[digitalradio] Re: CMSK successful tests on 600m
I just wish there was more activity down here on 600m! 73, Murray ZL1BPU --- In digitalradio@yahoogroups.com, Andy obrien wrote: > > Pretty impressive , Murray. Thanks for the update. > > Andy K3UK > > On Mon, Aug 30, 2010 at 6:34 PM, wrote: > > > > > > > I ran 200W of CMSK8 for two hours last night, with 100% copy at VK2DDI > > (2200km range) and good copy with very deep fades at ZL2AFP (500km range). > > Copy was good in VK2 well before sunset. > > > > Later in the evening a test with 50W of CMSK63 was also 100% copy for long > > periods at both locations. > > > > The transmissions were on 508.150kHz. I used a Redifon DU505 exciter. The > > transmitter is Class D H-bridge and the antenna a base loaded inverted L > > with 7.5m upwire, and three 30m top wires. > > > > Both receiving stations used PA0RDT mini-whip antennas. > > > > 73, > > Murray ZL1BPU > > > > > > R > > >
[digitalradio] CMSK successful tests on 600m
I ran 200W of CMSK8 for two hours last night, with 100% copy at VK2DDI (2200km range) and good copy with very deep fades at ZL2AFP (500km range). Copy was good in VK2 well before sunset. Later in the evening a test with 50W of CMSK63 was also 100% copy for long periods at both locations. The transmissions were on 508.150kHz. I used a Redifon DU505 exciter. The transmitter is Class D H-bridge and the antenna a base loaded inverted L with 7.5m upwire, and three 30m top wires. Both receiving stations used PA0RDT mini-whip antennas. 73, Murray ZL1BPU
[digitalradio] Re: CMSK63
I suggest you read the help file. All your points are answered there. Download the latest version. 73, Murray ZL1BPU --- In digitalradio@yahoogroups.com, "my_call_is_ac4m" wrote: > > I will be on 80m tonight using CMSK63 then switching to 31 after contact just > to see for myself how well this mode does under noisy conditions I will be > active on 3.587 tone frequency at 0100z but I have a few question does his > software have Macro commands like other software? And what is up with the > sample rate control? Is that for TX offsets? >
[digitalradio] Re: CMSK63
Hi folks, There seems to be a fair bit of misinformation around regarding the new CMSK mode for LF/MF. I recommend you go back to my web site, read all about it, download the latest version, then READ THE HELP FILE CAREFULLY. www.qsl/net/zl1bpu/CMSK/cmsk.htm The mode is not intended for HF, and I won't answer questions regarding its use there (use MFSK16 or DominoEX please!), but I am willing to respond to questions about its use on 2200, 600 or 160m. Pay particular attention to getting the sampling rate correct, especially on CMSK8, which is intended for beacon rather than QSO applications. You can expect it to take a while to get the tuning correct, and for text to appear, since the CMSK8 mode has long latency. This is a price you pay for narrow bandwidth and high sensitivity. Once documentation is complete, we'll offer the mode for inclusion in multi-mode software such as FLDIGI and HRD, but for now the features may seem a bit limited, and that's on purpose. 73, Murray ZL1BPU Co-designer, CMSK
[digitalradio] Using I&Q for digital modes.
Paul and others, Indeed you can generate Digital Modes as I&Q components from a sound card stereo output. I've been involved in a few successful trials. I believe there's I&Q PSK31 software about, I have an experimental I&Q version of DominoEX for use on LF, and there's a very nice I&Q output in DRM Dream, for transmitting 10kHz bandwidth DRM. It's the latter that I'm most familiar with. Grant ZL1WTT has built a couple of simple I&Q exciters (I have one) for 80m, using a ~14MHz crystal oscillator and Johnson Ring counter to generate the quadrature clocks. While it's difficult to generate much power with the linearity necessary for DRM, I have received Grant's 5W signal with enough S/N to recover very nice clean audio. I would guess that 10kHz wide DRM on 80m is not something you could do in the USA! The problems we have proceeding further with I&Q for digital modes can be summed up as three factors: 1. Insufficient software with I&Q transmit capability. I'd like to see it offered in all the popular software. 2. Complete lack of I&Q digital mode reception software. I&Q reception is at present limited to the Software Radio audio business. For digital modes we need the software to be both the receiver and the digital mode decoder - or use two sound cards. So far there's no I&Q software for digital mode reception (please prove me wrong!) Digital mode receiving software at present works only with audio or with 12kHz IF (such as DRM, although SDRadio will handle 12kHz IF). 3. You have to build your own gear. This will make the popularity of the approach much more limited. If we had the software, the idea would be more popular. By the way, the I&Q transceiver would be much more popular if there was also audio I&Q for voice input from a microphone - so you could also use your transceiver for SSB. 73, Murray ZL1BPU
[digitalradio] FCC to restrict BW of digital modes?
