[digitalradio] Re: Has anyone tried the ASuS EEE pc 901?
PocketDigi will run most digital modes (RTTY, PSK31, MFSK, Olivia ...) on any Windows desktop or laptop with 150MHz CPU. It is efficient enough to decode PSK31 on 75 MHz Pentium and show waterfall. 73, Vojtech OK1IAK --- In digitalradio@yahoogroups.com, Brent Gourley bg...@... wrote: I have run digipan on a 75 mHz P2 W95 notebook. Long ago. KE4MZ, Brent Dothan, AL bg...@... www.wb4zpi.org - Original Message - From: Ralph Mowery ku...@... To: digitalradio@yahoogroups.com Sent: Wednesday, June 24, 2009 9:42 PM Subject: Re: [digitalradio] Has anyone tried the ASuS EEE pc 901? --- On Mon, 6/22/09, jeffnjr484 jeffnjr...@... wrote: From: jeffnjr484 jeffnjr...@... Subject: [digitalradio] Has anyone tried the ASuS EEE pc 901? To: digitalradio@yahoogroups.com Date: Monday, June 22, 2009, 11:24 AM Hello, Has anyone used the ASUS laptop for psk31 or any digital modes im looking at it for some portable ops http://www.amazon.com/gp/product/B001BYD178/ref=noref?ie=UTF8s=pc It looks like a neat computer and the price is outstanding just wanted to know if anyone has tried it jeff kd4qit The 901 should be just fine for the digital modes. I have the ASUS 1000HE which is just about the same computer except for the hard drive vers the solid state memory and a few extras. I have used Digipan and several other programs for psk31 with no problem. Runs mmtty fine. If you do not have a usb to serial port adaptor you may not be able to control the rig. Some of the interface units come with the adaptors for this. It does not really take much of a computer to run basic psk31. I have ran psk 31 with some 200 mhz desktop computers years ago. Announce your digital presence via our Interactive Sked Pages at http://www.obriensweb.com/sked Recommended digital mode software: Winwarbler, FLDIGI, DM780, or Multipsk Logging Software: DXKeeper or Ham Radio Deluxe. Yahoo! Groups Links
[digitalradio] JT65B and C versus JT65A
While addressing an ARRL LOTW uploading issue with JT65 modes, I began to be intrigued about B and C that I have never tried . Here is an old 2004 explanation from Joe Taylor. Interesting ,at that time , that he was suggesting JT65B be the standard Mode Spacing Total BW - JT65A2.7 Hz 177.6 Hz JT65B5.4 355.3 JT65C 10.8 710.6 Note that JT65A is identical to the original JT65. If you want to work people who have not yet upgraded to v4.3.3, be sure to select mode JT65A. Otherwise, be sure to use the same mode that your QSO partner is using. Cross-mode contacts will not work. JT65B should be nearly as sensitive as JT65A, and it will be twice as forgiving of frequency instabilities. On balance, with existing stock radios, JT65B will probably be better than JT65A. JT65C is less sensitive by a small amount, perhaps 1 dB, but will be even more lenient on stability issues. By all means experiment with the different submodes, and be sure to let me know your conclusions about them! I am presently inclined to recommend that JT65B should become the standard JT65 mode. If this tentative conclusion holds up, future versions of the program may no longer support the A and C modes.
[digitalradio] Call for Papers--2009 ARRL/TAPR Digital Communications Conference
Technical papers are solicited for presentation at the 28th Annual ARRL and TAPR Digital Communications Conference to be held September 25-27, 2009 in Chicago, Illinois. These papers will also be published in the Conference Proceedings (you do NOT need to attend the conference to have your paper included in the Proceedings). The submission deadline is July 31, 2009. Please send papers to: Maty Weinberg ARRL 225 Main St Newington, CT 06111 or you can make your submission via e-mail to: m...@arrl.org Papers will be published exactly as submitted and authors will retain all rights. 73 . . . Steve, WB8IMY ARRL
[digitalradio] Field Day
We are operating as VE5XZ on field day, (3A) using as many digital modes as possible. Ops mostly 20/80m and will be active for the entire FD period. Locator is DO70QK Look forward to workin y'all John VE5MU
[digitalradio] North American Field Day: What u doing ?
