[digitalradio] Re: RTTY Standard
--- In digitalradio@yahoogroups.com, Robert Chudek - K0RC [EMAIL PROTECTED] wrote: For amateur radio stations, 45.45 bauds and 170 Hz shift. Don't be surprised to find some 200Hz shift there too. Kantronics or someone used it as their standard, but generally, 170Hz machines had no problem decoding it. Brad VK2QQ
Re: [digitalradio] An experiment: APRS on Yahoo maps
Hi Joe, It works well but I think the satellite pictures are from the stone age, at least around here. Darrel, VE7CUS On 12-Feb-08, at 11:08 AM, Joe Veldhuis wrote: http://www.electroblog.com/radio/yahooaprs/index.php Something I've been working on on-and-off for awhile. There are at least a dozen web apps out there that plot APRS data on Google maps, but in many areas (including all of Ottawa and Allegan counties in Michigan) there is no high-resolution aerial imagery. Yahoo's maps have medium to high-res imagery almost everywhere, but I haven't been able to find any APRS plotters using them. On the request of a local ham, a few months ago I threw together something that would get the location of a given APRS station, then redirect to a Yahoo map centered there. I left it like that until today, when I decided to start working on it again. Now, rather than simply redirecting to Yahoo's site, it actually embeds a map on my own page. I haven't yet implemented the APRS icon set, but that will soon be done. Using Yahoo's AJAX API it is possible to put markers on the map using any specified image, so it's just a matter of taking the icon code for the station and selecting the appropriate image. The goal is to provide as much information as possible about a single, explicitly queried station. Eventually I'll have status and comment text, as well as any weather data, displayed along with the position. It's not possible to make something like aprs.he.fi since that would require me to constantly monitor the APRS-IS feed, which would require a daemon process, which my host doesn't allow. I suppose I could do it on my home computer if there were demand for such a thing... Comments? -Joe, N8FQ
[digitalradio] SOFTWARE HELP NEEDED ?
Hi all i need some information where do i find software that will run my rtty/amtor terminal unit. I have both mfj and kantronics utu units early types can someone recomend software and where to look fer it. Any help is greatly appreciated i used to run a program called mbator but it's lost now been of the air fer 20 yrs want to get my station running agn. Thanks Regards Mike VK2OZ.
[digitalradio] An experiment: APRS on Yahoo maps
http://www.electroblog.com/radio/yahooaprs/index.php Something I've been working on on-and-off for awhile. There are at least a dozen web apps out there that plot APRS data on Google maps, but in many areas (including all of Ottawa and Allegan counties in Michigan) there is no high-resolution aerial imagery. Yahoo's maps have medium to high-res imagery almost everywhere, but I haven't been able to find any APRS plotters using them. On the request of a local ham, a few months ago I threw together something that would get the location of a given APRS station, then redirect to a Yahoo map centered there. I left it like that until today, when I decided to start working on it again. Now, rather than simply redirecting to Yahoo's site, it actually embeds a map on my own page. I haven't yet implemented the APRS icon set, but that will soon be done. Using Yahoo's AJAX API it is possible to put markers on the map using any specified image, so it's just a matter of taking the icon code for the station and selecting the appropriate image. The goal is to provide as much information as possible about a single, explicitly queried station. Eventually I'll have status and comment text, as well as any weather data, displayed along with the position. It's not possible to make something like aprs.he.fi since that would require me to constantly monitor the APRS-IS feed, which would require a daemon process, which my host doesn't allow. I suppose I could do it on my home computer if there were demand for such a thing... Comments? -Joe, N8FQ
Re: [digitalradio] Re: RTTY Standard
Robert Chudek - K0RC wrote: I know the AEA PK-232 used 200 Hz, as well as the Heathkit HK-232, but the Kantronics _KAM_ series all used 170 Hz shift. That was the reason I switched from the AEA to the KAM products. What Kantronics models used 200 Hz shift? 73 de Bob - KØRC in MN Precisely, the KPC-2 used as dumb modem with an RTTY or pactor terminal. I made it run with Terman93. Sometimes it did well, sometimes, not so well...I added a tuning aid with two LEDs. Actually, the KPC-2 was intended only for packet... 73, Jose, CO2JA __ Participe en Universidad 2008. 11 al 15 de febrero del 2008. Palacio de las Convenciones, Ciudad de la Habana, Cuba http://www.universidad2008.cu
Re: [digitalradio] Re: Operating FSK RTTY in a contest ?
