[digitalradio] Success ! QSOs with two new digital modes
Over the past 24 hours, I have had two successful QSO on two new digital modes, new modes for me. Last evening I had a QSO on 6 meters (my first non-repeater contact on 6M) using JT6M, I worked N4HN in North Carolina and then today on 6M I worked Bruce N5SIX using FSK441. I am currently using just a 2 element 6M Yagi 90 watts, antenna at the moment just 15 feet high. I think working digital via meteor scatter or even sporadic E may appeal to some of the digital enthusiasts here , I urge you to give it a try. I think it will appeal to those that just like trying things, testing signal paths, and general experimentation. It is NOT for those that like a rag-chew. The N5SIX QSO I had took an hour to complete. Bruce N5SIX has been most helpful in teaching me the basics of JT65A operations so I was determine to make a Good go of giving him a new grid square on MS. If you had told em that I would actually enjoy a mode that took an hour to complete a basic exchange, I would have told you that you were crazy. However, there is something challenging and exciting about looking at the waterfall for a tell-tale meteor scatter signal spike, and then fishing around in the WSJT graphical display for the decoded text. While an hour may not be unusual, I have been told that with good conditions 15 minutes is not too uncommon for successful contacts. . Regardless of meteor scatter or not, it seems that the JT6M and FSK441 modes with the WSJT software might be very useful for detecting very brief 6M and 2M Sporadic E openings For example, using FSK441 mode today 125600 18.4 280 3 26 -21 R26 R26 R26 R26 R26 R26 R26 R26 R26 R26 The above prefect copy string occurred out of a very brief ping . One long burst produced time width 132100 1.6 14805 36 -21 26 UK R26 UK R26 UK R26 UK R26 UK R26 UK 132100 3.1 80 2 16 -21 RR6 UH 263UK2 132100 5.2 1003 16 -21 RR RRRORRRORR RS 132100 6.1 60 2 16 -21 RR RRR RR 132100 6.3 1403 26 -21 RR RRR RRR RRR RRR RRR 132100 8.3 1202 26 -21 R RRR RRR RJR R V So in a few brief seconds, the info can get through. So, if you are game for some new modes, give this a try! Andy K3UK Skype Me : callto://andyobrien73 www.obriensweb.com
Re: [digitalradio] WinDRM Digital Voice
It would be difficult to pause without notice with DV due to the latency issue. This is one of the reasons that I do not expect DV to ever become all that popular on HF. And if there are attempts to improve the sensitivity and robustness, the latency would have to become even more noticeable since I doubt that there is any chance to have wider bandwidth modes such as you have on VHF and up with over 6 kHz wide signals. Latency can be acceptable for text modes, but much more problematic with voice. DV does not really lend itself to fast break in technique such as used on net operation or quick round tables where individuals make rapid back and forth comments. Without some major breakthrough, which at this time seems unlikely to contravene the laws of physics, HF DV seems destined as a niche player, similar to the way AM is still used. I have been getting a bit concerned with some of the strong statements being made lately by some of the more overzealous proponents of digital. Based upon the Dayton Hamvention Digital Forum presentations, it is getting a bit much, with claims that digital technology is destined to replace most analog technology. Because of the many downsides to digital technology, this is most unlikely on HF. It may eventually become more popular on VHF and higher frequencies due to the allowance of wider bandwidth modes. There are good uses for digital and there are good uses for analog and one is not always the best choice over the other. 73, Rick, KV9U kd4e wrote: Couldn't DV include a automated brief pause every 1 or 2 min to check for doubling? It would be so brief as to be almost indiscernible to the op and would trigger a warning of some sort only if doubling (defined by certain parameters) were detected. WDYT?