Folks, Given the recent discussion in the USA about restriction of audio subcarrier generated digital modes (i.e. most of them!) to 500Hz bandwidth, perhaps now is the time to remind you about - DominoEX DominoEX DominoEX DominoEX Yes, this super mode, which has all the advantages of MFSK16 with none of the disadvantages, meets these requirements easily at 16 baud (355Hz BW). DominoEX now sports FEC (same technique as MFSK16), and performance is within 2dB or so of MFSK16. The major advantages are improved tolerance of multi-path and Doppler effects, and the impressive tolerance of drift and poor tuning. DominoEX with FEC is now available in MultiPSK by Patrick F6CTE and a new alpha version of ZL2AFP DominoEX with soft decision decoding. This version is a small program which will operate on older slow laptops. Without FEC, DominoEX is also available in gMFSK. See www.qsl.net/zl1bpu/DOMINO 73, Murray ZL1BPU
[digitalradio] Mode Recognition
Patrick, I think that's a good idea, and useful for CQs - if people do't recognise the mode first time, the waterfall will tell them for next time you CQ is made. I also agree that an automatic recognition tool would be quite complex and would give little return unless it was an expensive commercial product. I wonder however whether there might be some manual technique, where the program offered a series of metrics, and a separate database: the user could (with appropriate guidance of course) use the tools to determine whether the mode was MFSK, PSK etc, and then measure the bandwidth and baud rate. From those you could put together a short list of appropriate modes by searching the database. I think you would need: 1. An FFT with spectrogram and long-term average spectrum display, to determine signal bandwidth, perhaps number of tones, and to serve as source for FSK baud rate measurement. 2. A phase scope measuring phase shift. 3. A correlator for baud rate measurement, either measuring from the FSK FFT or the PSK phasemeter. By the way, much of this is already available in SKYSWEEPER, not that I like the product for any other purpose than analysis. Any other suggestions? Murray ZL1BPU Patrick said: > In the last test version of Multipsk, I've added the following feature: each > transmission in a given mode will be prefixed by the name of the mode > transmitted in CMT Hell. I have dimensionned the name so as the mode will be > clearly visible on the waterfall. Yahoo! Groups Sponsor ~--> AIDS in India: A "lurking bomb." Click and help stop AIDS now. http://us.click.yahoo.com/VpTY2A/lzNLAA/yQLSAA/ELTolB/TM ~-> Need a Digital mode QSO? Connect to telnet://208.15.25.196/ Other areas of interest: The MixW Reflector : http://groups.yahoo.com/group/themixwgroup/ Looking for digital mode software? Check the quick commerical free link below http://www.obriensweb.com/digimodes.html Yahoo! Groups Links <*> To visit your group on the web, go to: http://groups.yahoo.com/group/digitalradio/ <*> To unsubscribe from this group, send an email to: [EMAIL PROTECTED] <*> Your use of Yahoo! Groups is subject to: http://docs.yahoo.com/info/terms/
[digitalradio] DominoEX - questions answered
Folks, If you want support for DominoEX, wnat to swap notes or have any questions answered, please post a message on the Yahoo MFSK Reflector. By posting only in one place, maximum use can be made of the support network, and it requires less work on the part of the development team. No official support will be provided for DominoEX on this Reflector. 73, Murray ZL1BPU Designer, DominoEX Yahoo! Groups Sponsor ~--> Get fast access to your favorite Yahoo! Groups. Make Yahoo! your home page http://us.click.yahoo.com/dpRU5A/wUILAA/yQLSAA/ELTolB/TM ~-> Need a Digital mode QSO? Connect to telnet://208.15.25.196/ Other areas of interest: The MixW Reflector : http://groups.yahoo.com/group/themixwgroup/ Looking for digital mode software? Check the quick commerical free link below http://www.obriensweb.com/digimodes.html Yahoo! Groups Links <*> To visit your group on the web, go to: http://groups.yahoo.com/group/digitalradio/ <*> To unsubscribe from this group, send an email to: [EMAIL PROTECTED] <*> Your use of Yahoo! Groups is subject to: http://docs.yahoo.com/info/terms/
