osmocom-sdr

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904 discussions

Remote SDR# connection to Ham-It-Up HF Converter using RTL-SDR/TCP - Receiver is Deaf

by KD9GN

Happy New Year to Everyone .... I am thinking this may be more of an issue with rtl_tcp than with the client software (SDR#) so I thought I would throw this out there and see if anyone has any ideas. I have a Ham-it-Up up converter connected to an EZcap 668 (e4000) dongle and am using a random length long wire antenna all connected on a remote linux server (with minimal OS install) where I am running rtl_tcp. I am starting rtl_tcp using the following command: rtl_tcp -a 192.168.110.220 -p 1236 -d 2 When I connect to the remote dongle/converter using SDRSharp with RTL-USB/TCP I get nothing but static / noise. If I put the converter in bypass mode, then SDRSharp and my dongle perform with the typical performance I have experienced in the past. If I move the same dongle and up converter combo to the same pc running SDRSharp and connect to the dongle using RTL-SDR/USB I am able to receive many HF signals, as one would expect. For example, CHU Canada, WWV, some local CB radio chatter and even our local airport's LF beacon at 329 KHZ. I also tried starting rtl_tcp with the -g option and setting a gain to try to match the gain options available under RTL-SDR/USB but that had no effect. I am just wondering if I am not finding the correct settings so this will work or if this is an issue with rtl_tcp? BTW: I actually have two other Ezcap 668's running simultaneously on the remote linux server as device 0 / port 1234 and device 1 / port 1235 working just fine when connected to other remote instances of SDR Sharp. 73's - Dave KD9GN

12 years, 7 months

RTL2832

by ab ni

Hi, Does anyone technical documentations about RTL2832U ? soso

12 years, 7 months

Re: Direct sampling mode and rtl_xxx

by Sdr Guru

On Mon, Dec 31, 2012 at 2:02 AM, Alan Corey <alancorey(a)yahoo.com> wrote: > Some of them have a -R option for raw, I think that's what it does (rtl_fm > anyway). > This is a different topic. raw = no demodulation About "Direct sampling mode" https://groups.google.com/forum/#!topic/ultra-cheap-sdr/cG988R1D8uE SG > > Any documentation on this set of programs would be a good thing, other > than looking in the code or using --help. > > Alan > > > ----- > Radio Astronomy - the ultimate DX > > ------------------------------ > *From:* Sdr Guru <sdrguru1(a)gmail.com> > *To:* osmocom-sdr(a)lists.osmocom.org > *Sent:* Sunday, December 30, 2012 5:39 PM > *Subject:* Direct sampling mode and rtl_xxx > > Hi > > Is it possible to use rtl_fm, rtl_sdr and rtl_tcp in "Direct sampling > mode" > > SDR Guru > > > >

12 years, 7 months

rtl-sdr over multicast & multiple decoders

by James Sharp

I've been playing around with rtl-sdr as a way to stream trunking radio and air band traffic. I've done a bit of research and found people who are using multiple dongles, one to digest the control channel and one or more to tune and receive the voice channels as the talk groups come and go. They're also using multiple dongles and/or squelch scanning to stream airband signals Around here, all of the channels of the trunking system as well as all of the "interesting" fit inside the bandwidth of a dongle running at 3.6Msps. So, my question is this: Would it not be more efficient to have a single tuner dongle outputting all of its samples over multicast (or into a shared memory segment for that matter, if you want to stay on the same host) and then having a bunch of decoder processes listening to the samples and decoding what they need out of them?

12 years, 7 months

Direct sampling mode and rtl_xxx

by Sdr Guru

Hi Is it possible to use rtl_fm, rtl_sdr and rtl_tcp in "Direct sampling mode" SDR Guru

12 years, 7 months

decode raw

by Vitaliy Kulchevych

Hi, all! I want parse and decode raw data from my sdr device. I have RTL2832 based DVB-T receiver. I want get data from receiver via rtl-sdr sotware, parse and decode, and sent completed data through websocket to client in browser. Where I can find description of returning data from rtl_sdr, rtl_tcp. Specs, docs? Or what is the best way to do something like this my idea? Thanks! -- live free or die;

