[digitalradio] Re: Digital Pentathlon - 2008
-I just re-posted the info from their web site, http://dqso.net/index.files/digipen07.html , I am not sure hw accurate it is. Andy -- In digitalradio@yahoogroups.com, Dirk DK8EE [EMAIL PROTECTED] wrote: Hi Andrew! Stages are noticed at 2007? Is it correct? The 6 of june is... let me see... today! Very short announcement i think ;-) Correct dates? 73s de Dirk -DK8EE- Am Fr, 6.06.2008, 03:43, schrieb Andrew O'Brien: Digital Pentathlon - 2008 http://dqso.net/index.files/digipen07.html ... Date and time: Digital Pentathlon contanes 5 stages of a mode. PSK (BPSK63) mode will run from 1800 UTC to 2200 UTC on June,6 2007 MFSK (MFSK16) mode will run from 1800 UTC to 2200 UTC on June,13 2007 Olivia (500hz/16 tones) mode will run from 1800 UTC to 2200 UTC on June,20 2007 Hellschreiber (Feldhell) mode will run from 1800 UTC to 2200 UTC on June,27 2007 THROB (4 throb/sec) mode will run from 1800 UTC to 2200 UTC on July,4 2007 --
Re: [digitalradio] Digital Pentathlon - 2008
Hi Andrew! Stages are noticed at 2007? Is it correct? The 6 of june is... let me see... today! Very short announcement i think ;-) Correct dates? 73s de Dirk -DK8EE- Am Fr, 6.06.2008, 03:43, schrieb Andrew O'Brien: Digital Pentathlon - 2008 http://dqso.net/index.files/digipen07.html ... Date and time: Digital Pentathlon contanes 5 stages of a mode. PSK (BPSK63) mode will run from 1800 UTC to 2200 UTC on June,6 2007 MFSK (MFSK16) mode will run from 1800 UTC to 2200 UTC on June,13 2007 Olivia (500hz/16 tones) mode will run from 1800 UTC to 2200 UTC on June,20 2007 Hellschreiber (Feldhell) mode will run from 1800 UTC to 2200 UTC on June,27 2007 THROB (4 throb/sec) mode will run from 1800 UTC to 2200 UTC on July,4 2007 --
[digitalradio] KN4LF Daily LF/MF/HF/6M Frequency Radiowave Propagation Forecast #2008-22
The KN4LF Daily LF/MF/HF/6M Frequency Radiowave Propagation Forecast #2008-22 has been published on Friday 06/06/2008 at 1430 UTC, valid UTC Saturday 06/07/2008 through 2359 UTC Friday 06/13/2008 at http://www.kn4lf.com/kn4lf6.htm . 73 God Bless, Thomas F. Giella, KN4LF Lakeland, FL, USA [EMAIL PROTECTED] KN4LF Daily Solar Space Weather Geomagnetic Data Archive: http://www.kn4lf.com/kn4lf5.htm KN4LF Daily LF/MF/HF/6M Frequency Radiowave Propagation Forecast Archive: http://www.kn4lf.com/kn4lf6.htm KN4LF 160 Meter Radio Propagation Theory Notes: http://www.kn4lf.com/kn4lf8.htm LF/MF/HF/VHF Frequency Radiowave Propagation Email Reflector: http://montreal.kotalampi.com/mailman/listinfo/kn4lf
[digitalradio] Re: broadcast music on 14.070
It was called a Chinese firedrake in another group and has been on for a while. Before you ask what a firedrake is see http://www.satdirectory.com/firedrake.html for one explanation 73 John KE5HAM --- In digitalradio@yahoogroups.com, Walt [EMAIL PROTECTED] wrote: Am I the only one hearing an AM broadcaster on 14.070 right now ? S9 in Seattle, with a small vertical. No voice, just music over the last 45 min. And I thought 40 meters was rough . . Walt
Re: [digitalradio] Chinese Transmitter Re: broadcast music on 14.070
Sounds like the music is intended to jam the mandarin broadcast. Must be a broadcast from outside the targeted country and disfavored by the current administration. It quits every now and then so targeted country can judge its effectiveness, and so they can shut it off if the voice broadcast stops; no sense in wasting electricity. The country that sends it probably doesn't care a about amateur radio communications or the pirates that operate in our band. KE4MZ, Brent Dothan, AL [EMAIL PROTECTED] www.wb4zpi.org No trees were destroyed in the sending of this contaminant-free message. However, we do concede a significant number of electrons may have been inconvenienced.. - Original Message - From: expeditionradio [EMAIL PROTECTED] To: digitalradio@yahoogroups.com Sent: Friday, June 06, 2008 12:07 PM Subject: [digitalradio] Chinese Transmitter Re: broadcast music on 14.070 The signal started at 1600UTC, and it is extremely strong here in Hong Kong (local time midnight morning of Friday 06 June 2008). It makes it impossible to copy any ham radio stations between 14061 and 14079 kHz. Chinese jamming music... music intended to be used as a audio source for a jamming station. I can hear the same audio program material on 11750kHz and several other freqs. During short pauses in the music, I can also hear some background audio bleedover of news and commentary in Mandarin Chinese language... Likely a Chinese transmitter that is co-located at a multi-transmitter shortwave broadcast site. 73 Bonnie VR2/KQ6XA --- In digitalradio@yahoogroups.com, Walt [EMAIL PROTECTED] wrote: Am I the only one hearing an AM broadcaster on 14.070 right now ? Walt Announce your digital presence via our Interactive Sked Page at http://www.obriensweb.com/sked Check our other Yahoo Groups http://groups.yahoo.com/group/dxlist/ http://groups.yahoo.com/group/contesting http://groups.yahoo.com/group/themixwgroup Yahoo! Groups Links