[digitalradio] Re: WinDRM Digital Voice
Rick KV9U wrote: This is one of the reasons that I do not expect DV to ever become all that popular on HF. ... since I doubt that there is any chance to have wider bandwidth modes such as you have on VHF and up with over 6 kHz wide signals. Hi Rick, In USA, there is currently no bandwidth limit for a digital voice signal on HF. Bonnie KQ6XA
Re: [digitalradio] WinDRM Digital Voice
At 11:47 AM 5/13/2007, you wrote in part: This is one of the reasons that I do not expect DV to ever become all that popular on HF. It is doing very well at this time.
Re: [digitalradio] Re: WinDRM Digital Voice
If a short wave station is intefering, constantly, with licensed operations in another part of the world, they are not following international regulations to the letter. First, SWBC stations may NOT direct their signals to an area of the world wherein that frequency is assigned to other uses (I.E. ham radio), according to ITU regulations. The problem comes in that when they are running millions of watts, the front to back ratio, even if what would be considered a great front to back figure - the reverses direction still is thousands of watts. Second, and at least in the past; many countries did not obligate their own stations from followng the rules. We do NOT have to tolerate such action. If that happens, we have every right to expect our own FCC and the ITU to make direct complaints to said countries. They are not always successful, but in many case they have been able to convince the foreign governments to ineed step in and do something about the inteference. That said, we do NOT have to put up with it on the ham bands. Again we have every right to insist the FCC shut down any amateur operation that would intefere with assigned amateur bands and other mode operations within them. It all comes down to proper operating practices. Danny Douglas N7DC ex WN5QMX ET2US WA5UKR ET3USA SV0WPP VS6DD N7DC/YV5 G5CTB all DX 2-6 years each . QSL LOTW-buro- direct As courtesy I upload to eQSL but if you use that - also pls upload to LOTW or hard card. moderator [EMAIL PROTECTED] moderator http://groups.yahoo.com/group/DXandTalk - Original Message - From: [EMAIL PROTECTED] To: digitalradio@yahoogroups.com Sent: Sunday, May 13, 2007 5:40 PM Subject: Re: [digitalradio] Re: WinDRM Digital Voice Most hams want to do the right thing when it comes to operating on our very limited frequencies. That means keeping our signals as narrow as we possibly can to reduce interference to others. The FCC rules state that we should operate with good amateur practices and have also said that
[digitalradio] Flushing buffer ?
Hi Gang, Got a strange one for you - If there is text left to be transmitted, the program will send all except the last word, no matter how long or short the message may be, until I hit Enter again. This happens not only with MixW but also IZ8BLY's Hellschrieber so can't blame the software. I did observe however that DigiPan did not have the problem. The computer is running Windows 98 but only has 28MB RAM, used to have more (has Alzheimer's) and when it did I didn't have the problem so assume it's related lack of memory (just like me). Thanks, Jerry - W6LQR
Re: [digitalradio] Re: WinDRM Digital Voice
Guys let's not start yet another rant on bandwidth. All Bonnie was pointing out was that there is no limit on DV at this time. I really don't think anyone would run anything wider that a SSB signal anyway. John, W0JAB Your (trying to be) friendly moderator
[digitalradio] HF Digital Voice repeaters Re: WinDRM Digital Voice
mrfarm Rick wrote Most hams want to do the right thing when it comes to operating on our very limited frequencies. That means keeping our signals as narrow as we possibly can to reduce interference to others. The FCC rules state that we should operate with good amateur practices and have also said that voice bandwidth using communication quality audio is appropriate. Currently, there are vast areas of HF spectrum that currently have absolutely zero ham radio signals. We don't need to use very narrow bandwidth signals when these conditions exist. It is good amateur radio practice to develop digital voice modes, at any bandwidth, and to explore the possiblities of new techniques. One of the techniques we should be exploring is the use of single-channel time multi-plexed digital voice repeaters on HF. Bonnie KQ6XA
