[digitalradio] Re: An observation on Olivia
Skip, Is this done with all-mode rigs are is it audio over FM? Leigh/WA5ZNU On Sat, 3 Feb 2007 12:38 pm, Skip wrote: Here in South Carolina, we are running a PSK63 net on 2-meters, Leigh, We are all using multimode rigs such as the IC-746, IC-706MKII, FT897, etc, using SSB and modulating with DominoEX 11 or PSK63. The point-to-point range is reliably over 100 miles, and one station that checks in regularly from 200 miles distant, lives on a 200 foot hill, and uses an 18 element beam on a 50 foot tower. The typical station is running 25 watts or less. Those outside of a 50 mile radius generally use 10 to 13 element beams. As Net Control, I simply retransmit all incoming text at 100 wpm, so all stations point their antennas at Net Control and I cut and paste what they have typed (at around 20 wpm) and retransmit at 100 wpm so nobody ever gets left out due to distance or location. Most stations within 30 miles can copy the other stations anyway. We started out over a year ago using audio over FM, but the point-to-point range was only about 30 miles. Of course, there was no problem with multipath reflection interference or frequency drift, but QSB was more of a problem. PSK63 is much better except for handling multipath, and multipath destroys PSK31 copy much more often than on PSK63, so we are hoping for almost error-free copy using Domino. We'll know better over the next few weeks. Yesterday, at the local hamfest, I gave out a handfull of live CD's with Puppy Linux and fldigi on them for members to use for our tests on the 257 net. Some of us also already use Multipsk or Murray's Domino program, but I have customized fldigi to make it easier to use for inexperienced operators. If anyone reading this is within 150 miles of Charleston, SC or FM02, we meet at 8 PM on Wednesday and 9 PM on Sunday on 144.257, USB, around 1000 Hz tone frequency (144.258 MHz true RF frequency, in either PSK63 or Domino, so try to checkin with whichever mode you see on the waterfall. Our net is an informal ragchew net and usually goes on about an hour. It is very relaxing and a lot of fun! Antenna polarization is horizontal, or course, as is the convention for SSB or the low end of 2m. 73, Skip KH6TY
Re: [digitalradio] Re: An observation on Olivia
Skip, this is most interesting. I'll have to see if there is any local net like this in my Western New York/Southern Ontario area. Maybe I'll join your net when on IOP later this year. Andy K3UK On 2/3/07, Skip [EMAIL PROTECTED] wrote: Skip, Is this done with all-mode rigs are is it audio over FM? Leigh/WA5ZNU On Sat, 3 Feb 2007 12:38 pm, Skip wrote: Here in South Carolina, we are running a PSK63 net on 2-meters, Leigh, We are all using multimode rigs such as the IC-746, IC-706MKII, FT897, etc, using SSB and modulating with DominoEX 11 or PSK63. The point-to-point range is reliably over 100 miles, and one station that checks in regularly from 200 miles distant, lives on a 200 foot hill, and uses an 18 element beam on a 50 foot tower. The typical station is running 25 watts or less. Those outside of a 50 mile radius generally use 10 to 13 element beams. As Net Control, I simply retransmit all incoming text at 100 wpm, so all stations point their antennas at Net Control and I cut and paste what they have typed (at around 20 wpm) and retransmit at 100 wpm so nobody ever gets left out due to distance or location. Most stations within 30 miles can copy the other stations anyway. We started out over a year ago using audio over FM, but the point-to-point range was only about 30 miles. Of course, there was no problem with multipath reflection interference or frequency drift, but QSB was more of a problem. PSK63 is much better except for handling multipath, and multipath destroys PSK31 copy much more often than on PSK63, so we are hoping for almost error-free copy using Domino. We'll know better over the next few weeks. Yesterday, at the local hamfest, I gave out a handfull of live CD's with Puppy Linux and fldigi on them for members to use for our tests on the 257 net. Some of us also already use Multipsk or Murray's Domino program, but I have customized fldigi to make it easier to use for inexperienced operators. If anyone reading this is within 150 miles of Charleston, SC or FM02, we meet at 8 PM on Wednesday and 9 PM on Sunday on 144.257, USB, around 1000 Hz tone frequency (144.258 MHz true RF frequency, in either PSK63 or Domino, so try to checkin with whichever mode you see on the waterfall. Our net is an informal ragchew net and usually goes on about an hour. It is very relaxing and a lot of fun! Antenna polarization is horizontal, or course, as is the convention for SSB or the low end of 2m. 73, Skip KH6TY -- Andy K3UK Skype Me : callto://andyobrien73 www.obriensweb.com
Re: [digitalradio] Re: An observation on Olivia
Skip, Is this done with all-mode rigs are is it audio over FM? Leigh/WA5ZNU On Sat, 3 Feb 2007 12:38 pm, Skip wrote: Here in South Carolina, we are running a PSK63 net on 2-meters,
[digitalradio] Re: An observation on Olivia
--- In digitalradio@yahoogroups.com, expeditionradio [EMAIL PROTECTED] wrote: Are you tuned so that the phase scope is centered? What software are you using, and how do you have the threshold (squelch) set, and the allowable frequency drift? Bonnie VR2/KQ6XA Hong Kong, etc. The software is W1HKJ's fldigi. Guess I could have rebooted into Windows to try something else, but then I was getting perfect copy on one of the stations. Yes, they were both correctly tuned in and the squelch was turned off. I'm guessing there was some kind of ionospheric activity affecting one signal path and not the other. So I'm curious what kind of path activity can make such a mess of Olivia.