MultiPSK can do 850Hz shift RTTY and add a CR at 72 chars if anyone feels like recreating the old days! maybe there's someone still with a mechanical RTTY machine who will let some of us younger guys experience a QSO... I'm up for it but it would have to be 30m (only decent antenna I got right now) 73, Sholto KE7HPV. Les Warriner wrote: That smell and those sounds will never be forgotten. Too bad the brats have no chance to experience them, 15, 19, etcLoops - reminiscing 73 Les At 07:30 AM 2/12/2008, you wrote: --- In mailto:digitalradio%40yahoogroups.comdigitalradio@yahoogroups.com, Robert Chudek - K0RC [EMAIL PROTECTED] wrote: I started my RTTY career using 2125 and 2975 tones... Same here, and with a pre-WW-II Super Pro receiver that would have drifted right out the window if it had not been screwed down. And a transmitter of the same vintage with a VFO down in the broadcast band and multiplying all the way up. Operation on 20M was practically unthinkable, even if we had not been in an extreme fringe area for TV and even if the transmitter had not had about 18 of excess lead length in the PA tank circuit. until those young brats started pushing the envelope (or should I say, squeezing the envelope) with those 170 Hz tones... things were much simpler in those good ole days... your betcha... the smell of a well oiled machine, a whiff of ozone from the commutator, polar relays! (hey remember them?), and the quiet roar of all that machinery pounding out your CQ's... It was great... well, except for two things... having your platen pounded to death at the right margin, and coming home to find a half roll of paper behind the machine because some smart-a** thought it was cute to auto start your machine and feed it 15 minutes of line feeds. Yep, the good ole days... ! ! ! Seems like the late Irv Hoff was especially plagued with that problem, as he had a large fan club and a small but vocal anti-fan club. He worked out a scheme for the Model 28 stunt box - I have one of the machines fitted out that way, but I no longer remember exactly what it all was. It involved putting in the automatic carriage return and line feed kit, to take care of the occasional missing carriage return. Then it was something like having the carriage return character also do the line feed, and suppressing line feeds on repeated carriage returns. Jim W6JVE Internal Virus Database is out-of-date. Checked by AVG Free Edition. Version: 7.5.516 / Virus Database: 269.19.14/1247 - Release Date: 1/28/2008 10:59 AM
[digitalradio] Re: Operating FSK RTTY in a contest ?
--- In digitalradio@yahoogroups.com, Robert Chudek - K0RC [EMAIL PROTECTED] wrote: I started my RTTY career using 2125 and 2975 tones... Same here, and with a pre-WW-II Super Pro receiver that would have drifted right out the window if it had not been screwed down. And a transmitter of the same vintage with a VFO down in the broadcast band and multiplying all the way up. Operation on 20M was practically unthinkable, even if we had not been in an extreme fringe area for TV and even if the transmitter had not had about 18 of excess lead length in the PA tank circuit. until those young brats started pushing the envelope (or should I say, squeezing the envelope) with those 170 Hz tones... things were much simpler in those good ole days... your betcha... the smell of a well oiled machine, a whiff of ozone from the commutator, polar relays! (hey remember them?), and the quiet roar of all that machinery pounding out your CQ's... It was great... well, except for two things... having your platen pounded to death at the right margin, and coming home to find a half roll of paper behind the machine because some smart-a** thought it was cute to auto start your machine and feed it 15 minutes of line feeds. Yep, the good ole days... ! ! ! Seems like the late Irv Hoff was especially plagued with that problem, as he had a large fan club and a small but vocal anti-fan club. He worked out a scheme for the Model 28 stunt box - I have one of the machines fitted out that way, but I no longer remember exactly what it all was. It involved putting in the automatic carriage return and line feed kit, to take care of the occasional missing carriage return. Then it was something like having the carriage return character also do the line feed, and suppressing line feeds on repeated carriage returns. Jim W6JVE