Re: [digitalradio] HF Digital Voice repeaters Re: WinDRM Digital Voice
Currently, there are vast areas of HF spectrum that currently have absolutely zero ham radio signals. We don't need to use very narrow bandwidth signals when these conditions exist. It is good amateur radio practice to develop digital voice modes, at any bandwidth, and to explore the possiblities of new techniques. One of the techniques we should be exploring is the use of single-channel time multi-plexed digital voice repeaters on HF. Bonnie KQ6XA BONNIE Would you like to show us those frequency's? And would you like to show them when the MUF gets that high. Remember that DEAD 6 meter band ? Last Wednesdays I worked 87 stations on SSB alone and I'm here in Florida guys in the Midwest worked hundred's. And sunspots are near ZERO Take the Internet to Go: Yahoo!Go puts the Internet in your pocket: mail, news, photos more. http://mobile.yahoo.com/go?refer=1GNXIC
Re: [digitalradio] Digital Voice Repeaters on HF (Re: Nearly Vacant HF Spectrum)
AND if this is true why are they not legal now? --- expeditionradio [EMAIL PROTECTED] wrote: bruce mallon [EMAIL PROTECTED] wrote: Would you like to show us those frequency's? And would you like to show them when the MUF gets that high. Hi Bruce, Digital Voice repeaters, using single-channel near-real-time interleaved multiplexed OFDM, could work in a 5kHz bandwidth. This is a viable bandwidth for a single channel DV voice repeater in any HF amateur radio band, regardless of propagation. Take a look at the nearly vacant HF amateur radio spectrum, 24 hours/day, regardless of our position in the solar cycle: 21385-21450 kHz nearly vacant 24/7/350 24890-24990 kHz nearly vacant 24/7/365 28550-29500 kHz nearly vacant 24/7/350 Other areas of HF amateur radio spectrum are nearly vacant at different times of day or night, relative to our position in the solar cycle. During at least 4 years at the bottom of every 11 year solar cycle, some HF amateur radio bands are nearly vacant at various times of day or night. Examples of nearly vacant HF ham bands: 1800-2000 kHz 2hr after sunrise to 2hr before sunset 3500-4000 kHz 5hr after sunrise to 3hr before sunset 14000-14350 kHz 5hr after sunset to 1hr before sunrise 18000-18168 kHz 4hr after sunset to sunrise 21000-21450 kHz 4hr after sunset to sunrise 24890-24990 kHz 3hr after sunset to sunrise 28000-29500 kHz 3hr after sunset to sunrise 73 Bonnie KQ6XA Yahoo! oneSearch: Finally, mobile search that gives answers, not web links. http://mobile.yahoo.com/mobileweb/onesearch?refer=1ONXIC
Re: [digitalradio] Digital Voice Repeaters on HF (Re: Nearly Vacant HF Spectrum)
Now I'm not a big 12 meter guy but from what i remember it gets packed when open. On 10 meters 29.000 - 29.200 has classic AM, 29.2 - 29.5 used to have some satellite users ... IF you could show under OPEN band conditions it might work you might have something HOWEVER E-Skip can come and go without warning. Get the free Yahoo! toolbar and rest assured with the added security of spyware protection. http://new.toolbar.yahoo.com/toolbar/features/norton/index.php
Re: [digitalradio] Digital Voice Repeaters on HF (Re: Nearly Vacant HF Spectrum)
I would love to try a DV repeater on upper HF...10m soulds like the perfect spot. Repeaters are legal there and phone is legal so it should be? Also, on 17m don't go below 18.068, hihi. 73, Leigh/WA5ZNU
[digitalradio] Digital Voice Repeaters on HF (Re: Nearly Vacant HF Spectrum)