[digitalradio] Chinese Transmitter Re: broadcast music on 14.070
Actually, Brent, the source of the jamming music audio feed that directly drives the transmitter is satellite audio, the right channel of a stereo satellite downlink 4GHz source. The left channel carries other programming on it in Mandarin and other Chinese dialects. There may be 60 to 80dB of separation, but it is easy to hear that far down when the signal is so strong here. If you have a large dish, or are within the footprint of the Chinasat satellite, you can pick up the jamming audio that feeds the jamming transmitters. I've attached the satellite information below. 73 Bonnie VR2/KQ6XA China National Radio and the Firedrake audio feeds are available via Chinasat 6B. Firedrake - Right Audio Lzh8Rdjy Circuit Satellite : Chinasat 6B Orbit Location : 115.5 East Frequency : 4175 MHz Polarity : Vertical Symbol Rate : 5990 FEC: 1/2 --- In digitalradio@yahoogroups.com, Brent Gourley [EMAIL PROTECTED] wrote: Sounds like the music is intended to jam the mandarin broadcast. Must be a broadcast from outside the targeted country and disfavored by the current administration. KE4MZ, Brent Dothan, AL [EMAIL PROTECTED] www.wb4zpi.org
Re: [digitalradio] Chinese Transmitter Re: broadcast music on 14.070
cool. I don't have any satellite capability, and don't have line of sight from SE Alabama anyway. at least, my last sentence is still correct!! - Original Message - From: expeditionradio [EMAIL PROTECTED] To: digitalradio@yahoogroups.com Sent: Friday, June 06, 2008 12:27 PM Subject: [digitalradio] Chinese Transmitter Re: broadcast music on 14.070 Actually, Brent, the source of the jamming music audio feed that directly drives the transmitter is satellite audio, the right channel of a stereo satellite downlink 4GHz source. The left channel carries other programming on it in Mandarin and other Chinese dialects. There may be 60 to 80dB of separation, but it is easy to hear that far down when the signal is so strong here. If you have a large dish, or are within the footprint of the Chinasat satellite, you can pick up the jamming audio that feeds the jamming transmitters. I've attached the satellite information below. 73 Bonnie VR2/KQ6XA China National Radio and the Firedrake audio feeds are available via Chinasat 6B. Firedrake - Right Audio Lzh8Rdjy Circuit Satellite : Chinasat 6B Orbit Location : 115.5 East Frequency : 4175 MHz Polarity : Vertical Symbol Rate : 5990 FEC: 1/2 --- In digitalradio@yahoogroups.com, Brent Gourley [EMAIL PROTECTED] wrote: Sounds like the music is intended to jam the mandarin broadcast. Must be a broadcast from outside the targeted country and disfavored by the current administration. KE4MZ, Brent Dothan, AL [EMAIL PROTECTED] www.wb4zpi.org Announce your digital presence via our Interactive Sked Page at http://www.obriensweb.com/sked Check our other Yahoo Groups http://groups.yahoo.com/group/dxlist/ http://groups.yahoo.com/group/contesting http://groups.yahoo.com/group/themixwgroup Yahoo! Groups Links
[digitalradio] 14092 USB for PSK31while chinese jammer is on
May I suggest a temporary alternate frequency for PSK31 while the Chinese jam 14070? 14092.0 kHz USB If past history of the Chinese Firedrake Jammer is any indication, we can look forward to many more days or months of jamming on 14070. They jammed 18160kHz (+/- 10kHz) for about a year before moving eventually to another frequency. 73 Bonnie VR2/KQ6XA
Re: [digitalradio] ALE 400 auto speed change