Re: [digitalradio] Re: RTTY Standard
Jose A. Amador wrote: Kantronics and AEA too. I have a Communications Quarterly issue from the mid 90's somewhere here in which the author modifies A PK-232...forgot to include that its filters for 170 Hz and describes a great improvement for AMTOR...but also becomes almost useless for 300 baud packet. Jose, CO2JA __ Participe en Universidad 2008. 11 al 15 de febrero del 2008. Palacio de las Convenciones, Ciudad de la Habana, Cuba http://www.universidad2008.cu
Re: [digitalradio] Re: RTTY Standard
Kantronics and AEA too. I have a Communications Quarterly issue from the mid 90's somewhere here in which the author modifies its filters for 170 Hz and describes a great improvement for AMTOR...but also becomes almost useless for 300 baud packet. AM7910 modems have 200 Hz shift. Jose, CO2JA --- Brad wrote: --- In digitalradio@yahoogroups.com, Robert Chudek - K0RC [EMAIL PROTECTED] wrote: For amateur radio stations, 45.45 bauds and 170 Hz shift. Don't be surprised to find some 200Hz shift there too. Kantronics or someone used it as their standard, but generally, 170Hz machines had no problem decoding it. Brad VK2QQ __ Participe en Universidad 2008. 11 al 15 de febrero del 2008. Palacio de las Convenciones, Ciudad de la Habana, Cuba http://www.universidad2008.cu
Re: [digitalradio] Re: Operating FSK RTTY in a contest ?
That smell and those sounds will never be forgotten. Too bad the brats have no chance to experience them, 15, 19, etcLoops - reminiscing 73 Les At 07:30 AM 2/12/2008, you wrote: --- In mailto:digitalradio%40yahoogroups.comdigitalradio@yahoogroups.com, Robert Chudek - K0RC [EMAIL PROTECTED] wrote: I started my RTTY career using 2125 and 2975 tones... Same here, and with a pre-WW-II Super Pro receiver that would have drifted right out the window if it had not been screwed down. And a transmitter of the same vintage with a VFO down in the broadcast band and multiplying all the way up. Operation on 20M was practically unthinkable, even if we had not been in an extreme fringe area for TV and even if the transmitter had not had about 18 of excess lead length in the PA tank circuit. until those young brats started pushing the envelope (or should I say, squeezing the envelope) with those 170 Hz tones... things were much simpler in those good ole days... your betcha... the smell of a well oiled machine, a whiff of ozone from the commutator, polar relays! (hey remember them?), and the quiet roar of all that machinery pounding out your CQ's... It was great... well, except for two things... having your platen pounded to death at the right margin, and coming home to find a half roll of paper behind the machine because some smart-a** thought it was cute to auto start your machine and feed it 15 minutes of line feeds. Yep, the good ole days... ! ! ! Seems like the late Irv Hoff was especially plagued with that problem, as he had a large fan club and a small but vocal anti-fan club. He worked out a scheme for the Model 28 stunt box - I have one of the machines fitted out that way, but I no longer remember exactly what it all was. It involved putting in the automatic carriage return and line feed kit, to take care of the occasional missing carriage return. Then it was something like having the carriage return character also do the line feed, and suppressing line feeds on repeated carriage returns. Jim W6JVE Internal Virus Database is out-of-date. Checked by AVG Free Edition. Version: 7.5.516 / Virus Database: 269.19.14/1247 - Release Date: 1/28/2008 10:59 AM
