Re: [digitalradio] ROS HF Path Simulations
On 8/1/2010 7:31 AM, Steinar Aanesland wrote: Hi Tony Have you done some test comparing ros with mods like psk31 , rtty , olivia etc? Yes I have Steinar Tony -K2MO a5vna Steinar On 20.07.2010 03:42, Tony wrote: All, With all the attention ROS has been getting lately, I thought it would be interesting to see how the narrow mode compared to the wide version under the controlled environment of the HF path simulator. After a few hours of testing, it seems there's little difference between the two. The simulator indicated that they both had the same sensitivity (-15db) and essentially the same poor channel performance characteristics (see throughput samples below). In no case did one mode outperform the other to the point where it would make any real difference; both have the essentially the same wpm rate as well. These tests are not conclusive, but they do suggest that there may not be any real advantage in using the wide mode vs narrow under most circumstances. Of course, the simulator can only emulate the basic characteristics of the real HF channel so it would be interesting to hear from those who have compared the two on-air. Tony -K2MO __ CCIR-520-2 POOR CHANNEL SIMULATIONS: -11DB SNR ROS 2250 / 16 baud the quick brown fox jumps over the lazy dog the quick brown fox jumps over the lazlµog Lghe quick brown fox jumps over the lazy dog the quccirown fox jumps over the lazy dog the quick brown fox jumps over the lazy dog Âe quick brown fox jumps over the lazy dog the quick brown fealoeumps ovahe lazEh/i ROS 500 / 16 baud the quick brown fox jumps over the lazy dog the quick brown fox jumps over the lazy dog the quick breFn fox juo3s over tes lazy dog the quæe t ´uls r?umps over the lazy dog the quick brown fox jumps over the lazy dog the quick brown f Á jumps over the lazy dog the quick brown fox jumps over the lazy dogQo
Re: [digitalradio] ROS HF Path Simulations
OK, is it public ? I can't find anything on digitalradio yahoogroup LA5VNA Steinar On 02.08.2010 12:58, Tony wrote: On 8/1/2010 7:31 AM, Steinar Aanesland wrote: Hi Tony Have you done some test comparing ros with mods like psk31 , rtty , olivia etc? Yes I have Steinar Tony -K2MO
[digitalradio] MAJOR GEOMAGNETIC STORM
*IPS GEOSTAT ALERT NUMBER 103: STATUS 5 CME OBSERVED MAJOR GEOMAGNETIC STORM POSSIBLE WITHIN 2-4 DAYS ISSUED AT 1928 UT ON 01 Aug 2010 BY IPS RADIO AND SPACE SERVICES FROM THE AUSTRALIAN SPACE FORECAST CENTRE* CT1QK http://www.obriensweb.com/digispotter.html Chat, Skeds, and Spots all in one (resize to suit) Facebook= http://www.facebook.com/pages/digitalradio/123270301037522 Yahoo! Groups Links * To visit your group on the web, go to: http://groups.yahoo.com/group/digitalradio/ * Your email settings: Individual Email | Traditional * To change settings online go to: http://groups.yahoo.com/group/digitalradio/join (Yahoo! ID required) * To change settings via email: digitalradio-dig...@yahoogroups.com digitalradio-fullfeatu...@yahoogroups.com * To unsubscribe from this group, send an email to: digitalradio-unsubscr...@yahoogroups.com * Your use of Yahoo! Groups is subject to: http://docs.yahoo.com/info/terms/
[digitalradio] Re: Fwd: [UDXF] STANAG Frequencies
