Архив за 17.01.2018

RTL-SDR Discussion • Re: How to identify multiple RTL-SDR sticks in one computer?

I'm running Ubuntu with 5 dongles.
rtl_eeprom -s ............give each a new ser # .....number your case too so you can see it when plugged in.
The last inserted usb dongle always fills into -d 0 .......for me....
They seem to stay the same place until you add another unit.....then it takes -d 0 and everybody moves down.
I start them up in rc.local

Statistics: Posted by tim_rtd — Wed Jan 17, 2018 11:24 pm


Comment on Leif Compares the Airspy HF+ with the Airspy+Spyverter Combo by Drone

@Ken C, You said: “…the only peeve with airspyhf is the antenna sma jack is soldiered directly to the board, they should have used a short jumper wire like the SDRPlay has done, then when somebody has to tighten the nut on the antenna jack it does not break the soldier on the board…”

Just use a short SMA coax jumper to the radio connector to relieve strain. Never connect/re-connect directly to the radio’s built-in connector. This is OK for a radio like this which targets HF/VHF only. Just make sure you buy/build a quality jumper (beware of the Chinese stuff out there).

RTL-SDR Discussion • How to identify multiple RTL-SDR sticks in one computer?

Hi all,

I've been using multiple USRPs with one computer for many years - they're easy to differentiate as they each have a serial number that is specified when opening the device - so you always know which radio your software is talking to.

With the RTL-SDR sticks that's a different story unfortunately. They all appear to have the same serial number: <lots of zeroes followed by a single 1>. I need to make sure that my programs each know which stick they're talking to. This is because each stick has a slightly different frequency offset that needs to be compensated for. I also have different antenna inputs depending on what each stick does.

Imagine I run an AIS and an ADS-B decoder on the same machine at the same time. One stick has a VHF antenna for AIS, the other a stubby 1090 MHz stick. I need to make sure dump1090 is always talking to the stick with the ADS-B antenna, and ais_rx always to the VHF antenna equipped stick.

I can do this by passing rtl=0 or rtl=1 parameters, but this device enumeration appears random, I don't think I have any guarantee that the order won't change in the future or on next reboot.

I'm running on Linux, if it makes a difference.

Cheers

- Balthasar

Statistics: Posted by zeedoktor — Wed Jan 17, 2018 9:49 pm


Listening to DMR on the Rasperry Pi3 with op25 and a SDR

Listening to DMR on the Rasperry Pi3 with op25 and a SDR submitted by /u/sanjurjo
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RTL-SDR Discussion • Re: SDR Internet

Thank you Tim.

Statistics: Posted by ILSAPP — Wed Jan 17, 2018 8:32 pm


Getting started with SDR# and could use some help

I am using a Mac with the RTL-SDR dongle. GQRX works fine but I wanted to try SDR#. I am running it under Windows 10 under Parallels (on a Macbook Pro 2.9Ghz i5). I thought I would start by just getting FM commercial radio but the audio I am getting is very distorted. Here is a link to a small sample https://we.tl/AIblFnpmcl. Do I have an incorrect setting or could the processor be too slow or ...?

submitted by /u/Ihf
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RTL-SDR Discussion • SDR Development

Hello,

is it possible to develope my own SDR Programm?
I can't found any SDK's or Frameworks.
I prefer C#

Can anyone help me?

With regards Daniel

Statistics: Posted by DanielZ — Wed Jan 17, 2018 8:07 pm


RTL-SDR Discussion • Re: SDR Internet

Look up Websdr, go to Twente.

Statistics: Posted by tim_rtd — Wed Jan 17, 2018 7:44 pm


Troubleshooting Help • Re: RTL-SDR will not recognise selected Source

An update to the above:-
Now I cannot even install SDRSharp. Plane Spotter is also not even trying. Dump1090 is running but nowt else. Think I'l go back to my Bearcat UBC355CLT scanner!

Statistics: Posted by rifleman49 — Wed Jan 17, 2018 7:31 pm


я сейчас смотрю даташит на АЦП AD876 , вот его бы в свисток вместо второго чипа.. 10 бит, 20 Msps, 4$ всего цена. Выход …

killer258 пишет:
я сейчас смотрю даташит на АЦП AD876 , вот его бы в свисток вместо второго чипа.. 10 бит, 20 Msps, 4$ всего цена. Выход отсчётов идёт в параллельном коде,причём сразу после подачи питания и...
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Широкополосный приёмник из DVB донгла - Страница #537

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