[linrad] Re: Linrad-02.39
Hello Francesco and Roger, Hello Leif i guess that Ermanno, IK7EZN has already tolt you, regarding the bug that i found on last 02.39 release. It's a minor bug, because all the rest seems to work properly. When i try to change the freq. trough the arrows all crashes. Otherwise if i do it, just writing by hand all is ok. I do not remember when I corrected this (and for what reason) but this bug is not present in the current 02.40pre version that Ermanno just tested. I attach my response to Ermannos test report because I will not have the time to fix 2) and the inconvenience of 3) will be present in Linrad-02.40 which I will upload before I leave. 73 Leif - Hi Ermanno, 1- The change of frequency is OK with Linrad-pre40 in Windows and Linux. Good:-) 2- In windows has disappared the choise 4 from radio menu' (see immage) Oooh! I changed the way the soundcard is opened when 16 bit input is selected to allow use under Windows Vista. Please try to open a second device to get four audio channels. Please, try also to open in 32 bit format - then it should be as before. I can automate the open process, but I need someone who has Vista to verify. No time before I leave. 3- Compilation with users_hwaredriver go in error (see immage) The new transmit routines have forced me to make several changes in the WSE control. Please check users.c or users_tr.c and copy the WSE routines from there. Sorry for the inconvenience, unfortunately it may happen again - next step in development when I return home is Rx/Tx timing for QSK and RADAR. May need some more changes in hardware related stuff 4- I have tried calibrazion routine and i have attach the immages. What is in the last screen Max correction ch0? and because the values of low and hight are inverted ? Pulse generator was in input at 10.7 wse. Try some bad filter shapes: M for parabolic shape E to increase steepness C or D to move the function off center. Then it should become clear what 'Max correction' is. It is the maximum of the yellow curve at the two sides. (Low and high means left and right on screen, that is how frequency is defined here.) 73 Leif # This message is sent to you because you are subscribed to the mailing list linrad@antennspecialisten.se. To unsubscribe, E-mail to: [EMAIL PROTECTED] To switch to the DIGEST mode, E-mail to [EMAIL PROTECTED] To switch to the INDEX mode, E-mail to [EMAIL PROTECTED] Send administrative queries to [EMAIL PROTECTED]
[linrad] Re: Linrad-02.39
Hi Leif, Thanks very much for the new calibration and automatic spur removal functions. Fantastic! There is now a new page about calibration in Linrad: http://www.sm5bsz.com/linuxdsp/flat/ampcal.htm The links to the data files (blinkerinitx.xxx) are broken (but I found them anyway :-)). One small issue, in windows, adfile is selected instead of adfile.txt (assuming both are present). I have not had much feed-back on whether the changes in users.c and users_tr.c have caused problems or if there have been other I have not tried the transmit function, but have noticed no problems in other functions so far. I have Linrad and MAP65 running on the same computer under windows. I am using windows remote connect on a second comuter to display and control MAP65 as it runs on the first computer. Amazing combination. I can now copy signals that were buried under local noise before. Now to get the transmit side working and make some EME contacts! I am still looking for interesting interference situations. You may have seen Reserved for blanker in the baseband graph. This is a routine that should help against lightening crashes on HF bands and perhaps in other situations where interference pulses are not local and therefore suffer from multi-path propagation. Is there NOBODY on this list who ever tries to copy a signal but has big difficulties due to interference of some kind (or in SSB has a too low S/N) ??? I am very interested in recordings of marginal copy or no copy in CW or SSB. Maybe DSP could improve :-) I'll try and find some files for you to work on. I'm pretty sure various low banders have samples out on the web of signals fading in and out of the noise (complete with static crashes, powerline noise, electric fences, plasma TV buzz, ethernet birdies, etc.). I'll make a recording of my 144 MHz environment that will be a real challenge! Another one of my interests is low band (160/80 meters) where my noise level is very high. I have been thinking about installing a 4 square receive antenna system similar to the DX Engineering system ( http://www.dxengineering.com/ ) or perhaps the 2 antenna version with the NCC-1 noise cancelling unit. It seems to me that the primary functions of these units (controlling the position of the main lobe of the 4 square and/or noise cancelling) would be better accomplished in DSP (certainly cheaper). I was thinking about using four 160/80 meter softrocks (one for each antenna with common sampling clock) and feeding the I/Q output of each softrock into one channel of a D44 sampling at 96KHz. That (I think) would result in ~48 KHz sampled bandwidth (which may not be wide enough for very effective noise blanking) and the softrocks probably aren't the best frontends, but it would be a very interesting (cheap) experiment. Are these functions (antenna beam forming and noise cancelling) something Linrad could accommodate? :-) Thanks again 73 joe n6kk # This message is sent to you because you are subscribed to the mailing list linrad@antennspecialisten.se. To unsubscribe, E-mail to: [EMAIL PROTECTED] To switch to the DIGEST mode, E-mail to [EMAIL PROTECTED] To switch to the INDEX mode, E-mail to [EMAIL PROTECTED] Send administrative queries to [EMAIL PROTECTED]