With the ALE/FAE modes, the basic ALE 8FSK waveform is used, only slowed down in baud speed from 125 to 50, with the improved sensitivity but reduced throughput, but of course, a much narrower ham friendly bandwidth conserving mode when in ALE/FAE400 vs ALE/FAE 2000. Note that the bandwidth is perhaps five times wider for 2 1/2 times more throughput. This strikes me as one of the best features of Pactor 2 since it always stays close to a 500 Hz footprint, with a constant 100 baud rate, even when it moves to the higher speed constellations from DPSK and through QPSK, 8-PSK, and 16-PSK. Pactor 3 can expand and contract from over 2000 Hz down to around 1000 Hz when it drops to only 2 tones in its most robust mode. It only uses DPSK and QPSK and no higher constellations. At the slowest speed, it may only exceed P2 capability a modest amount (due to the wider spacing of the two tones), but has a net raw speed of only 77 bps. I would expect other modes to perform close to that with similar tone spacing. If you have larger set of tones, such as 8FSK, I wonder if you can adapt as much in terms of baud rate speed changes vs. keeping tone numbers smaller but with higher constellations? And then the bigger effect of P3 which can completely drop tones as needed for more robustness instead of speed. Dr. Rink (SCS) has said that PSK modes do require slightly less S/N ratio over FSK modes and perhaps with always on FEC coding may be a wise choice of modulation using two tones that are modulated with varying constellations? Most of the new soundcard modes have quite a few tones in them, at least 8 or more, and maybe reducing the number of tones might be more ham friendly and still have good throughput? Two tones effectively doubles the throughput compared with single tone PSK mode and yet allows for a relatively low crest factor in concentrating more energy into each of the tones rather than spreading them very thin across many tones. Pactor 3 is very similar to P2, but has the nearly five times wider footprint without being able to operate 5 times faster. I am not sure how often P2 can reach the highest speed level of around 700 bps plus compression compared to how often P3 can reach its highest speed level SL-6 at 2722 bps plus compression, but I suspect that P2 can generally outperform P3 when you take the bandwidth into consideration. But if we only need to change the baud rate of the 8FSK signal, we can do that now with switching between 8FSK50 and 8FSK125 with the attendant problem of drastically widening the footprint and the increased difficulty of finding a clear area to transmit. 73, Rick, KV9U So Andrew O'Brien wrote: Would it be possible for ALE 400 in multipsk to use the SNR measurement of the slave station and signal the master to switch to a slower/faster speed when indicated ?
[digitalradio] Re: broadcast music on 14.070
Thanks for the info so soon - made for interesting reading . . . Hope it does not start a trend - or a new broadcast band . . Walt
RE: [digitalradio] broadcast music on 14.070
I hear it here in Northern California (Tuolumne) too. S8 on a dipole. Matt -Original Message- From: digitalradio@yahoogroups.com [mailto:[EMAIL PROTECTED] Behalf Of Walt Sent: Friday, June 06, 2008 8:32 AM To: digitalradio@yahoogroups.com Subject: [digitalradio] broadcast music on 14.070 Am I the only one hearing an AM broadcaster on 14.070 right now ? S9 in Seattle, with a small vertical. No voice, just music over the last 45 min. And I thought 40 meters was rough . . Walt
[digitalradio] Re: 14092 USB for PSK31while Chinese jammer is on
I must have missed a lot while my email client has been down. How has the interfering been identified as coming from China?- Dick kc4cop -- In digitalradio@yahoogroups.com, expeditionradio [EMAIL PROTECTED] wrote: May I suggest a temporary alternate frequency for PSK31 while the Chinese jam 14070? 14092.0 kHz USB If past history of the Chinese Firedrake Jammer is any indication, we can look forward to many more days or months of jamming on 14070. They jammed 18160kHz (+/- 10kHz) for about a year before moving eventually to another frequency. 73 Bonnie VR2/KQ6XA
[digitalradio] Re: 14092 USB for PSK31while Chinese jammer is on
pse disregard my request. I got my answer on 2-meters. Dick kc4cop --- In digitalradio@yahoogroups.com, expeditionradio [EMAIL PROTECTED] wrote: May I suggest a temporary alternate frequency for PSK31 while the Chinese jam 14070? 14092.0 kHz USB If past history of the Chinese Firedrake Jammer is any indication, we can look forward to many more days or months of jamming on 14070. They jammed 18160kHz (+/- 10kHz) for about a year before moving eventually to another frequency. 73 Bonnie VR2/KQ6XA
Re: [digitalradio] Re: 14092 USB for PSK31while Chinese jammer is on
