tag:blogger.com,1999:blog-5096278891763426276.post2089049746899718237..comments2024-03-28T18:37:12.987+02:00Comments on absorptions: Broadcast messages on the DARC sideOona Räisänenhttp://www.blogger.com/profile/08764440174916554983noreply@blogger.comBlogger31125tag:blogger.com,1999:blog-5096278891763426276.post-24823533383383938712021-04-11T17:07:40.135+03:002021-04-11T17:07:40.135+03:00Hmm. It seems that the HSL bus stop transmissions ...Hmm. It seems that the HSL bus stop transmissions have moved from Yle 1 to Me Naiset (91.1 MHz) and Radio Nova (106.2 MHz). I may have already discovered this in the past and forgotten, because it rings a bell.Rob Ghttps://rob.finoreply@blogger.comtag:blogger.com,1999:blog-5096278891763426276.post-37360026058416932802019-06-07T11:06:25.496+03:002019-06-07T11:06:25.496+03:00Hello Oona,
Do you know what DARC FM decoders and...Hello Oona,<br /><br />Do you know what DARC FM decoders and encoders are used for this (chips/modules)? For the end devices and for transmition encoders?<br /><br />BR, Ilya.Anonymousnoreply@blogger.comtag:blogger.com,1999:blog-5096278891763426276.post-3998584155263417592019-02-03T09:06:09.212+02:002019-02-03T09:06:09.212+02:00Thank you! I really try not to!Thank you! I really try not to!Oona Räisänenhttps://www.blogger.com/profile/08764440174916554983noreply@blogger.comtag:blogger.com,1999:blog-5096278891763426276.post-45289166049105349272019-02-01T14:24:24.598+02:002019-02-01T14:24:24.598+02:00Hello friend Oona Räisänen, I listened to your sou...Hello friend Oona Räisänen, I listened to your sounds and some what I liked, thank you for the audio materials, creative ideas, do not get bored, lose interest in life.Anonymousnoreply@blogger.comtag:blogger.com,1999:blog-5096278891763426276.post-44213614677155296302016-10-19T15:31:00.899+03:002016-10-19T15:31:00.899+03:00Thank You Oona,
this is what I failed exams in aro...Thank You Oona,<br />this is what I failed exams in around 1990/91 at Huddersfield Polytechnic in Yorkshire, England<br />doing a Degree in Electronic & Information Engineering<br /><br />This illustrates the purpose of it which we were never told<br />most teachers & lecturers don't explain the practical aspects for what to do in the future<br />e.g. in A-Level Chemistry and repetitive molecules in organic chemistry, if the teacher had said, 'it's working towards protein structure & DNA' then I would have understood<br /><br />I kind of understand FFT now & FSK and such<br />and I enjoy coding<br /><br />I was just researching RDS and came across DARC<br />Great Blog<br /><br />Damianhttp://www.manfirst.co.uknoreply@blogger.comtag:blogger.com,1999:blog-5096278891763426276.post-57267655401232175052015-12-08T15:02:02.265+02:002015-12-08T15:02:02.265+02:00the new RDS 2.0 standard is going to make use of s...the new RDS 2.0 standard is going to make use of subcarriers around 76khz, will the bus service have to be re-engineered?, great blog btwTim Bucknallhttps://www.blogger.com/profile/02418583507477745362noreply@blogger.comtag:blogger.com,1999:blog-5096278891763426276.post-80213764445059896622014-07-11T08:43:19.687+03:002014-07-11T08:43:19.687+03:00Yes, my noncoherent detector requires a low-noise ...Yes, my noncoherent detector requires a low-noise signal = bigger antenna with correct polarization.Oona Räisänenhttps://www.blogger.com/profile/08764440174916554983noreply@blogger.comtag:blogger.com,1999:blog-5096278891763426276.post-26258891338551945242014-07-09T22:25:57.032+03:002014-07-09T22:25:57.032+03:00Hi again! Here's an file, the signal is quite ...Hi again! Here's an file, the signal is quite noisy, and I couldn't verify that the DARC-channel is above the noise level since MPXtool shows at max to RDS. Hope you can scavenge data out of it, if not, I shall try to improve my receiving conditions, only a poor antenna was now used. http://www.modu.fi/snd/yle1kauhava.pcm (deep journalism can be heard...)moduhttps://www.blogger.com/profile/13833165783291596243noreply@blogger.comtag:blogger.com,1999:blog-5096278891763426276.post-16144288034619993272014-07-09T18:05:52.088+03:002014-07-09T18:05:52.088+03:00Oh man.. I think the Windows-version of rtl_fm is ...Oh man.. I think the Windows-version of rtl_fm is a bit crippled, since it doesn't provide a way to output to stdout, it outputs directly to a file and it's name is the PPM number without a suffix, but I will post here a suitable file, I need to examine the quality first.moduhttps://www.blogger.com/profile/13833165783291596243noreply@blogger.comtag:blogger.com,1999:blog-5096278891763426276.post-62215151044750262762014-07-09T00:10:56.738+03:002014-07-09T00:10:56.738+03:00rtl_fm -N -f 88.2M -l 0 -F -p 96 -s 180000 -g 25 &...rtl_fm -N -f 88.2M -l 0 -F -p 96 -s 180000 -g 25 > yle1kauhava.pcm<br /><br />replace numbers with local YLE1 frequency (-f) and your PPM error (-p)Oona Räisänenhttps://www.blogger.com/profile/08764440174916554983noreply@blogger.comtag:blogger.com,1999:blog-5096278891763426276.post-90092068411098125792014-07-08T22:22:57.769+03:002014-07-08T22:22:57.769+03:00Yeah, I just have to figure out how to capture the...Yeah, I just have to figure out how to capture the FM demodulated part (MPX) from