Re: [WISPA] Additional TVWS factors
At 9/25/2010 10:57 AM, MikeH wrote: Does my memory serve me correctly that channels 3, 4, and 37 are out of the picture for use? Yes. 3 and 4 are reserved because cable systems and other devices use them for the analog feed to TV sets. (The FCC forgot this several years ago and gave a temporary license to an LPTV station to operate on Channel 3 from a tower right near my house. It knocked out my cable boxes and VCRs. I let the FCC know, in no uncertain terms, that this violated a rule, which I cited, and that station went off the air within a day or so.) Channel 37 is clear for radio astronomy, and allows low-powered medical devices. Some metropolitan areas use parts of 14 - 20 for public safety communications, right? Yes; they're in the database and named in the rules. Do the above channels ALSO need a guard band, making 2 impossible to use and 5 the first real channel you can use? Are 36 and 38 out the window? One channel on either side of the public safety channel(s)? 2 and 5 are not protected, though some cable interests are unhappy about it. 36 and 38 are not protected per se. However, channels 14-20 are only usable for portable devices, which basically means wireless mics. In markets where those are used for public safety, the first white channel on either side of 38 is reserved for wireless mics. -- Fred Goldsteink1io fgoldstein at ionary.com ionary Consulting http://www.ionary.com/ +1 617 795 2701 WISPA Wants You! Join today! http://signup.wispa.org/ WISPA Wireless List: wireless@wispa.org Subscribe/Unsubscribe: http://lists.wispa.org/mailman/listinfo/wireless Archives: http://lists.wispa.org/pipermail/wireless/
Re: [WISPA] Additional TVWS factors
3 and 4 are reserved... where did you get this from??? WWMT 3 was high power analog in Kalamazoo, MI WDIV 4 was high power analog in Detroit, MI There were many others... Fred Goldstein wrote: At 9/25/2010 10:57 AM, MikeH wrote: Does my memory serve me correctly that channels 3, 4, and 37 are out of the picture for use? Yes. 3 and 4 are reserved because cable systems and other devices use them for the analog feed to TV sets. (The FCC forgot this several years ago and gave a temporary license to an LPTV station to operate on Channel 3 from a tower right near my house. It knocked out my cable boxes and VCRs. I let the FCC know, in no uncertain terms, that this violated a rule, which I cited, and that station went off the air within a day or so.) Channel 37 is clear for radio astronomy, and allows low-powered medical devices. Some metropolitan areas use parts of 14 - 20 for public safety communications, right? Yes; they're in the database and named in the rules. Do the above channels ALSO need a guard band, making 2 impossible to use and 5 the first real channel you can use? Are 36 and 38 out the window? One channel on either side of the public safety channel(s)? 2 and 5 are not protected, though some cable interests are unhappy about it. 36 and 38 are not protected per se. However, channels 14-20 are only usable for "portable" devices, which basically means wireless mics. In markets where those are used for public safety, the first white channel on either side of 38 is reserved for wireless mics. -- Fred Goldsteink1io fgoldstein "at" ionary.com ionary Consulting http://www.ionary.com/ +1 617 795 2701 WISPA Wants You! Join today! http://signup.wispa.org/ WISPA Wireless List: wireless@wispa.org Subscribe/Unsubscribe: http://lists.wispa.org/mailman/listinfo/wireless Archives: http://lists.wispa.org/pipermail/wireless/ WISPA Wants You! Join today! http://signup.wispa.org/ WISPA Wireless List: wireless@wispa.org Subscribe/Unsubscribe: http://lists.wispa.org/mailman/listinfo/wireless Archives: http://lists.wispa.org/pipermail/wireless/
Re: [WISPA] Additional TVWS factors
At 9/25/2010 08:43 PM, BlairD wrote: 3 and 4 are reserved... where did you get this from??? WWMT 3 was high power analog in Kalamazoo, MI WDIV 4 was high power analog in Detroit, MI There were many others... Yes, but because they were adjacent, only one of the two was in use in any given market. Therefore it was a safe bet that one of the two would be white, and thus usable for the analog feed to a TV set. So devices with analog TV output, ranging from VCRs to game consoles, usually have a switch to choose between channels 3 and 4. -- Fred Goldsteink1io fgoldstein at ionary.com ionary Consulting http://www.ionary.com/ +1 617 795 2701 WISPA Wants You! Join today! http://signup.wispa.org/ WISPA Wireless List: wireless@wispa.org Subscribe/Unsubscribe: http://lists.wispa.org/mailman/listinfo/wireless Archives: http://lists.wispa.org/pipermail/wireless/