[digitalradio] Re: An observation on Olivia
--- In digitalradio@yahoogroups.com, KV9U [EMAIL PROTECTED] wrote: If the signal strength was about the same from both stations, then there could be ionospheric conditions that may be affecting the GA signal. Olivia is generally pretty resistant to most interference and the 16/500 mode uses the slower 31.25 baud rate which means the symbols are reasonably far apart for many 80 meter ISI problems, but it is possible that that path has severe multipath. I'm assuming that is the correct explanation. I'm reporting it just as a matter of interest, that here was one set of conditions that Olivia didn't handle well.
Re: [digitalradio] Re: An observation on Olivia
Multipath (ISI) or doppler can create such a mess... I have seen the same on 40 already Jose, CO2JA -- Original Message -- From: jhaynesatalumni [EMAIL PROTECTED] Reply-To: digitalradio@yahoogroups.com Date: Fri, 02 Feb 2007 17:32:28 - --- In digitalradio@yahoogroups.com, expeditionradio [EMAIL PROTECTED] wrote: Are you tuned so that the phase scope is centered? What software are you using, and how do you have the threshold (squelch) set, and the allowable frequency drift? Bonnie VR2/KQ6XA Hong Kong, etc. The software is W1HKJ's fldigi. Guess I could have rebooted into Windows to try something else, but then I was getting perfect copy on one of the stations. Yes, they were both correctly tuned in and the squelch was turned off. I'm guessing there was some kind of ionospheric activity affecting one signal path and not the other. So I'm curious what kind of path activity can make such a mess of Olivia. __ __ __ __ Correo enviado por ElectroMAIL. Facultad Eléctrica. CUJAE Dominio: electrica.cujae.edu.cu __ __ __ __ Correo enviado por ElectroMAIL. Facultad Eléctrica. CUJAE Dominio: electrica.cujae.edu.cu
Re: [digitalradio] Re: An observation on Olivia
Multipath (ISI) or doppler can create such a mess... I have seen the same on 40 already Jose, CO2JA -- Original Message -- From: jhaynesatalumni [EMAIL PROTECTED] Reply-To: digitalradio@yahoogroups.com Date: Fri, 02 Feb 2007 17:32:28 - --- In digitalradio@yahoogroups.com, expeditionradio [EMAIL PROTECTED] wrote: Are you tuned so that the phase scope is centered? What software are you using, and how do you have the threshold (squelch) set, and the allowable frequency drift? Bonnie VR2/KQ6XA Hong Kong, etc. The software is W1HKJ's fldigi. Guess I could have rebooted into Windows to try something else, but then I was getting perfect copy on one of the stations. Yes, they were both correctly tuned in and the squelch was turned off. I'm guessing there was some kind of ionospheric activity affecting one signal path and not the other. So I'm curious what kind of path activity can make such a mess of Olivia. __ __ __ __ Correo enviado por ElectroMAIL. Facultad Eléctrica. CUJAE Dominio: electrica.cujae.edu.cu
[digitalradio] Re: An observation on Olivia
--- In digitalradio@yahoogroups.com, jhaynesatalumni [EMAIL PROTECTED] I'm reporting it just as a matter of interest, that here was one set of conditions that Olivia didn't handle well. Actually, you haven't given enough information for it to be useful as a report of conditions. For it to be useful we would need to know the signal strength of both stations, your location, distance, time, the FoF2, decoder type, etc. Bonnie VR2/KQ6XA
[digitalradio] Re: An observation on Olivia
jhaynesatalumni wrote Right now I'm copying a QSO where the stations are using Olivia 16/500 on 80M. I'm in NW Arkansas, and the two stations in the QSO are in Florida and Georgia. I'm getting solid copy on the Florida station and extremely lousy copy on the Georgia station. (Presumably they are getting good copy on each other) Wonder why this is. Are you tuned so that the phase scope is centered? What software are you using, and how do you have the threshold (squelch) set, and the allowable frequency drift? Bonnie VR2/KQ6XA Hong Kong, etc.
