The current rules permit multiplexed non phone emission on 6 meters (above 50.1 MHz) and 2 meters (above 144.1 MHz) and they could be multiplexed image and phone if I understand the regulations properly. A quality A3E emission would be an AM signal and that can be fairly broad.
/(2) No non-phone emission shall exceed the bandwidth of a communications quality phone emission of the same modulation type. The total bandwidth of an independent sideband emission (having B as the first symbol), or a multiplexed image and phone emission, shall not exceed that of a communications quality A3E emission./ When some SSTV hams moved from analog image, to the more recent digital image modulation schemes (RDFT and now more QAM), it was accepted by the FCC as being comparable because of the underlying mode being transmitted, namely image. Under the new proposed regulations by bandwidth, which I once thought would be a solution, the new proposals do not necessarily permit any modulation scheme or mode based upon bandwidth. Dave Sumner, ARRL CEO, wrote some time back in his "It seems to us", editorial column, that they still want some segregation of the modes too. For example, they do not want digital voice to be mixed in with analog voice, even though they might be the same channel width. At this time you can transmit either analog or digital voice in a voice portion of the bands. In fact, on 160 meters all modes, digital or analog can be used anywheres in terms of FCC regulations (but not necessarily the suggested bandplans). If the new proposed regulations went into effect, there would still be bandplans that would segregate modes. This would be done to satisfy what some would consider good operating practices and they would very likely place digital modes in a different area from analog modes of the same bandwidth. I am skeptical that digital voice will ever be quite as good as analog voice for weak signal situations (in real time), so the one thing that I wanted the most is to have the ability to send analog voice and be able to switch to digital transmissions as well, both for voice and data. This may not be possible under the new proposals that the FCC is contemplating at this time. 73, Rick, KV9U Paul L Schmidt wrote: >But if it's a digitally-compressed data stream that just happens >to be carrying video (it *could* be anything, right?) which is it? > >The regs were written back when life was much simpler. Image meant >you used a video camera or a fax scanner, and fed that analog >data into some kind of a modulator. To receive, you ran it >through a demodulator and either put it to some kind of a >fax output or to a CRT... anyone remember those long-persistence >phosphor CRT's they used to use for SSTV? > >Those regulations don't make sense any more. > >That's why we need regulation by bandwidth. > >WHoever it was that combined the issue of regulation by bandwidth with >automatic control did a *MAJOR* dis-service to ham radio. > >OK, so I'll say it... whoever the IDIOT was that combined the two >issues did a major dis-service to ham radio. > >- ps > >Leigh L Klotz, Jr. wrote: > > >>Doesn't it also say in (2) that the maximum bandwidth for an image is >>the equivalent of a communications-quality phone emission? That would >>be less than 20KHz...it is a pain that they consider image and data >>differently, which is certainly one reason to support some kind of >>mode/bandwidth reform. >>Leigh/WA5ZNU >>On Fri, 9 Jun 2006 4:44 pm, KV9U wrote: >> >> >> >>>Paul is correct, the maximum bandwidth permitted on 2 meters is 20 kHz >>>... at this time. >>> >>> >>> > > > >Need a Digital mode QSO? Connect to Telnet://cluster.dynalias.org > >Other areas of interest: > >The MixW Reflector : http://groups.yahoo.com/group/themixwgroup/ >DigiPol: http://groups.yahoo.com/group/Digipol (band plan policy discussion) > > >Yahoo! Groups Links > > > > > > > > > > > ------------------------ Yahoo! Groups Sponsor --------------------~--> Everything you need is one click away. Make Yahoo! your home page now. http://us.click.yahoo.com/AHchtC/4FxNAA/yQLSAA/ELTolB/TM --------------------------------------------------------------------~-> Need a Digital mode QSO? Connect to Telnet://cluster.dynalias.org Other areas of interest: The MixW Reflector : http://groups.yahoo.com/group/themixwgroup/ DigiPol: http://groups.yahoo.com/group/Digipol (band plan policy discussion) Yahoo! Groups Links <*> To visit your group on the web, go to: http://groups.yahoo.com/group/digitalradio/ <*> To unsubscribe from this group, send an email to: [EMAIL PROTECTED] <*> Your use of Yahoo! Groups is subject to: http://docs.yahoo.com/info/terms/
