Hello Dave, I do not know what you want to do with Linrad so I can not give a step by step procedure for how to set it up. Have a look at this page: http://www.sm5bsz.com/linuxdsp/usage/examples.htm Here are several examples for different purposes.
The setup for wideband hardware is explained in this QEX article: http://www.sm5bsz.com/linuxdsp/qex/040102qex020.pdf and the setup for using Linrad with an ordinary SSB transceiver is described here: http://www.sm5bsz.com/linuxdsp/qex/030910qex029.pdf There is also the Dubus article by Roger, W3SZ: http://www.nitehawk.com/w3sz/NEWSLinrad-2-2005FINAL.doc I do not think the Linrad user has any advantage from being a programmer. The difficulties you experience are related to basic physics/mathematics and good knowledge in electronics should be far more useful than programming skil. Since you say you have Linrad I guess you have tried to run it. What is the problem? Were you able to get to the main menu? Once there you will get into the soundcard setup when trying e.g. weak CW mode. The soundcard setup is actually building hardware (as seen from a system point of view) You must have knowledge about what bandwidth you are going to send into the soundcard and you have to set the sampling speed accordingly. If anything fails I expect you as well as everyone else to post a question to the Linrad mailing list. I actually do not think it will happen so I guess you sucessfully made the soundcard setup already and returned to the main menu. (Where you have to press W to not have to do it again) When you now press A (for weak CW) you get to the mode parameter setup. Just press enter for the default for everything. At this point you should have Linrad running. It should give normal receiver performance and it should allow you to play with various filters in the baseband. >From the main menu you can see that F1 gives you the keyboard commands. One of them is F1. Use it on the main processing screen or on the mode parameter screens to get information about what options you have. After reaching this far you might want to enable the AGC and start to investigate how to benefit from it. It should allow narrower filters on non-perfect signals although tracking signals down below the limit where you can copy anything implicates that you have to set a narrow bandwidth and therefore the time delay will increase. Finally you might want to calibrate your system to take full advantage of the noise blanker. To do that you need a pulse generator but for fundamental reasons it is not trivial at all if you want to do the calibration at VHF. A single pulse that has full energy up to 144 MHz has to be only about 3 nanoseconds in length. It does not help to make the amplitude high, your preamplifier will typically attenuate a 5V pulse quite a lot - it just saturates. There are (of course) ways around this problem and you will get step by step help if you put questions to the Linrad list. When you reached to the point where you do not see any obvious thing that indicates a problem, I would appreciate if you make a recording (Press 'S') some time when you hear a signal that you can not quite copy. Then listen to the file with Linrad, the result should be identical. By sending me the file and a screen dump (press 'G') and the parameres you were using I can reproduce your result exactly and I can suggest in what way I think you should make changes in case I think something is not optimum. 73 Leif / SM5BSZ > I have Linrad, I run Knoppix. I have no idea how to set Linrad up. I > have messed this for some time, with no success. My experience is > similar to that of Mike, W5UC, and I am no dummy in this area of > computers, as I have done my share of programming and computer > construction/modifications.The setup of LIinrad is just too complex > for me to take the time. We need from you, Lief, a step by step > procedure. It would be good for you to have someone as your assistant > who is a user rather than a programmer/developer, who.could write up > a clear procedure and present it in the step-by-step form. I feel > this is the only way most of us are going to be able to share in the > advantages of Linrad. > _______________________________________________ Winrad mailing list [email protected] http://winrad.org/mailman/listinfo/winrad_winrad.org