[digitalradio] Re: PD Modes
PD Modes The PD modes were developed jointly by Don Rotier and Paul Turner. Although they're a little complicated, they represent a fair trade-off between color accuracy and transmission time. VIS CODES PD50 93d (decimal) PD90 99d PD120 95d PD160 98d PD180 96d PD240 97d PD290 94d COLOR MODE Y, R-Y, B-Y (See Appendix B) SCAN SEQUENCE Y, R-Y, B-Y NORMAL DISPLAY RESOLUTION PD50 320x256 (all include 16-line header) PD90 320x256 PD120 640x496 PD160 512x400 PD180 640x496 PD240 640x496 PD290 800x616 TRANSMISSION TIMES PD50 49.7 seconds PD90 90.0 seconds PD120 126.1 seconds PD160 160.9 seconds PD180 187.1 seconds PD240 248.0 seconds PD290 288.7 seconds COLOR SCAN TIMES (Y, R-Y, B-Y) PD50 91.520ms PD90 170.240ms PD120 121.600ms PD160 195.584ms PD180 183.040ms PD240 244.480ms PD290 228.800ms TIMING SEQUENCE Note: two complete lines are shown. (1) Sync pulse 20.000 1200hz (2) Porch 2.080ms 1500hz (3) Y scan (from odd line) (4) R-Y scan averaged for two lines (5) B-Y averaged for two lines (6) Y scan (from even line) Repeat until correct number of lines are transmitted for sub-mode Appendix B Y, R-Y, B-Y Color Encoding (Y, R-Y, B-Y) encoding is used in Robot and PD modes, as well as the seldomused Wrasse SC2-120 mode. This method of encoding is also referred to as (Y/C), (Y'U'V'), (Y'CBCR), and other names. Although all these refer to the same overall method of encoding, the exact scalings used vary somewhat by implementation and developer. The encoding used in ChromaPIX and W95SSTV is compliant with ITU BT. Rec. 601. (the 1953 NTSC standard) Because there has been no clearly-defined standard, the scalings described below may vary slightly from those used by other developers. To convert non-linear RGB to [Y, R-Y, B-Y] (scaled 0-255) : Y = 16.0 + (.003906 * ((65.738 * R) + (129.057 * G) + (25.064 * B))) RY = 128.0 + (.003906 * ((112.439 * R) + (-94.154 * G) + (-18.285 * B))) BY = 128.0 + (.003906 * ((-37.945 * R) + (-74.494 * G) + (112.439 * B))) Again, as with RGB encoding, these values can be converted to frequency, for SSTV transmission : Frequency = 1500 + (v * 3.1372549) (where `v' is the Y, R-Y, or B-Y value) Conversely, Y, R-Y, B-Y values scaled 0-255 may be converted back to nonlinear RGB: R = 0.003906 * ((298.082 * (Y 16.0)) + (408.583 * (RY 128.0))) G = 0.003906 * ((298.082 * (Y 16.0)) + (-100.291 * (BY 128.0)) + (-208.12 * (RY 128.0))) B = 0.003906 * ((298.082 * (Y 16.0)) + (516.411 * (BY 128.0))) From: http://www.barberdsp.com/files/Dayton%20Paper.pdf 73 de Roland PY4ZBZ --- In digitalradio@yahoogroups.com, Simon Brown [EMAIL PROTECTED] wrote: Does anyone have a full description of the SSTV PD modes developed by Don Rotier (SK I belive) and Paul Turner? Simon Brown, HB9DRV
Re: [digitalradio] Re: RTTY Standard
I know the AEA PK-232 used 200 Hz, as well as the Heathkit HK-232, but the Kantronics KAM series all used 170 Hz shift. That was the reason I switched from the AEA to the KAM products. What Kantronics models used 200 Hz shift? 73 de Bob - KØRC in MN - Original Message - From: Jose A. Amador To: digitalradio@yahoogroups.com Sent: Tuesday, February 12, 2008 8:35 AM Subject: Re: [digitalradio] Re: RTTY Standard Kantronics and AEA too. I have a Communications Quarterly issue from the mid 90's somewhere here in which the author modifies its filters for 170 Hz and describes a great improvement for AMTOR...but also becomes almost useless for 300 baud packet. AM7910 modems have 200 Hz shift. Jose, CO2JA --- Brad wrote: --- In digitalradio@yahoogroups.com, Robert Chudek - K0RC [EMAIL PROTECTED] wrote: For amateur radio stations, 45.45 bauds and 170 Hz shift. Don't be surprised to find some 200Hz shift there too. Kantronics or someone used it as their standard, but generally, 170Hz machines had no problem decoding it. Brad VK2QQ __ Participe en Universidad 2008. 11 al 15 de febrero del 2008. Palacio de las Convenciones, Ciudad de la Habana, Cuba http://www.universidad2008.cu