[linrad] Re: Linrad-02.39
Hi Joe, The links to the data files (blinkerinitx.xxx) are broken (but I found them anyway :-)). Thanks for telling me. I have corrected the links (hopefully) One small issue, in windows, adfile is selected instead of adfile.txt (assuming both are present). Yes. I do not remember why i made it that way, but there must have been some reason... Linrad always looks for adfile first, then adfile.txt if adfile was not present. For some unknown reason the Linux adfile seems to work under Windows. I have not tried the transmit function, but have noticed no problems in other functions so far. Good:-) The transmit side is not complete, and I do not think I will have the hardware to test it this year.. I'll try and find some files for you to work on. I'm pretty sure various low banders have samples out on the web of signals fading in and out of the noise (complete with static crashes, powerline noise, electric fences, plasma TV buzz, ethernet birdies, etc.). I'll make a recording of my 144 MHz environment that will be a real challenge! The problem (to me) is that low banders record their data on un-calibrated systems and that may cause the problem to look more difficult than it really is Another one of my interests is low band (160/80 meters) where my noise level is very high. I have been thinking about installing a 4 square receive antenna system similar to the DX Engineering system ( http://www.dxengineering.com/ ) or perhaps the 2 antenna version with the NCC-1 noise cancelling unit. It seems to me that the primary functions of these units (controlling the position of the main lobe of the 4 square and/or noise cancelling) would be better accomplished in DSP (certainly cheaper). I was thinking about using four 160/80 meter softrocks (one for each antenna with common sampling clock) and feeding the I/Q output of each softrock into one channel of a D44 sampling at 96KHz. That (I think) would result in ~48 KHz sampled bandwidth (which may not be wide enough for very effective noise blanking) and the softrocks probably aren't the best frontends, but it would be a very interesting (cheap) experiment. Are these functions (antenna beam forming and noise cancelling) something Linrad could accommodate? :- With four softrocks you would need 8 analog inputs so a Delta44 would be inadequate. There is the Delta 8?, an 8-channel version. The hardware we should look for is something using a good VHF-sampling A/D like the LTC Linrad is currently limited to two channels. In principle it could be adopted to any number of RF channels that you want to supply. At the moment Linrad only optimizes for maximum signal when Linrad is to adjust the polarization parameters. In a multi-antenna situation it would be better to optimize for optimum S/N. Surely possible, but I do not have the hardware to play with such things. What we should look for is digital hardware with LTC2207 or similar to sample at VHF (with proper randomization.) We also need something to put into a PC to receive and down-convert tha data from any number of such units. Technically this should be quite straight-forward, but I do not have the skils to do this developement. To start with, you might use a Delta 44 and two softrocks with the current Linrad software. You may use the manual polarization setting to cancel undesired signals, but you could also allow Linrad to optimize the signal level for the interference while you listen in the orthogonal channel where the interference would be minimized. Maybe you will be able to produce interesting files. 73 Leif / SM5BSZ # This message is sent to you because you are subscribed to the mailing list linrad@antennspecialisten.se. To unsubscribe, E-mail to: [EMAIL PROTECTED] To switch to the DIGEST mode, E-mail to [EMAIL PROTECTED] To switch to the INDEX mode, E-mail to [EMAIL PROTECTED] Send administrative queries to [EMAIL PROTECTED]
[linrad] Re: Linrad-02.39
Hi Leif, The problem (to me) is that low banders record their data on un-calibrated systems and that may cause the problem to look more difficult than it really is Another problem is the files are probably low bandwidth, 3-4 KHz audio files. And almost certainly uncalibrated. With four softrocks you would need 8 analog inputs so a Delta44 would be inadequate. There is the Delta 8?, an 8-channel version. The hardware we should look for is something using a good VHF-sampling A/D like the LTC I believe it is possible to sync two D44s together, but I haven't looked into it. The HPSDR Mercury board should be interesting when it becomes available (http://hpsdr.org/wiki/index.php?title=MERCURY) . To start with, you might use a Delta 44 and two softrocks with the current Linrad software. You may use the manual polarization setting to cancel undesired signals, but you could also allow Linrad to optimize the signal level for the interference while you listen in the orthogonal channel where the interference would be minimized. Sounds interesting. I'll give it a try when I get a chance. 73 joe n6kk # This message is sent to you because you are subscribed to the mailing list linrad@antennspecialisten.se. To unsubscribe, E-mail to: [EMAIL PROTECTED] To switch to the DIGEST mode, E-mail to [EMAIL PROTECTED] To switch to the INDEX mode, E-mail to [EMAIL PROTECTED] Send administrative queries to [EMAIL PROTECTED]
