osmocom-sdr

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912 discussions

RTL SDR LNAs
by Jonathan Rawlinson 23 May '13

23 May '13

Hello All This is the first time I have posted on this list, sorry if I have done it wrong I would like to use a line powered "cheap and nasty" LNA with an RTL dongle. E.g. http://www.amazon.co.uk/Satellite-Signal-Amplifier-Booster-electrosmart%C2%… This may seem a like stupid question (I will ask it anyway) but will the dongle need protecting from the 18V going down the antenna line. I have seen some diagrams with protection and some without. If protection is required, has anyone got any suggestions on how I should do it??? Many thanks Jonathan, M0ZJO

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osmosdr block
by laurent 22 May '13

22 May '13

Hi all, I need some help to resolve my problem with GNURADIO. I Built and installed rtl-sdr and it works well with the dongle terratec. Built and install also the osmosdr package, but when I open grc the block sources rtl does'nt appear. Any ideas? GNUradio for debian package v.3.5.3.2-1 installed. Best regards Laurent

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rtl_fm....external interface...any way?
by Favati 19 May '13

19 May '13

Hi there! I would like to know if is it possible to change the freq. of rtl_fm "on the fly" without cloning the process and restart it with a a different freq. parameter. Any idea?

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RTL-SDR component for REDHAWK SDR
by Michael Ihde 19 May '13

19 May '13

I've recently developed a RTL-SDR component for REDHAWK that uses the RTL-TCP server. https://github.com/Axios-Engineering/acquisition-components I'm guessing that this mailing list is the correct address to use for this component to be listed on the "Known Apps" page for the RTL driver. ~Michael

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FW: A question on osmoSDR new version
by LD Zhang 13 May '13

13 May '13

From: LD Zhang [mailto:ldz10565@gmail.com] Sent: Monday, May 13, 2013 2:23 PM To: 'osmocom-sdr(a)lists.osmocom.org' Subject: A question on osmoSDR new version Hello, I am very interested in the new osmoSDR that has 4MS/s rate and a 14bit ADC. Is this new version available for purchase? Thanks, LD

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Re: Raspberry Pi based remote SDR head
by Simon PurplePlaNET 13 May '13

13 May '13

Ah, OK - I've got you. You also need to run the script once you have launched rtl_tcp using the command in step 3) below. The simplest way to do this would be to add a step: 6) Sign in to rPi with a new terminal session, leaving the old one open for now. cd to the directory where you created the script and then run it using this command: ./rtl-robot (or whatever you called the script) You could run the script from the same terminal that you launched rtl_tcp from if you used & to force rtl_tcp to detach from the console and run in the background. I'll edit the comments on the script to make that a bit clearer... Thanks! Simon ----- Original Message ----- From: "Favati" <smile_k(a)libero.it> To: osmocom-sdr(a)lists.osmocom.org Sent: Saturday, 11 May, 2013 20:14:36 GMT +00:00 GMT Britain, Ireland, Portugal Subject: Re: Raspberry Pi based remote SDR head > Could you describe exactly the steps you have taken? 1) installed wiringpi (and tested as described on the developer site) 2) created your script 3) launched this command: stdbuf --output=0 rtl_tcp -a 192.168.2.15 -p 1234 > rtl.data 4) used sdrsharp to connect to my raspberry (192.168.2.15, and it connect ok, i can use sdrsharp ok) 5) nothing is displayed on the console of my raspy except the first 2 lines of rtl_tcp output The rtl_data is created ok and looking inside that file i can see the normal output of "rtl_tcp" (set freq blablablabla, etc...) At the moment i've taken another approach...i've patched the rtl_tcp.c to set the gpio directly...i'll post my "project" asap somewhere...

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Re: Raspberry Pi based remote SDR head
by Simon PurplePlaNET 11 May '13

11 May '13

Hi there, That's odd - do you have WiringPi installed? https://projects.drogon.net/raspberry-pi/wiringpi/download-and-install/ The script makes use of this excellent program to control the GPIO and also to report on the pin status. Originally I was using the native method of controlling the GPIO using export and echoing a value to the files on the pi. I stumbled onto WiringPi, which makes controlling the pins far simpler and does not require root privs to set them up. Simon ----- Original Message ----- From: "Favati" <smile_k(a)libero.it> To: osmocom-sdr(a)lists.osmocom.org Sent: Thursday, 9 May, 2013 18:30:51 GMT +00:00 GMT Britain, Ireland, Portugal Subject: Re: Raspberry Pi based remote SDR head Il 03/05/2013 01:57, Simon PurplePlaNET ha scritto: > Hi folks, > > I've been messing around with rtl_tcp and an RTL2832 device on a Raspberry Pi and want to add a bank of front end filters and a LNA that can be controlled by the GPIO. > > I want to allow manual control of the signal path via a web page hosted on the Pi, but also want to be able to have the filters selected automatically based on the frequency that the RTL device is tuned to. > > I noticed that rtl_tcp helpfully echos the frequency changes to the console, so I wrote a simple shell script to gather this data and control the GPIO. > > Somebody may have already done this and there is probably a better way to achieve it but, if this would be of any use to you, please feel free to copy and use as you wish. > > http://www.purpleplanet.org/?q=rtl-robot > > Cheers, > > Simon > > > Just tryed this command: stdbuf --output=0 rtl_tcp -a 192.168.2.15 -p 1234 > rtl.data I don't have anything connected to the gpio pins...but i cannot see any output from your script while changing freqs...(yes, i've gone below 100mhz and above 500mhz). It's quite strange....the rtl.data is created in the same folder of your script... Taking a look at rtl.data, it contains the correct output of the standard output of rtl_tcp. Any idea?