I have been the digital ringer for a few clubs in the past few years, bringing lots of gear and demonstrating how digital modes work. This year I am not going to a highly competitive club, will do some casual CW for a local club and may do some really LOW tech digital modes operations. Instead of bringing my own gear, or getting frustrated setting up my laptop and software with other people's rigs... I'm going to run digital modes with wires. Microphone held to speakers! I think I should be able to make a few contacts at least! Andy K3UK
[digitalradio] Peek-a-boo sound devices
I use an internal sound card for ham operations and an external sound device , in the form of USB speakers, for routine PC/Internet work including DX announcements via Spotcollector. This works well except that every know and again ham applications that have been working well via the internal sound device all of a sudden have their settings switched and the sound for transmission gets sent to my speakers rather than to the rig. I can't figure out what triggers this? Sometimes Multipsk, Winwarbler, and WSJT, just tell me that USB AUDIO is set for my transmitted audio even though I had manually set it for the other device. It seems that is connected with changes I may make, like unplugging and then plugging in the USB speakers if I need to borrow the USB ports for something else for a few minutes. I have missed few QSOs when caught by surprise with the wrong xmit card. Ideas ?
Re: [digitalradio] Peek-a-boo sound devices
Andy, I have also found that Windows will reassign USB ports if anything is plugged in or unplugged. My solution was to set the default sound system to the onboard system and use USB for the ham devices, such as the SignaLink USB. The problem is especially troublesome when I plug my WebCam microphone in and out. If you use Skype, it will also grab your microphone. Sorry, that I don't have a foolproof solution for you., but offer you comfort in misery! ;-) 73, Skip KH6TY Andrew O'Brien wrote: I use an internal sound card for ham operations and an external sound device , in the form of USB speakers, for routine PC/Internet work including DX announcements via Spotcollector. This works well except that every know and again ham applications that have been working well via the internal sound device all of a sudden have their settings switched and the sound for transmission gets sent to my speakers rather than to the rig. I can't figure out what triggers this? Sometimes Multipsk, Winwarbler, and WSJT, just tell me that USB AUDIO is set for my transmitted audio even though I had manually set it for the other device. It seems that is connected with changes I may make, like unplugging and then plugging in the USB speakers if I need to borrow the USB ports for something else for a few minutes. I have missed few QSOs when caught by surprise with the wrong xmit card. Ideas ?
Re: [digitalradio] The ARQ Advantage?
AX25 allows several stations to operate within a bit of spectrum wide enough for one. For example, up to a dozen Q15x25 stations can operate within one 1k to 3k ( depending on how you scale the modems ) slice of spectrum. ARQ modes that do not operate under AX25 are incapable of this, and so are far less spectrally efficient, If spectral efficient means bytes per spectrum (kilohertz maybe) per time - then it's far more efficient to time multiplex where stations take turns passing traffic rather then trying to simultaneously use the spectrum. That's the same reason we all have home run 100 base T networks and switches on our personal networks instead of hubs or coax... The overhead and problems of sharing a channel are throughput killers.. 73 DE Charles, N5PVL More later... Bill - WA7NWP
Re: [digitalradio] Peek-a-boo sound devices
I had simmilar issues and found that I need to power down and reboot if I wish to swap out USB devices. When hot swaped it gave me hell. Now I make a point to make connections on USB devices with system off so it auto detects and remains with proper settings of my desire. On Fri, Jun 26, 2009 at 6:09 PM, Andrew O'Brien k3uka...@gmail.com wrote: I use an internal sound card for ham operations and an external sound device , in the form of USB speakers, for routine PC/Internet work including DX announcements via Spotcollector. This works well except that every know and again ham applications that have been working well via the internal sound device all of a sudden have their settings switched and the sound for transmission gets sent to my speakers rather than to the rig. I can't figure out what triggers this? Sometimes Multipsk, Winwarbler, and WSJT, just tell me that USB AUDIO is set for my transmitted audio even though I had manually set it for the other device. It seems that is connected with changes I may make, like unplugging and then plugging in the USB speakers if I need to borrow the USB ports for something else for a few minutes. I have missed few QSOs when caught by surprise with the wrong xmit card. Ideas ?
