decoder

I have the options and questions in red on the attached image. Should I keep the SDR close to the antenna if I have the option of using LMR600? It may be nice to have the SDR closer to the computer. But I need to power the LNA - Any recommendations for a small solar panel kit? I have a 12,000 mAh mophie I could use to be the battery in the system.

I also have the option of using a raspberry pi somewhere in the system. I bought one and its collecting dust so any thoughts or recs there would be appreciated. Somehow use it for the storage aspect? The eventual goal is to have this pulling images and storing them temporarily, to be displayed on a large constantly updating screen in my home.

submitted by /u/SoUnfortunate
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Working on a GOES-16 setup and would appreciate power-usr feedback on how to "debug" my issues

I'm working on a GOES-16 setup and am trying to put the work in this week to see whether or not I should pay someone to come to my apt complex to mount the dish for a more permanent reception capability (a $600 outlay, so I'd prefer to fix my reception issues PRIOR to scheduling an installer).

https://imgur.com/a/TU4o3t7

  • ZDA AGP 1721-19dbi with no secondary reflector (should I make/buy one?)
  • SAWbird + GOES LNA
  • Airspy Mini
  • Raspberry Pi 3

Although it may be hard to see, the dish pointing clears the treetop and the further treeline just fine. The raspi3 has plenty of power and is running goestools. Sadly, my vit(avg) is in the solid 2100s and drops are consistently 20+.

submitted by /u/zurielseven
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Comment on Airspy HF+ Discovery Now Available for Preorder + Brief Initial Review by BT

Now the questions are…

1) Why go to a single antenna input and a plastic case?
2) Were the dual antenna inputs of the Airspy HF+ leaking into each other?
3) All the problems with images in the VHF of Airspy HF+, is that fixed?
4) Why so small? Won’t it get hot being that compact? Will the plastic case dissipate the infamous Airspy heat?
5) Will there be another orgy of firmware updates to fix problems that should have been fixed prior to release?
6) Why such a small bandwidth of 768 kHz?
7) Will there be a trade-in program for original, dissatisfied buyers of Airspy HF+ wanting to chance it one more time with the Discovery version?

“No external band aid filters are required. While the in-band performance of the Band-III tuner is excellent, it will require some filtering for very strong out of band signals at multiples of the tuned frequency.”

Troubleshooting Help • Re: rtl-sdr lna problem

I can recommend there LNA: https://www.ebay.com/str/gpiolabs
The have an ecternal USB Source its nice and plug and play. :D

Statistics: Posted by Username — Sun Jun 02, 2019 9:45 pm


Other SDR Devices • Suggestions for SDR kit

Hi all,

I am interested into SDR developments and I am looking for a FPGA SDR kit that should allow me to develope some DSP algorithm using received signals. Using Zynq architecture (for which I have experience with) would be a plus.

I am not looking for some kit with Linux pre-installed, that allow you to just install some packet using apt-get and that's all.

I found the ADALM-Pluto kit (https://www.sdr-radio.com/Radios/Pluto) but I am not sure if it allows you to program the PL...
I also know the Raptor SDR (Zynq Ultra Scale) but its price its around 4k $.

Do you know others FPGA based SDR kit for hobbyst purposes ?
Regards,
s.

Statistics: Posted by ssdrz — Sun Jun 02, 2019 9:35 pm


Troubleshooting Help • Re: rtl-sdr lna problem

recording of noaa 18 satellite pass with 67 deg max elev was unsuccessful.

started off with fm trap to rtl-sdr LNA to rtl-sdr dongle running sdrsharp at 0 rf gain and got nothing but noise. looking at the attachment, the pass starts at the top. the black strip is when i turned off sdr sharp temporarily and turned the LNA off and on, to make sure it was on.

but nothing but noise. then, disconnected the LNA and connected directly to the dongle with rf gain increased to 28 db, and the image appears. the transition is abrupt, indicating that the LNA is not doing its job.

the strange thing is that at 118.1 MHz and 162.55 MHz, the LNA with 0 db rf gain seems to provide as much gain as the dongle with 28 db of rf gain and no LNA. but the LNA doesn't seem to provide any gain at 137 MHz.

what kind of improvement should the LNA provide compared to the bare dongle with 28 db rf gain when receiving noaa satellites? is my lna defective?
noaa-18-1906020905-norm.jpg

Statistics: Posted by rjmura — Sun Jun 02, 2019 9:24 pm


If I wanted to use RTLSDR to analyze the RF content in the venue that I work at, to find frequencies to setup wireless mics at, what equipment and software would I need?

I’m thinking a budget of about $200 USD, not including the computer. Also a plus if the whole setup can fit in a backpack, and can be setup on a small 3x3 table.

Thanks in advance!

submitted by /u/fat-doink69
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Comment on Getting the V3 Bias Tee to Activate on PiAware ADS-B Images by JON ADAMS

Here’s an interesting thing – I had two RTL-SDR v3s, both with the “enableable” bias-T function, but had never used that function. The both had provided at least a year or two or more of solid service for a number of projects I had, most recently being on the downstream side of homebrew Piaware ADS-B amp/filter front ends, where they worked just fine.
I just purchased the ADS-B 19090 MHz LNA (RTL-SDR product) because I was intrigued by the massive filtering design of the device. I have transmitters (10-50 W or more) often nearby, and SDR desense is common without good filtering.
This is where it went bad. The first LNA/filter unit arrived a few days ago, I connected it up right at the antenna (a Flightaware 1090 MHz stick), and proceeded to figure out how to get the SDR dongle to activate the bias-T function. The thread here was fundamental to getting the bias-T voltage output to activate on a Piaware RaspiPi build.
In any event, after a few days of struggling with getting the bias-T to activate reliably, and getting Piaware to not balk at the hardware access, the first (and most recent) RTL-SDR V3 up and died on me. “Died” in that, if inserted into a RaspPi, prevents the RPi from booting successfully. I mean to the point that the Ethernet LEDs never come on.
The other RTL-SDR dongle, also a v3 but a little older, still works but does not seem to be able to activate the bias-T voltage, so the amp acts like a 20-30 dB attenuator…
I’ve ordered two new SmartTee dongles, as they’re advertised to have “always on” bias-T, which for my particular purposes is satisfactory to me. Nonetheless, I’m curious as to why the one RTL died hard, and the other one doesn’t seem to respond to the commands from the above thread.
Thoughts?

Does the RTL2832U USB rtl-sdr work with DVB-C signals?

I can see from the website that it works with DVB-T but I cannot find anything about DVB-C. If not then can anyone recommend a USB stick that can decode DVB C signals for a Raspberry Pi?

submitted by /u/Competitive_Mongoose
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