Hi Dick: Just to let you know we get the same Chinees station in here on 7.173 every afternoon at 4pm CST. this goes on almost everyday.. I'm pretty sure its the same one... Garrett / AA0OI - Original Message From: kc4cop996 [EMAIL PROTECTED] To: digitalradio@yahoogroups.com Sent: Friday, June 6, 2008 2:06:51 PM Subject: [digitalradio] Re: 14092 USB for PSK31while Chinese jammer is on I must have missed a lot while my email client has been down. How has the interfering been identified as coming from China?- Dick kc4cop -- In digitalradio@ yahoogroups. com, expeditionradio expeditionradio@ ... wrote: May I suggest a temporary alternate frequency for PSK31 while the Chinese jam 14070? 14092.0 kHz USB If past history of the Chinese Firedrake Jammer is any indication, we can look forward to many more days or months of jamming on 14070. They jammed 18160kHz (+/- 10kHz) for about a year before moving eventually to another frequency. 73 Bonnie VR2/KQ6XA
[digitalradio] QRV Digital Voice 14236.0
All, QRV on digital voice - 14236.0 FDMDV. Will be on most of the evening. Tony - K2MO
Re: [digitalradio] ALE 400 auto speed change
Hello Rick, Note that the bandwidth is perhaps five times wider for 2 1/2 times more throughput. Normally it would be possible to have a 2000 Hz ALE at 250 bauds instead of 125 bauds. For, I suppose, a reason of frequency diversity, the shift between two adjacent tones in ALE is twice the baudrate (when the minimum between two adjacent tones would be a shift in Hz equal to the baudrate). However for big transfer speeds, there are the choice between several solutions, for example: * something close to the 110A solution: one carrier modulated at 2400 bauds 8ary PSK and different configurations (but with a necessary equalizer and some regular known data to supply the equalizer), * or many carriers modulated in BPSK (or QPSK) as with MT63, but a weak crest factor and no need for an equalizer. 73 Patrick - Original Message - From: Rick W. To: digitalradio@yahoogroups.com Sent: Friday, June 06, 2008 8:48 PM Subject: Re: [digitalradio] ALE 400 auto speed change With the ALE/FAE modes, the basic ALE 8FSK waveform is used, only slowed down in baud speed from 125 to 50, with the improved sensitivity but reduced throughput, but of course, a much narrower ham friendly bandwidth conserving mode when in ALE/FAE400 vs ALE/FAE 2000. Note that the bandwidth is perhaps five times wider for 2 1/2 times more throughput. This strikes me as one of the best features of Pactor 2 since it always stays close to a 500 Hz footprint, with a constant 100 baud rate, even when it moves to the higher speed constellations from DPSK and through QPSK, 8-PSK, and 16-PSK. Pactor 3 can expand and contract from over 2000 Hz down to around 1000 Hz when it drops to only 2 tones in its most robust mode. It only uses DPSK and QPSK and no higher constellations. At the slowest speed, it may only exceed P2 capability a modest amount (due to the wider spacing of the two tones), but has a net raw speed of only 77 bps. I would expect other modes to perform close to that with similar tone spacing. If you have larger set of tones, such as 8FSK, I wonder if you can adapt as much in terms of baud rate speed changes vs. keeping tone numbers smaller but with higher constellations? And then the bigger effect of P3 which can completely drop tones as needed for more robustness instead of speed. Dr. Rink (SCS) has said that PSK modes do require slightly less S/N ratio over FSK modes and perhaps with always on FEC coding may be a wise choice of modulation using two tones that are modulated with varying constellations? Most of the new soundcard modes have quite a few tones in them, at least 8 or more, and maybe reducing the number of tones might be more ham friendly and still have good throughput? Two tones effectively doubles the throughput compared with single tone PSK mode and yet allows for a relatively low crest factor in concentrating more energy into each of the tones rather than spreading them very thin across many tones. Pactor 3 is very similar to P2, but has the nearly five times wider footprint without being able to operate 5 times faster. I am not sure how often P2 can reach the highest speed level of around 700 bps plus compression compared to how often P3 can reach its highest speed level SL-6 at 2722 bps plus compression, but I suspect that P2 can generally outperform P3 when you take the bandwidth into consideration. But if we only need to change the baud rate of the 8FSK signal, we can do that now with switching between 8FSK50 and 8FSK125 with the attendant problem of drastically widening the footprint and the increased difficulty of finding a clear area to transmit. 73, Rick, KV9U So Andrew O'Brien wrote: Would it be possible for ALE 400 in multipsk to use the SNR measurement of the slave station and signal the master to switch to a slower/faster speed when indicated ?