[digitalradio] Domino EX stations off freq
--- In digitalradio@yahoogroups.com, "Joe Ivey" <[EMAIL PROTECTED]> wrote: > > I had the same thing here. I would have to adjust the waterfall between the two stations. This program will need a lot of work before it will make it. > > Joe > W4JSI > Joe, I suggest that it's the operators who need a lot of work, not the program! If in this day and age two stations can't net closer than 500Hz then you have to question their operating skills. The software will easily handle 200Hz offset without retuning, and how many other narrow modes do that? MFSK16 (which this mode will one day replace) requires a tuning accuracy of < 4Hz! Murray ZL1BPU Yahoo! Groups Sponsor ~--> 1.2 million kids a year are victims of human trafficking. Stop slavery. http://us.click.yahoo.com/WpTY2A/izNLAA/yQLSAA/ELTolB/TM ~-> Need a Digital mode QSO? Connect to telnet://208.15.25.196/ Other areas of interest: The MixW Reflector : http://groups.yahoo.com/group/themixwgroup/ Looking for digital mode software? Check the quick commerical free link below http://www.obriensweb.com/digimodes.html Yahoo! Groups Links <*> To visit your group on the web, go to: http://groups.yahoo.com/group/digitalradio/ <*> To unsubscribe from this group, send an email to: [EMAIL PROTECTED] <*> Your use of Yahoo! Groups is subject to: http://docs.yahoo.com/info/terms/
[digitalradio] Re: Domino EX
--- In digitalradio@yahoogroups.com, "F.R. Ashley" <[EMAIL PROTECTED]> wrote: > > Hi all, > > > Another question about Domino EX, is everyone going to use the default of 11baud, single space? No Buddy, I hope not! On 80m, especially early in the evening, you should use 8 baud. Those who complain that the mode is not very robust are not using the mode as it was intended. We routinely hold multi-way QSOs down here on 80m in the evening, using just a few watts and 100% copy all round over 500km distances. If you want support from the developers of DominoEX, please ask your questions on the MFSK Reflector. Murray ZL1BPU Yahoo! Groups Sponsor ~--> Get fast access to your favorite Yahoo! Groups. Make Yahoo! your home page http://us.click.yahoo.com/dpRU5A/wUILAA/yQLSAA/ELTolB/TM ~-> Need a Digital mode QSO? Connect to telnet://208.15.25.196/ Other areas of interest: The MixW Reflector : http://groups.yahoo.com/group/themixwgroup/ Looking for digital mode software? Check the quick commerical free link below http://www.obriensweb.com/digimodes.html Yahoo! Groups Links <*> To visit your group on the web, go to: http://groups.yahoo.com/group/digitalradio/ <*> To unsubscribe from this group, send an email to: [EMAIL PROTECTED] <*> Your use of Yahoo! Groups is subject to: http://docs.yahoo.com/info/terms/
[digitalradio] Re: DominaEX Side Bands
Technical enquiries and general support questions for DominoEX are only responded to on the yahoo MFSK Reflector. (But use the same sideband you would for SSB on all bands). Murray ZL1BPU Yahoo! Groups Sponsor ~--> Get fast access to your favorite Yahoo! Groups. Make Yahoo! your home page http://us.click.yahoo.com/dpRU5A/wUILAA/yQLSAA/ELTolB/TM ~-> Need a Digital mode QSO? Connect to telnet://208.15.25.196/ Other areas of interest: The MixW Reflector : http://groups.yahoo.com/group/themixwgroup/ Looking for digital mode software? Check the quick commerical free link below http://www.obriensweb.com/digimodes.html Yahoo! Groups Links <*> To visit your group on the web, go to: http://groups.yahoo.com/group/digitalradio/ <*> To unsubscribe from this group, send an email to: [EMAIL PROTECTED] <*> Your use of Yahoo! Groups is subject to: http://docs.yahoo.com/info/terms/
[digitalradio] Re: MFSK Mode Recognition