OK, I will ask... Am I correct in assuming that rules would need to change to allow automatic operation? Is it right to think the only improvement in communications would be extending ground wave (since this would happen when the bands were not open)? What would happen when the bands did open? Would the repeaters be able to listen before transmitting? For all modes? Is the primary purpose to use the bands so we don't lose them? Howard K5HB --- In digitalradio@yahoogroups.com, expeditionradio [EMAIL PROTECTED] wrote: bruce mallon wa4gch@ wrote: Would you like to show us those frequency's? And would you like to show them when the MUF gets that high. Hi Bruce, Digital Voice repeaters, using single-channel near-real-time interleaved multiplexed OFDM, could work in a 5kHz bandwidth. This is a viable bandwidth for a single channel DV voice repeater in any HF amateur radio band, regardless of propagation. Take a look at the nearly vacant HF amateur radio spectrum, 24 hours/day, regardless of our position in the solar cycle: 21385-21450 kHz nearly vacant 24/7/350 24890-24990 kHz nearly vacant 24/7/365 28550-29500 kHz nearly vacant 24/7/350 Other areas of HF amateur radio spectrum are nearly vacant at different times of day or night, relative to our position in the solar cycle. During at least 4 years at the bottom of every 11 year solar cycle, some HF amateur radio bands are nearly vacant at various times of day or night. Examples of nearly vacant HF ham bands: 1800-2000 kHz 2hr after sunrise to 2hr before sunset 3500-4000 kHz 5hr after sunrise to 3hr before sunset 14000-14350 kHz 5hr after sunset to 1hr before sunrise 18000-18168 kHz 4hr after sunset to sunrise 21000-21450 kHz 4hr after sunset to sunrise 24890-24990 kHz 3hr after sunset to sunrise 28000-29500 kHz 3hr after sunset to sunrise 73 Bonnie KQ6XA
[digitalradio] Digital Voice Repeaters on HF
Leigh/WA5ZNU wrote: I would love to try a DV repeater on upper HF...10m soulds like the perfect spot. Repeaters are legal there and phone is legal so it should be? A single channel time-multiplexed digital voice repeater is not classified as a Repeater under FCC rules. It can transmit in any phone band on MF/HF/VHF. I propose that we start at the top end of 20 meters, at center frequency 14346 (occupied bandwidth 14343 to 14349), and put the first DV repeater there. FCC rules: ยง97.3 Definitions. (a) The definitions of terms used in Part 97 are: (39) Repeater. An amateur station that simultaneously retransmits the transmission of another amateur station on a different channel or channels. Bonnie KQ6XA .
Re: [digitalradio] Digital Voice Repeaters on HF (Re: Nearly Vacant HF Spectrum)
Hello, Howard I snipped everything out except for that quoted, because I couldn't think of a better reason than that asked in your question. So I say, YES! (even if it might not be so, but let 'em think it is). Just by that, inovation might surface in the process. If we don't use the frequencies, then it's our own fault for not holding on to them when they're taken. Sorry if I took a simplistic view but what the hey. It's only one aspect of your thread, I know. Howard W6IDS Richmond, IN - Original Message - From: Howard Brown [EMAIL PROTECTED] To: digitalradio@yahoogroups.com Sent: Sunday, May 13, 2007 9:14 PM Subject: [digitalradio] Digital Voice Repeaters on HF (Re: Nearly Vacant HF Spectrum) OK, I will ask... SNIP SNIP Is the primary purpose to use the bands so we don't lose them?
[digitalradio] Re: RTTY Configurations
Hi Simon. I only allowed the HAM subtype of RTTY in PocketDigi mostly because of my time lack to port everything. The other reason is to keep the UI simple, which is probably the reason of your question. I asked the same question about used submodes as you couple of months ago here at this list. The only requests I got are from the yachters for allowing reception of DWD (Deutche Wetterdienst) broadcasts. http://www.dwd.de/de/wir/Geschaeftsfelder/Seeschifffahrt/Sendeplaene/broadcast_rtty_1prog.pdf http://www.dwd.de/de/wir/Geschaeftsfelder/Seeschifffahrt/Sendeplaene/broadcast_rtty_2prog.pdf The others are perfectly content with the just one submode. Hope it helps. 73, Vojtech OK1IAK