[linrad] Re: Linrad-02.39 and Linrad-MAP65
Hi Roger, I have been playing with Linrad and MAP65 and have made several EME contacts this way. It is a lot of fun, and truly amazing. MAP65 finds stations that I do not see on the waterfall with my usual [aggressive] parameters! This worries me a lot. I know you mentioned this before and I have been worried ever since. It would be interesting to have a file that contains an example. It should last at least 4 minutes so one can see the 1 minute on/off pattern of JT65 to distinguish from all the spurs that are likely to be present. I would like to be able to specify which of the two network cards in my Linrad computer is the one that Linrad uses to send the data to the MAP65 computer, as that way I will not tie up my network by blasting it with the multicast and won't have to disconnect this computer from the network each time I want to use Linrad and MAP65. Is doing this as simple as specifying sin_addr [which I found in network.c} somewhere? I really do not know, but I have a feeling that this has to be done outside Linrad with a network tool of some kind. I hope someone else will know better:-) 73 Leif / SM5BSZ # This message is sent to you because you are subscribed to the mailing list linrad@antennspecialisten.se. To unsubscribe, E-mail to: [EMAIL PROTECTED] To switch to the DIGEST mode, E-mail to [EMAIL PROTECTED] To switch to the INDEX mode, E-mail to [EMAIL PROTECTED] Send administrative queries to [EMAIL PROTECTED]
[linrad] Re: Linrad-02.39 and Linrad-MAP65
Hi Leif, I would not worry. I assume that it means that I haven't set my parameters optimally, or that I have so many birdies that they are hiding under a birdie or mistaken for one. I just thought it was 'cool'; kind of like finding a station when tuning an old fashioned radio with knobs on a band that you thought was 'dead' ;) I have had such good experience with Linrad that I have never sat down to learn the theory and optimize things for my particular setting. The 'defaults' do very well for me, and I just do a little tweaking without as much thought as I should put into things. SO if you must worry, worry about my IQ deficiency or my curiosity deficiency and not a Linrad deficiency ;) OK on the second question. I thought the address of the NIC to be used was something easy to change in the Linrad code. Knowing its not, I will delve into how these things are handled by the OS and see what I can do [unless someone pipes up with the answer and saves me the trouble] ;) Thanks again for all, and 73, W3SZ Roger Rehr http://www.nitehawk.com/w3sz Quoting Leif Asbrink [EMAIL PROTECTED]: Hi Roger, I have been playing with Linrad and MAP65 and have made several EME contacts this way. It is a lot of fun, and truly amazing. MAP65 finds stations that I do not see on the waterfall with my usual [aggressive] parameters! This worries me a lot. I know you mentioned this before and I have been worried ever since. It would be interesting to have a file that contains an example. It should last at least 4 minutes so one can see the 1 minute on/off pattern of JT65 to distinguish from all the spurs that are likely to be present. I would like to be able to specify which of the two network cards in my Linrad computer is the one that Linrad uses to send the data to the MAP65 computer, as that way I will not tie up my network by blasting it with the multicast and won't have to disconnect this computer from the network each time I want to use Linrad and MAP65. Is doing this as simple as specifying sin_addr [which I found in network.c} somewhere? I really do not know, but I have a feeling that this has to be done outside Linrad with a network tool of some kind. I hope someone else will know better:-) 73 Leif / SM5BSZ # This message is sent to you because you are subscribed to the mailing list linrad@antennspecialisten.se. To unsubscribe, E-mail to: [EMAIL PROTECTED] To switch to the DIGEST mode, E-mail to [EMAIL PROTECTED] To switch to the INDEX mode, E-mail to [EMAIL PROTECTED] Send administrative queries to [EMAIL PROTECTED] Roger Rehr W3SZ http://www.nitehawk.com/w3sz # This message is sent to you because you are subscribed to the mailing list linrad@antennspecialisten.se. To unsubscribe, E-mail to: [EMAIL PROTECTED] To switch to the DIGEST mode, E-mail to [EMAIL PROTECTED] To switch to the INDEX mode, E-mail to [EMAIL PROTECTED] Send administrative queries to [EMAIL PROTECTED]
[linrad] Re: Linrad-02.39 and Linrad-MAP65
Hello all , I think that if we need LINRAD and MAP65 to gain popularity , we need some RX hardware. Something less expensive than Leif's hardware , but better than Time Machine , anybody working on this? 73 Dom # This message is sent to you because you are subscribed to the mailing list linrad@antennspecialisten.se. To unsubscribe, E-mail to: [EMAIL PROTECTED] To switch to the DIGEST mode, E-mail to [EMAIL PROTECTED] To switch to the INDEX mode, E-mail to [EMAIL PROTECTED] Send administrative queries to [EMAIL PROTECTED]