Andy, Most of these are encrypted so don't expect much to read. A good one to try in the USA is on 8.4785MHz USB. They often run a test tape in the clear. When tuned in (and the right parameters set) you should see: OO FAAA DE RFLIE ZNR U ZUI TESTING RYRYRYRYRYRYRYRY SGSGSGSGSGSGSGSG .. repeated over and over. Try 600 bd, long interleave, 5 data bits (ITA2), 1 stop bit, no parity. Sigmira does an admirable job of 4285 decoding. Just make sure the waterfall cursor is centered at 1800Hz. 73 Sholto K7TMG --- In digitalradio@yahoogroups.com, Andy obrien k3uka...@... wrote: -- Forwarded message -- From: Lasse lasse.ra...@... Date: Sun, Aug 1, 2010 at 7:27 PM Subject: [UDXF] STANAG Frequencies To: u...@yahoogroups.com Hi all I have been mapping a few STANAG-4285 frequencies (thanks Ary for id'ing the mode) the week. I have used a FRG-7 which means that the frequencies are a bit uncertain. I have not had the time to check all frequencies with my DX-394, and many of those found are difficult to hear on that reciever due to the higher noise floor. I don't have the new Klingenfuss freq. list yet, so most of these are probably already known. Nevermind, I'll post them here anyway. Frequencies: -- 2561, 2579, 2613, 2632, 2767 -- 3295, 3385, 3425, 3863, 3995 -- 4030, 4055, 4140, 4163, 4203, 4210, 4229, 4235, 4255, 4263, 4289, 4299, 4310, 4315, 4320, 4402, 4410, 4435, 4525, 4563, 4643, 4685, 4780, 4880, 4965 -- 5118, 5160, 5225, 5362, 5428, 5760, 5790 -- 6228, 6250, 6340, 6348, 6390, 6410, 6440, 6457, 6470, 6480, 6495, 6787 -- 7555 -- 8553, 8618, 8633, 8702 -- 9099 -- 10115, 10264 -- 11465, 11705 -- 14630, 14720, 14934 -- 15647? -- Regards Lasse Repl lasse.ra...@...?subject=[udxf]+stanag+frequencies
[digitalradio] Hellschreiber on-air comparison
All, I spent a little time this weekend comparing FSK-Hell to the standard Feld Hell mode. FSK-Hell is a modified version of PSK-Hell which was developed to improve readability over HF. The difference tends to show up more on long-haul paths where signals are more likely to encounter ionospheric distortion. Unfortunately, I didn't find any DX, but I did manage to work a few west coast stations from here in W2. I didn't expect to see much of an improvement since conditions on 20 meters were relatively quite (moderate multi-path fading), but in practice, there was a noticeable difference. Contrast was noticeably improved and the text did stand out more with FSK-Hell than it did with Feld Hel. This is especially true with weak signals. The 105 baud mode allows even more contrast which shows up both on-air and with the path simulator. All in all, FSK-Hell does offer better readability over Feld Hell. Click on the link below to see an on-air and example of how the modes compared. FSK-Hell is available in IZ8BLY's Hellschreiber (FM-Hell), DM780, MixW and Multipsk. http://www37.zippyshare.com/v/71092013/file.html Tony -K2MO
Re: [digitalradio] Hellschreiber on-air comparison
Also available in Fldigi. On Aug 2, 2010, at 8:32 PM, Tony wrote: All in all, FSK-Hell does offer better readability over Feld Hell. Click on the link below to see an on-air and example of how the modes compared. FSK-Hell is available in IZ8BLY's Hellschreiber (FM-Hell), DM780, MixW and Multipsk. Dave K3DCW www.k3dcw.net
Re: [digitalradio] Hellschreiber on-air comparison
Hi Tony, I have often switched from FH to FSK-Hell when working the States from VK via the Long-Path on 20M when conditions are poor. Often switching to FSK was the only way to complete (or even initiate) the QSO and the improvement in copy was often quite dramatic, from very difficult/impossible copy to arm-chair copy. de Laurie, VK3AMA On 3/08/2010 10:32 AM, Tony wrote: All, I spent a little time this weekend comparing FSK-Hell to the standard Feld Hell mode. FSK-Hell is a modified version of PSK-Hell which was developed to improve readability over HF. The difference tends to show up more on long-haul paths where signals are more likely to encounter ionospheric distortion. Unfortunately, I didn't find any DX, but I did manage to work a few west coast stations from here in W2. I didn't expect to see much of an improvement since conditions on 20 meters were relatively