Robert, I disagree that 470 MHz is an ISM band in the US - according to paper page 497 of the 2010 Title 47 CFR Part 2.106, 470 MHz straddles the boundary between several non-ISM allocations. The first column of that chart is for international allocations and the second in for US allocations. I agree there are several low-power devices in there, but not traditional ISM stuff. With regard to other uses of freqs around 470 MHz, there is a whole slew of footnotes relating to the 470+-MHz band starting on paper page 551 with footnote 5.289 that states: 5.289 Earth exploration-satellite service applications, other than the meteorological- satellite service, may also be used in the bands 460–470 MHz and 1690–1710 MHz for space-to-Earth transmissions subject to not causing harmful interference to stations operating in accordance with the Table. Subsequent footnotes show that many countries in that area use the 470+ MHz band for Space-to-Earth comms. It's interesting to note the the DPRK is mentioned 14 times in a US Federal Code document (search for 'of Korea'). Link to PDF: http://www.gpo.gov/fdsys/pkg/CFR-2010-title47-vol1/pdf/CFR-2010-title47-vol1-sec2-106.pdf -- David Tiller Lead Consultant/Architect | CapTech (804) 304-0638 | dtiller@captechconsulting.com ________________________________________ From: seesat-l-bounces+dtiller=captechconsulting.com@satobs.org [seesat-l-bounces+dtiller=captechconsulting.com@satobs.org] on behalf of Robert Knight [theknightreport@gmail.com] Sent: Thursday, April 12, 2012 2:36 PM To: seesat-l@satobs.org Cc: ssl3molcz@rogers.com Subject: Re: North Korea satellite: search elements In the United States, 470 MHz is part of the unlicensed “ISM” (Industrial, Scientific and Medical) band -- often used for such protocols as WiFi, Bluetooth, Z-Wave, *etc.* It’s also referred to as a “TV white space,” or unused television broadcasting frequency. However, in the DPRK (“North Korea”), the 470 MHz frequency has been adopted by the Korea Communications Commission as a digital TV frequency, corresponding to DPRK’s digital channel 14, part of a new nationwide television service. Hence, Pyongyang’s announced plan to *“broadcast revolutionary songs at 470 MHz,”* [thereby theoretically accessible to North Korean television consumers] is – on the face of it – *eminently plausible*, IMHO. * * *-Robert Knight Senior National Correspondent ** **"Five O'Clock Shadow" *WBAI . 99.5FM . wbai.org * * On Thu, Apr 12, 2012 at 1:22 PM, <kd6nrp@earthlink.net> wrote: > Good Morning: > > I wonder if the 470 MHz region of the radio spectrum is heavily used in > South Korea, China, or Japan. If 470 MHz is heavily used in the region, it > would cast some doubt on North Korea's claim that they are launching a > satellite. > > After all, you would want to select a quiet portion of the spectrum for > the satellite downlink to make the signal easier to hear. > > If this is an ICBM test, it is logical to assume that the North Koreans > would want to collect engineering data (radar tracking information, > telemetry, and so on) during the entire flight in order to assess the > vehicle's performance. > > Have there been any reports of North Korean range support ships or > trawlers being seen downrange? A logical location for such a ship would be > near the third stage impact area or a potential payload splash point. > > Regards, > > Brian Webb > > -----Original Message----- > >From: Martyn Williams <martyn@gmail.com> > >Sent: Apr 12, 2012 9:00 AM > >To: Ted Molczan <ssl3molcz@rogers.com> > >Cc: seesat-l@satobs.org > >Subject: Re: North Korea satellite: search elements > > > >Ted, > > > >Subsequent to the original announcement, the North Koreans said the > >satellite will also broadcast revolutionary songs "at 470MHz." > > > >This is the same intention that was made last time. A more precise > >frequency wasn't mentioned. > > > >Martyn > > > >> The payload reportedly carries UHF and X-band transmitters. If anyone > has reliable information on its precise radio > >> transmission frequencies, or advice on the most likely frequency > ranges, please feel free to share via the list. > > > > > >-- > >Martyn Williams > >2012 Knight Journalism Fellow > >Stanford University > >_______________________________________________ > >Seesat-l mailing list > >http://mailman.satobs.org/mailman/listinfo/seesat-l > > _______________________________________________ > Seesat-l mailing list > http://mailman.satobs.org/mailman/listinfo/seesat-l > -------------- next part -------------- An HTML attachment was scrubbed... URL: http://mailman.satobs.org/mailman/private/seesat-l/attachments/20120412/78d82a12/attachment.html _______________________________________________ Seesat-l mailing list http://mailman.satobs.org/mailman/listinfo/seesat-l _______________________________________________ Seesat-l mailing list http://mailman.satobs.org/mailman/listinfo/seesat-l
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