Now I'm really confused. I thought I had it straight in my head, after slogging through all the info in the ARRL posts, etc., that we would NOT be able to have more than one PSK (or CW) QSO going on in a given channel, because we are required to always put the one PSK or CW signal at the same offset within that channel.
I remember being disappointed in the idea that we wouldn't be able to use a single channel or two as a virtual CW or PSK "mini-band", thus making much more efficient use of the limited spectrum being made available to us. The conclusion I reached was that even if that would be the most efficient use of the spectrum, that it would likely drive the primary users nuts trying to figure out how to shut up a whole crowd of users when they wanted to use the channel, thus the reason for barring us from stuffing the channel with multiple narrow-band signals. Did I somehow misread the whole thing? Thanks, -- Dave, N8SBE On 2/3/2012 10:58 PM, Sandy wrote: > Firstly, if you read the Summary of the R&O, it specifically states that for > FSK emission designator is: 60H0J2D. 60 Hz being the bandwidth of the PSK > emissions. Under ideal conditions, I would suppose that about 1.5 khz of > space would be usable at least with a normal SSB transceiver on PSK-31. If > the tones are much below 0.5khz you run into some distortion that seems to > prevail on some transceivers and cause spurious signals, ditto above 2 khz. > No doubt some rigs might work OK, some might not. Still several > simultaneous QSO's could be accommodated in say a 1.5 =2 khz bandwidth with > no problem if there wasn't a "Power hog" trying to outdo everyone else on > the channel. One MUST be a "Good neighbor" and not run excessive power > (even under the 100w PEP ERP requirement) in order for everyone to have his > QSO with adjoining stations operating. A "normal" RTTY station would be > much broader than allowed by the emission designator. PSK-31 can be a very > delightful and reliable mode but one "Lid" can wreck a whole band of PSK > channels using 2 khz of band space. 97.307 specifically assigns the 60H0J2B > bandwidth designator in the addition/revision rules in the Federal Register > for part 97. So it seems that PSK-31 WOULD be able to use more than one > QSO in the channel space allotted per channel as long as there wasn't any > spurious "crud" outside or inside the assigned channel. Most of the > waterfall displays have frequency calibrations which can be very close if > one sets up his transceiver's frequency correctly. The space used by each > user of PSK-31 is limited to what the "emission designator" specifies and > not the 2.8 khz bandwidth as is specified for PACTOR data. Being much > narrower than PACTOR several PSK-31 co-users should be possible per channel. > > For CW the R&O also says the CW signal will be 1.5 Khz above the suppressed > carrier frequency used by the USB mode and one would assume that it would > have to be within + or - 75 Hz of that center frequency. This would pretty > much limit each channel to one CW QSO per channel at any one time. > (emission designator for CW is: 150HA1A) > > Just an observation. We will find out what happens when March 5th comes and > the new emissions are tried out. There probably WILL be some growing pains > and also "newbies" who don't understand the problems that will pop up in > "channelized" spectrum space in ham radio. > > I'm looking forward to operating both CW (and PSK-31 eventually when I get > my interface for the FT-990 xcvr built) It should be fun and very useful > having these additions to just voice modes on 60 meters! > > 73, > > Sandy W5TVW > > > -----Original Message----- > From: Rick Bates > Sent: Friday, February 03, 2012 9:14 PM > To: 'Sandy' > Cc: elecraft@mailman.qth.net > Subject: RE: [Elecraft] FCC 60m Band Change Rules Published > InFederalRegister On 03 February 2012 - Correction > > Hi Sandy, > > If I read it correctly, we can use RTTY, Pactor and PSK modes (using USB if > AFSK) and are limited to 2.8 KHz. It said we were NOT limited to those > modes for data as it would suppress experimentation. > > Since PSK is usually sound card based, keeping everything within the > required 2.8 KHz means there will be less space (than say 14.07 MHz) for > shared channel use. > > The one caveat I see is if one uses the FSK (or PSK in a K3) mode of the > radio. You have to know if it is displaying the suppressed carrier > frequency OR is it displaying the MARK frequency and adjust accordingly? > > For CW, use the channel center frequency (up 1500 Hz from the suppressed > carrier frequency). > > Comments? > > Rick WA6NHC > > -----Original Message----- > From: Sandy > > Hey guys! > > I am planning on trying CW for the first time on 60 meters on the new > channel 3 on 5358.5. Just hope the PACTOR stuff doesn't jump on that > channel and "claim" it. > > It looks like there isn't ANY "normal" RTTY authorized, only PSK31. It > would be hard to run "normal" RTTY with only a 60 Hz. bandwidth. > > 73, > > Sandy W5TVW > > > > ----- > No virus found in this message. > Checked by AVG - www.avg.com > Version: 2012.0.1913 / Virus Database: 2112/4786 - Release Date: 02/03/12 > > ______________________________________________________________ > Elecraft mailing list > Home: http://mailman.qth.net/mailman/listinfo/elecraft > Help: http://mailman.qth.net/mmfaq.htm > Post: mailto:Elecraft@mailman.qth.net > > This list hosted by: http://www.qsl.net > Please help support this email list: http://www.qsl.net/donate.html ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