quite (moderate multi-path fading), but in practice, there was a noticeable difference. Contrast was noticeably improved and the text did stand out more with FSK-Hell than it did with Feld Hel. This is especially true with weak signals. The 105 baud mode allows even more contrast which shows up both on-air and with the path simulator. All in all, FSK-Hell does offer better readability over Feld Hell. Click on the link below to see an on-air and example of how the modes compared. FSK-Hell is available in IZ8BLY's Hellschreiber (FM-Hell), DM780, MixW and Multipsk. http://www37.zippyshare.com/v/71092013/file.html Tony -K2MO http://www.obriensweb.com/digispotter.html Chat, Skeds, and Spots all in one (resize to suit) Facebook= http://www.facebook.com/pages/digitalradio/123270301037522 Yahoo! Groups Links
[digitalradio] Scouts High Altitude Balloon ATV/Repeater/Digital Mode Beacons, August 7th
http://forums.qrz.com/showthread.php?t=258523 High Altitude Balloon for Scouts to carry ATV/Repeater/Digital Mode beacons on Aug 7 To Radio Operators across IL, IN, WI, OH, MO, KY and beyond... August 7th, 2010 as part of the Scouts Space Jam Technology Merit Badge Workshop, more info at http://spacejamboree.com, 2 helium balloons will launch with ham radio aboard... details below, we appreciate signal reports, or participation. Balloon 1 (DePauw University BASE Flight 48) schedule to launch approx. 8:00 CT from Rantoul, IL APRS Tracking 144.390MHz using callsign N9QGS-11 every one minute with no path DominoEX-22 followed by 300 baud ASCII RTTY (200 hz shift) every minute with Morse code ID every 5 minutes. Flight can be tracked at http://www.spacenear.us/tracker Amateur Television from balloon on 434 MHz NTSC Flight scheduled for 1000/ft ascent till burst at ~95,000ft Balloon 2 (DePauw University BASE Flight 49) schedule to launch approx. 8:30 CT from Rantoul, IL APRS Tracking 144.390MHz using callsign W9YJ-11 every one minute with no path Cross band repeater with input frequency: 144.360 MHz and an output frequency: 446.025 MHz down, no PL, please check in with net control (contact with ISS and scouts possibly may be rebroadcasted during flight through balloon.) A float valve will be used to keep repeater up at 60,000+ feet for approx. 90 minutes; Estimated time for cross band maximum range should be approx. from 1430 UTC till 1600 UTC and above 45 kft from 1415 UTC till 1630 UTC. DominoEX-22 and RTTY 300 baud (200 spacing) Ascii every minute on TBA frequency and callsign (watch twitter for this information) How to follow the action on the internet: You can track the balloons using APRS technology at http://tinyurl.com/2ed2u85 Watch decoded DominoEX/RTTY flight data at http://spacenear.us/tracker Flight details and status on Twitter at http://twitter.com/base_depauw
Re: [digitalradio] ROS HF Path Simulations
Steinar, I've been monitoring ROS on-the-air and I've done some testing with the HF path simulator. In my opinion, it's about as good as one would expect from an MFSK mode with a relatively slow baud rate. Tests show that it will outperform RTTY and PSK31 in poor channel conditions (most MFSK modes do) but it does not appear to be as robust as Olivia. For example, it is less tolerant to Doppler spreading than Olivia so it's less likely to do well when the ionosphere disturbed. This is especially true for polar paths and the low-latitude ionosphere where Doppler spread is more of an issue. While the mode performs well over HF, the additional bandwidth doesn't appear to have any throughput advantage over other modes that use less spectrum. In fact, path simulations indicate that there is no difference in throughput between ROS 500/16 and ROS 2250/16. Tony -K2MO