12 years, 7 months

Exceptionally Hard & Soft Meeting,exploring the frontiers of open source and DIY,Berlin, December 28-30 2012

by Andrea Montefusco

Maybe I lost some previous message, but I don't remember to have already seen that here. Anyway... From http://ehsm.eu/index.html: Harald Welte will present the Osmocom project he founded. In particular, there will be OsmocomBB, a free software GSM stack evolved enough to actually make phone calls and send SMS (plus all the possible explorations of the GSM system), and OsmoSDR, a small-size, low-cost software defined radio device. *am* --------------------------------------------------------- Andrea Montefusco iw0hdv http://www.montefusco.com tel: +393356992791 fax: +390623318709 ---------------------------------------------------------

12 years, 7 months

Information about the sampling rate of the RTLSDR driver

by frederic.evennou＠orange.com

Hello, I am testing a DVB-T USB key including the Elonics E4000 chipset and I want to check the sampling rate of this card. I set up the sampling rate at 2.048 Ms/s (rtlsdr_set_sample_rate), and my storing buffer is 8*1024 bytes, so I expect receiving 1024 I/Q samples every 500 microseconds. I am using the rtlsdr_read_async function to read the samples. Unfortunately the loop in my program indicates that 8*1024 bytes are read every 2 milliseconds. I am using the gettimeofday function to measure the time in microseconds. Does this result mean that the best I can do is to read some samples every 2 ms at 2.048 Ms/s. This would mean that I am missing 1.5 ms of signal. Is that correct or I am doing something wrong ? Thanks for your help. Frederic _________________________________________________________________________________________________________________________ Ce message et ses pieces jointes peuvent contenir des informations confidentielles ou privilegiees et ne doivent donc pas etre diffuses, exploites ou copies sans autorisation. Si vous avez recu ce message par erreur, veuillez le signaler a l'expediteur et le detruire ainsi que les pieces jointes. Les messages electroniques etant susceptibles d'alteration, France Telecom - Orange decline toute responsabilite si ce message a ete altere, deforme ou falsifie. Merci. This message and its attachments may contain confidential or privileged information that may be protected by law; they should not be distributed, used or copied without authorisation. If you have received this email in error, please notify the sender and delete this message and its attachments. As emails may be altered, France Telecom - Orange is not liable for messages that have been modified, changed or falsified. Thank you.

12 years, 7 months

Re: Update: New and improved airplane stuff

by Sdr Guru

On Fri, Dec 14, 2012 at 9:26 PM, Sdr Guru <sdrguru1(a)gmail.com> wrote: > On Tue, Dec 11, 2012 at 12:41 AM, keenerd <keenerd(a)gmail.com> wrote: > >> A few new features have been pushed in the last two days. >> >> Most significant is rtl_adsb, a fast and simple ADS-B decoder. It is >> not the most sensitive decoder (Prog's and rtl-1090 pick up a few more >> planes) but it works fairly well. Of course it lacks the interactive >> maps of other software, however the output can be piped into fancier >> programs or across the network with netcat. To use it, just run >> "rtl_adsb". It does not need any options and can pick up plenty of >> signals with only the stock antenna. >> >> > Hi Keener, > > nice work. > > Choosing between multiple devices (Windows7) is not working. > rtl_adsb.exe -d 1 > rtl_adsb.exe: invalid option -- d > > Thank you. It works now (Fedora). > I want to make a comparison between the E4000 and R820T. > > R820T produces 15% more packages than the E4000. Has anyone compared the rtl1090 and ADSB# ? http://sdrsharp.com/index.php/a-simple-and-cheap-ads-b-receiver-using-rtl-s… SDR Guru

12 years, 7 months

patch for rtl_tcp

by TAKAHASHI Tomohiro

Hi all, I'm new to this list. First, I want to say thank you to authors and contributors of this great work. I have set up a receiver server on Raspberry Pi with rtl_tcp, it seems it works good and can receive various signals with client gr-osmosdr on gnuradio or gqrx. But unfortunately I have encountered a trouble. I found rtl_tcp raise segv on reconnected from client. I investigated cause of segv and succeed to make a patch. Fixed rtl_tcp works good on raspberry pi(raspbian) and windows(mingw). I also make a startup script for debian/raspbian. I have push fixed code on github branch. https://github.com/edy555/rtl-sdr/tree/rtltcpFixSegv Please consider to pull this patch into original osmocom repo. Thanks, Tomohiro --- TT twitter: @edy555 blog: http://ttrftech.tumblr.com (in japanese)

12 years, 7 months

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