Jerry and Walt, I agree with you. My hearing's none the best either, and although I've learned to identify most of the modes by ear, it sure would be good to have some special software that would do it for you. I have been thinking along the lines of an analysis package based on the spectral profile and a correlator to discover the baud rate. In a way it would work in the same sort of way military software analysis sonar sounds or radar echoes. A database of existing modes would be used, which could be updated when new modes arrived. All we need is someone to put their hand up and take on the job! BTW, I remember the analysis tool for the PK232. It was slow, limited to FSK modes, and far from accurate. 73, Murray ZL1BPU Yahoo! Groups Sponsor ~--> Get fast access to your favorite Yahoo! Groups. Make Yahoo! your home page http://us.click.yahoo.com/dpRU5A/wUILAA/yQLSAA/ELTolB/TM ~-> Need a Digital mode QSO? Connect to telnet://208.15.25.196/ Other areas of interest: The MixW Reflector : http://groups.yahoo.com/group/themixwgroup/ Looking for digital mode software? Check the quick commerical free link below http://www.obriensweb.com/digimodes.html Yahoo! Groups Links <*> To visit your group on the web, go to: http://groups.yahoo.com/group/digitalradio/ <*> To unsubscribe from this group, send an email to: [EMAIL PROTECTED] <*> Your use of Yahoo! Groups is subject to: http://docs.yahoo.com/info/terms/
[digitalradio] MFSK Mode Recognition
Jerry, Open your ears! Don't rely on the waterfall as a means of recognition. Olivia type modes are hard to tell apart, admittedly, but the others are easy with a little experience. MFSK16 - narrow jumble of sound with an obvious lowest tone idle MFSK8 - slow musical jumble also with an obvious idle DOMINOEX - narrow jumble of sound with no idle, and several different speeds: determine the correct baud rate (a) using DominoEX software, or (b) by comparing the sound with local transmissions THROB - Demented flute duet: determine the baud rate by counting the throbs ALE - sounds like a turkey gobbling; the fastest of the MFSK modes OLIVIA - tones are widely spaced, and you should be able to hear this easily. The modes are also very wide. If you have the DominoEX software running, if the baud rate is correct you should also see (a) the sync operating correctly, and (b) the waterfall has sharp fine dots, not blurred. Murray ZL1BPU Yahoo! Groups Sponsor ~--> Get fast access to your favorite Yahoo! Groups. Make Yahoo! your home page http://us.click.yahoo.com/dpRU5A/wUILAA/yQLSAA/ELTolB/TM ~-> Need a Digital mode QSO? Connect to telnet://208.15.25.196/ Other areas of interest: The MixW Reflector : http://groups.yahoo.com/group/themixwgroup/ Looking for digital mode software? Check the quick commerical free link below http://www.obriensweb.com/digimodes.html Yahoo! Groups Links <*> To visit your group on the web, go to: http://groups.yahoo.com/group/digitalradio/ <*> To unsubscribe from this group, send an email to: [EMAIL PROTECTED] <*> Your use of Yahoo! Groups is subject to: http://docs.yahoo.com/info/terms/
[digitalradio] DominoEX Robustness
Rick KV9U wrote: "Without the FEC, it seems that the mode may not be very robust." It sounds to me as though the users you were monitoring were not operating at the correct speed. When used correctly, DominoEX is more robust than any other MFSK mode without FEC. Check the help information for advice. Yes, sure the new mode will be even better when the FEC option is added, but for now, assess its performance in comparison with other narrow non-corrected modes such as PSK31 and RTTY, and do so on bands where it was designed to be used. Technical support for the DominoEX mode is ONLY being provided on the Yahoo MFSK Reflector. Murray ZL1BPU Yahoo! Groups Sponsor ~--> Get fast access to your favorite Yahoo! Groups. Make Yahoo! your home page http://us.click.yahoo.com/dpRU5A/wUILAA/yQLSAA/ELTolB/TM ~-> Need a Digital mode QSO? Connect to telnet://208.15.25.196/ Other areas of interest: The MixW Reflector : http://groups.yahoo.com/group/themixwgroup/ Looking for digital mode software? Check the quick commerical free link below http://www.obriensweb.com/digimodes.html Yahoo! Groups Links <*> To visit your group on the web, go to: http://groups.yahoo.com/group/digitalradio/ <*> To unsubscribe from this group, send an email to: [EMAIL PROTECTED] <*> Your use of Yahoo! Groups is subject to: http://docs.yahoo.com/info/terms/