RTL-SDR...moduhttps://www.blogger.com/profile/13833165783291596243noreply@blogger.comtag:blogger.com,1999:blog-5096278891763426276.post-87185005906933371002014-07-07T23:54:46.858+03:002014-07-07T23:54:46.858+03:00I'd love to have a few-minute recording of the...I'd love to have a few-minute recording of the local signal.Oona Räisänenhttps://www.blogger.com/profile/08764440174916554983noreply@blogger.comtag:blogger.com,1999:blog-5096278891763426276.post-58984561309538784142014-07-07T20:50:17.470+03:002014-07-07T20:50:17.470+03:00I have no idea of the data transmitted in the DARC...I have no idea of the data transmitted in the DARC channel, but according to my RTL-SDR readings, here in Kauhava, I am receiving the same 76k carrier with Yle Radio 1.. So would it be possible that it is national data channel, not regional since this supports the fact that it is present in every transmission of Radio 1?moduhttps://www.blogger.com/profile/13833165783291596243noreply@blogger.comtag:blogger.com,1999:blog-5096278891763426276.post-46746844253079617022014-06-18T13:43:05.630+03:002014-06-18T13:43:05.630+03:00The top screenshot is just FFT on the demodulated ...The top screenshot is just FFT on the demodulated FM signal. Everything else was pretty much done without baudline, using SoX and Perl.Oona Räisänenhttps://www.blogger.com/profile/08764440174916554983noreply@blogger.comtag:blogger.com,1999:blog-5096278891763426276.post-81170114840755313422014-03-15T20:33:18.037+02:002014-03-15T20:33:18.037+02:00Google for: noncoherent GMSK detectionGoogle for: noncoherent GMSK detectionOona Räisänenhttps://www.blogger.com/profile/08764440174916554983noreply@blogger.comtag:blogger.com,1999:blog-5096278891763426276.post-38319458566021275972014-03-15T13:01:18.727+02:002014-03-15T13:01:18.727+02:00but.. what about other two states?but.. what about other two states?SopaXTnoreply@blogger.comtag:blogger.com,1999:blog-5096278891763426276.post-40086135991442380112014-03-14T20:02:59.484+02:002014-03-14T20:02:59.484+02:00Both have 0 and 1Both have 0 and 1Oona Räisänenhttps://www.blogger.com/profile/08764440174916554983noreply@blogger.comtag:blogger.com,1999:blog-5096278891763426276.post-84941546430458506862014-03-14T14:48:36.751+02:002014-03-14T14:48:36.751+02:00Detecting L-MSK as binary FSK? how? L-MSK has 4 st...Detecting L-MSK as binary FSK? how? L-MSK has 4 states, FSK has only 2!Anonymousnoreply@blogger.comtag:blogger.com,1999:blog-5096278891763426276.post-24817318395439374782014-02-15T20:24:11.528+02:002014-02-15T20:24:11.528+02:00Oona, I saw your 30C3 talk, it was fantastic. Can ...Oona, I saw your 30C3 talk, it was fantastic. Can you please share any tips on which baudline channel/input mapping operations and transforms that you use when evaluating signals with data like this? I have been trying to become more familiar with using baudline, sox, inkscape, & perl as they seem to be your toolset of choice. <br /><br />Keep up the fantastic work & stay fluxy!Anonymousnoreply@blogger.comtag:blogger.com,1999:blog-5096278891763426276.post-56520294185546097362014-02-03T15:59:18.333+02:002014-02-03T15:59:18.333+02:00As a former broadcast engineer this is news to me!...As a former broadcast engineer this is news to me! All of my previous installs never tx'ed anything above 57KHz. It's nice to see the 4th harmonic being used for something useful.Anonymousnoreply@blogger.comtag:blogger.com,1999:blog-5096278891763426276.post-31023589697126186852013-11-29T08:18:54.462+02:002013-11-29T08:18:54.462+02:00Baudline.Baudline.Oona Räisänenhttps://www.blogger.com/profile/08764440174916554983noreply@blogger.comtag:blogger.com,1999:blog-5096278891763426276.post-48039828624015047312013-11-29T08:00:23.706+02:002013-11-29T08:00:23.706+02:00Found this on Hackaday and just wanted to say that...Found this on Hackaday and just wanted to say that you are AWESOME. I'm really jealous! I studied this stuff in school and thought it was super cool but never really played around with it. What are you using for the decoding? That is done in software right? (the filtering, splitting, mixing, comparing, etc). Any tips for those of us with technical knowledge of modulation schemes who'd like to play around with actual hardware?<br /><br />Again, really nice!Henry Thttps://www.blogger.com/profile/10834719808707381737noreply@blogger.comtag:blogger.com,1999:blog-5096278891763426276.post-79111259971331940052013-11-29T00:46:55.362+02:002013-11-29T00:46:55.362+02:00Hi!
What software used in the first picture?Hi!<br />What software used in the first picture?Anonymousnoreply@blogger.comtag:blogger.com,1999:blog-5096278891763426276.post-71666526331110383302013-11-25T22:11:32.055+02:002013-11-25T22:11:32.055+02:00The signal is injected at the transmitter site, no...The signal is injected at the transmitter site, not at the programme origin.Oona Räisänenhttps://www.blogger.com/profile/08764440174916554983noreply@blogger.comtag:blogger.com,1999:blog-5096278891763426276.post-18461625807319147962013-11-25T22:03:27.435+02:002013-11-25T22:03:27.435+02:00Why use YLE1 instead of a local Helsinki station f...Why use YLE1 instead of a local Helsinki station for transmission? Doesn't that prevent the rest of the country from using the same system (at least on YLE1)?Faureanhttps://www.blogger.com/profile/10629460047495160063noreply@blogger.com