This is indeed an interesting summary of upcoming deadlines for land mobile narrowbanding. These same bandwidths apply to broadcast auxiliary equipment, with some differences (narrowband channel stacking being the main one) and to some Federal government radio equipment. However, it should be noted for those planning or considering Amateur narrowbanding that the FCC first started talking about this narrowbanding plan, first from 25 kHz to 12.5 kHz as an interim step and then ultimately to 6.25 kHz, back in 1992! And there is still a petition on file to delay even the 12.5 kHz narrobanding deadline for manufacturers filed by NPSTC (on whose board we have a seat). There is still no 6.25 kHz conversion deadline for licensees. So, if the land mobile service is to be used as a model for Amateur narrowband planning, the Amateur planners might consider a timetable that takes into account the resistance of the incumbents to changes in the status quo; the useful life of wideband equipment; and the cost of multimode equipment during any phased-in transition. I have the background documentation all assembled here for anyone who cares to review the sausagemaking that went into this. It wasn't always good sausage.... 73, Chris W3KD Christopher D. Imlay Booth, Freret, Imlay & Tepper. P.C. 14356 Cape May Road Silver Spring, Maryland 20904-6011 (301) 384-5525 telephone (301) 384-6384 facsimile W3KD@ARRL.ORG -----Original Message----- From: Sumner, Dave, K1ZZ <dsumner@arrl.org> To: arrl-odv <arrl-odv@reflector.arrl.org> Sent: Mon, Dec 14, 2009 2:07 pm Subject: [arrl-odv:18317] Land mobile narrowbanding At Minute 29 of the July Board Meeting a resolution was adopted creating a study committee “for the purpose of research and to consider developing a plan to move the US amateur community to narrowband channel spacing.” The resolution was premised in part upon the FCC mandate for narrowbanding in commercial two-way radio services. Attached is an FCC Public Notice explaining narrowbanding as it applies to Industrial/Business and Public Safety Radio Pool licensees. Of course, these rules do not apply to the Amateur Radio Service but it may be helpful to know about them. 73, Dave K1ZZ <<DA-09-2589A1.pdf>>