[digitalradio] EME/Joe Taylor featured in New York Times
http://www.nytimes.com/2009/06/27/technology/27moon.html By ASHLEE VANCE Published: June 26, 2009 PALO ALTO, Calif. Dogs bay at it. Lovers swoon under it. And some people like to bounce their voices off it. Michael Cousins, an engineer at SRI International, a non-profit that operates the dish, center, in the control room, with Ham operators Lance Ginner, left, and Jim Klassen. A radio dish at Stanford is powerful enough to bounce signals off the moon, a tricky endeavor. The first two are easy, but sending a voice signal 239,200 miles to the moon and back is not quite as simple. On Saturday, amateur radio buffs or hams, as they call themselves, will hold a global bounce-fest, using as many giant parabolic antenna radio telescopes as they can borrow around the world. Not that one needs an excuse to hold a moon-bounce, but this one is being held as a kind of advance celebration of the 40th anniversary next month of the Apollo 11 mission. Moon-bouncing, also known as Earth-Moon-Earth communications, or E.M.E. requires a higher grade of ham-radio technology than that used for traditional earth-bound communication across parts of the radio spectrum approved by governments for amateur use. Only about 1,000 hams worldwide have stations capable of moon-bouncing. Skill and luck also help. As the hams say, the moon is a poor sounding board, since it is spinning and has a rough surface that can disrupt signals. The hams' voices must survive atmospheric interference over the long round-trip journey in a discernible form. It's the equivalent of climbing Mount Everest in amateur radio, said Joseph H. Taylor Jr., a Nobel Prize winner and retired physics professor from Princeton University who has written software to help radio buffs communicate via weak signals. It's possible, but only barely possible. Large dishes like those owned by the government and communications companies can solve many of these problems by making it easier to send and receive signals. That's why the hobbyists have searched out retired or rarely used dishes. So far, operators of about 20 large dishes in the United States, Australia and Europe have agreed to participate in the event. One of them is located on a hill overlooking Stanford University's campus, and will serve as the command center for the weekend's event. Known simply as the Dish, the 150-foot-wide antenna, owned by the federal government, will be outfitted with special equipment and a computerized tracking system to keep a powerful, focused signal on the moon. A handful of radio enthusiasts have been working on the structure over the last few weeks, huddling inside a central command center below the towering, rusting web of metal. They gathered around whirring communications gear as if it were a campfire and chortled with satisfaction when their hellos bounced back from the moon 2.5 seconds later. There is a point beyond the because it's there challenge. The hams also hope to inspire young technology buffs. People think of ham radio as something Grandpa did down in the basement while he smoked and talked to people around the world, said Pat Barthelow, who has organized the worldwide moon-bounce, called Echoes of Apollo. I think moon-bounce retains an exoticness and difficulty that can hook some people and bring ham radio into the modern era. Creating a homemade radio capable of hitting the moon can require years of tweaking custom components. The setups cost $200 to $2,000. The United States military began bouncing radio signals off the moon in the 1950s to communicate over long distances when other transmission methods were hampered by atmospheric disruptions. By the mid-1960s, operators at large dishes started building amateur systems capable of moon-bouncing. In 1964, Michael Staal accomplished the feat, linking a setup at Stanford to another one in Australia. I got famous very quickly, said Mr. Staal, who sells antennas to ham radio operators. Moon-bouncers often hold contests where they must hunt around different frequencies and both send and receive a signal with another station, logging their activities for review. They're forbidden from communicating with each other via non-lunar means during the contests, and often win a certificate or free subscription to a ham magazine as prizes for making contact with as many others hams as they can. It is the thrill of pulling a weak signal out from a long distance that excites the amateur radio folks, said Jim Klassen, a ham in Reedley, Calif.