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Re: Raspberry Pi based remote SDR head
by Simon PurplePlaNET 10 May '13

10 May '13

Hi Alan, Where I live, the temperature extremes inside my attic are not so bad. If you look at devices such as the Kinetic SBS 3, you will see that Ethernet ports are becoming quite normal on SDR gear these days. This not only allows you to minimise the cable run to the antenna (important at 1090MHz) but also to use the device from anywhere with an adequate network connection to it. http://www.kinetic-avionics.com/ A 500 foot drum of RG-6 may only cost $32 at Home Depot, but you would need over 30,000 such drums to reach the closest Home Depot from my home. Quite an outlay when we already have the wealth of a global telecommunications industry at our fingertips and begging to be used! My main reason for doing this however, is really to make a better radio than the RTL dongle provides on it's own. I am interested in front end filtering and an LNA and want to use the rPi to control this. You could still run 500' of lossy co-ax to the antenna if you wanted to... :-) I could buy a Funcube Pro+ Dongle for £150 instead, but where is the fun in that? Simon ----- Original Message ----- From: "Alan Corey" <alancorey(a)yahoo.com> To: osmocom-sdr(a)lists.osmocom.org Sent: Friday, 10 May, 2013 03:39:55 GMT +00:00 GMT Britain, Ireland, Portugal Subject: Re: Raspberry Pi based remote SDR head To no one in particular: The usefulness of doing this escapes me. Sure you'd want to put the receiver up high, but in an attic? There are all kinds of temperature extremes up there, from very hot most of the year to below freezing in colder climates in the winter. Something like a 1-transistor preamp feeding some RG-6 seems like a more practical solution. You can buy 500 feet of RG-6 for about $32 at Home Depot and good low-noise transistors are available under $1. You just need enough gain to offset the cable loss and RG-6 is pretty good. Alan ----- Radio Astronomy - the ultimate DX --- On Thu, 5/2/13, Simon PurplePlaNET <simon(a)purpleplanet.org> wrote: From: Simon PurplePlaNET <simon(a)purpleplanet.org> Subject: Raspberry Pi based remote SDR head To: osmocom-sdr(a)lists.osmocom.org Date: Thursday, May 2, 2013, 7:57 PM Hi folks, I've been messing around with rtl_tcp and an RTL2832 device on a Raspberry Pi and want to add a bank of front end filters and a LNA that can be controlled by the GPIO. I want to allow manual control of the signal path via a web page hosted on the Pi, but also want to be able to have the filters selected automatically based on the frequency that the RTL device is tuned to. I noticed that rtl_tcp helpfully echos the frequency changes to the console, so I wrote a simple shell script to gather this data and control the GPIO. Somebody may have already done this and there is probably a better way to achieve it but, if this would be of any use to you, please feel free to copy and use as you wish. http://www.purpleplanet.org/?q=rtl-robot Cheers, Simon

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Raspberry Pi based remote SDR head
by Simon PurplePlaNET 10 May '13

10 May '13

Hi folks, I've been messing around with rtl_tcp and an RTL2832 device on a Raspberry Pi and want to add a bank of front end filters and a LNA that can be controlled by the GPIO. I want to allow manual control of the signal path via a web page hosted on the Pi, but also want to be able to have the filters selected automatically based on the frequency that the RTL device is tuned to. I noticed that rtl_tcp helpfully echos the frequency changes to the console, so I wrote a simple shell script to gather this data and control the GPIO. Somebody may have already done this and there is probably a better way to achieve it but, if this would be of any use to you, please feel free to copy and use as you wish. http://www.purpleplanet.org/?q=rtl-robot Cheers, Simon

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Confirmation that the QuadDVBT works
by Myles Eftos 10 May '13

10 May '13

Hello, I just wanted to let you guys know that the Digital Now Quad DVB-T Receiver (http://digitalnow.com.au/product_pages/Quad.html) works. It's a PCI-e card with 4 tuners on it, linked up internally via USB. This has pleased me no-end - I might finally be able to get DAB+ working on my media centre! I had to add the following line to librtlsdr.c { 0x0413, 0x6680, "QuadDVBT" } Do I need to let anyone else know? Thanks! ---------------------------------------------- Myles Eftos Mobile: +61-409-293-183 MadPilot Productions - Created to be Different URL: http://www.madpilot.com.au Phone: +618-9227-5616 Fax: +618-9467-6289 Try our time tracking system: 88 Miles! http://www.88miles.net

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