Re: [digitalradio] Hellschreiber History
Fascinating, many thanks for sharing. Andy. On Fri, Jun 6, 2008 at 1:54 PM, Pete Kemp [EMAIL PROTECTED] wrote: Interested in Hellschreiber History? While exploring eBay I found the following item being offered for sale. I am NOT connected with this sale in any way. 73, Pete, KZ1Z FH# 8: --- 1927 Picture Transmission Fax Invention, Rudolf Hell Item number: 150230791145 --- Bildfunk (Picture Transmission) Anleitung zum Selbstbau eines Bildempfaengers (Guide for Building Picture Receivers) by Rudolf Hell Die Radio-Reihe/Band 21 Schmidt, Berlin, 1927. In German. Black hard covers with white lettering, octavo, 114 pages, 80 bw photographs, schematic diagrams and illustrations Very scarce book by the prominent German engineer and inventor of the first facsimile transmission apparatus as well as many other inventions in radio technology and other fields. This book describes his invention of the Hellschreiber. Rudolf Hell developed technology that led to the fax and the color scanner. Hell's landmark invention was a machine for transmitting text that electronically broke up letters into a stream of dots reassembled at the receiving end, in effect the first telefax. The commercial success of his 1929 Hell Recorder allowed him to found his own company. The technology was less prone to poor reception than telex transmissions, making Hell's machines popular for news agencies, the post office and police departments. In the 1920s, he also invented an image scanning tube for televisions and a radio-beam flight-path finder that is considered a forerunner of aircraft autopilots.During World War II in Nazi Germany, Hell worked on encoding machines. After the wartime destruction, he resumed business in 1947 and came up with inventions that revolutionized the graphic arts. An electronically controlled engraver unveiled in 1954 made photo publishing easier for newspapers, and an early version of the color scanner followed in 1963. Hell also was a pioneer of electronic digital typesetting in the 1960s, which ushered out the traditional method using lead. Hell sold his Kiel-based company in 1981 to German industrial giant Siemens. It was later merged with Linotype AG to become Linotype-Hell AG, which in turn was taken over by German printing press maker Heidelberger Druckmaschinen in 1996. Rudolf Hell (December 19, 1901 March 11, 2002) was a German inventor. He was born in Eggm??hl, Bavaria, Germany.From 1919 to 1923 he studied electrical engineering in Munich. He worked there from 1923 to 1929 as assistant of Prof. Max Dieckmann, with whom he operated a television station at the Verkehrsausstellung (lit.: Traffic exhibition) in Munich in 1925. In the same year Hell invented an apparatus called the Hellschreiber, an early forerunner to the fax. Hell received a patent for the Hellschreiber in 1929. In the year 1929 he founded his own company in Babelsberg, Berlin. After World War II he re-founded his company in Kiel. He kept on working as an engineer and invented machines for electronically controlled engraving of printing plates and an electronic photo typesetting system called digiset. He has received numerous awards such as the Knight Commander's Cross of the Order of Merit of the Federal Republic of Germany, the Gutenberg Prize awarded by the City of Mainz and the Werner von Siemens Ring. His company was taken over by Siemens AG in 1981 and merged with Linotype in 1990, becoming Linotype-Hell AG.He died in Kiel, Germany. (Wikipedia)Condition: Good+ (Covers have minor shelfwear. Title page has name and date in pencil, triangular piece cut from the lower corner. Foreword page has creases and repair at gutter margin (with no loss of text). Text and illustrations are otherwise intact and clean. Binding is tight.) -- Andy K3UK www.obriensweb.com (QSL via N2RJ)