Re: [WISPA] Additional TVWS factors
Is anyone consulting the database search tool on the Spectrum Bridge website? Is it of any value? Put in a zip code and it shows you all the channels and what is and is not available, and has a legend which includes the reason for any reserved ones. Any comment on how accurate and/or valuable this is? Dave Hannum New Era Broadband, LLC On Sat, Sep 25, 2010 at 9:07 PM, Fred Goldstein fgoldst...@ionary.comwrote: At 9/25/2010 08:43 PM, BlairD wrote: 3 and 4 are reserved... where did you get this from??? WWMT 3 was high power analog in Kalamazoo, MI WDIV 4 was high power analog in Detroit, MI There were many others... Yes, but because they were adjacent, only one of the two was in use in any given market. Therefore it was a safe bet that one of the two would be white, and thus usable for the analog feed to a TV set. So devices with analog TV output, ranging from VCRs to game consoles, usually have a switch to choose between channels 3 and 4. -- Fred Goldsteink1io fgoldstein at ionary.com ionary Consultinghttp://www.ionary.com/ +1 617 795 2701 WISPA Wants You! Join today! http://signup.wispa.org/ WISPA Wireless List: wireless@wispa.org Subscribe/Unsubscribe: http://lists.wispa.org/mailman/listinfo/wireless Archives: http://lists.wispa.org/pipermail/wireless/ WISPA Wants You! Join today! http://signup.wispa.org/ WISPA Wireless List: wireless@wispa.org Subscribe/Unsubscribe: http://lists.wispa.org/mailman/listinfo/wireless Archives: http://lists.wispa.org/pipermail/wireless/
Re: [WISPA] Additional TVWS factors
I would use the interactive map rather than search by zip code. With the interactive map you can zoom in to the area of interest and then turn the specific channel contour maps on and off at will. Much easier to visualize the availability than looking at that report. There is still some question in my mind about certain channels and the adjacent protections. For instance there is a jump in frequency between channels 13 and 14 of over 250 MHz. It would seem silly to have to protect adjacent channels between those two. There is a similar situation between channel 6 and 7. I'm working on a revised Google Earth file that is similar to the spectrum bridge web site. I'll post it when I am done. There map server seems to be loaded pretty heavily and slow to respond lately J Thank You, Brian Webster www.wirelessmapping.com www.Broadband-Mapping.com From: wireless-boun...@wispa.org [mailto:wireless-boun...@wispa.org] On Behalf Of David Hannum Sent: Saturday, September 25, 2010 9:14 PM To: WISPA General List Subject: Re: [WISPA] Additional TVWS factors Is anyone consulting the database search tool on the Spectrum Bridge website? Is it of any value? Put in a zip code and it shows you all the channels and what is and is not available, and has a legend which includes the reason for any reserved ones. Any comment on how accurate and/or valuable this is? Dave Hannum New Era Broadband, LLC On Sat, Sep 25, 2010 at 9:07 PM, Fred Goldstein fgoldst...@ionary.com wrote: At 9/25/2010 08:43 PM, BlairD wrote: 3 and 4 are reserved... where did you get this from??? WWMT 3 was high power analog in Kalamazoo, MI WDIV 4 was high power analog in Detroit, MI There were many others... Yes, but because they were adjacent, only one of the two was in use in any given market. Therefore it was a safe bet that one of the two would be white, and thus usable for the analog feed to a TV set. So devices with analog TV output, ranging from VCRs to game consoles, usually have a switch to choose between channels 3 and 4. -- Fred Goldsteink1io fgoldstein at ionary.com http://ionary.com/ ionary Consultinghttp://www.ionary.com/ +1 617 795 2701 WISPA Wants You! Join today! http://signup.wispa.org/ WISPA Wireless List: wireless@wispa.org Subscribe/Unsubscribe: http://lists.wispa.org/mailman/listinfo/wireless Archives: http://lists.wispa.org/pipermail/wireless/ WISPA Wants You! Join today! http://signup.wispa.org/ WISPA Wireless List: wireless@wispa.org Subscribe/Unsubscribe: http://lists.wispa.org/mailman/listinfo/wireless Archives: http://lists.wispa.org/pipermail/wireless/
Re: [WISPA] Additional TVWS factors
The gap between 6 and 7 is used by marine air search radar. If you are on the coast, you wouldn't want to be there. Phil On Sat, Sep 25, 2010 at 7:44 PM, Brian Webster bwebs...@wirelessmapping.com wrote: I would use the interactive map rather than search by zip code. With the interactive map you can zoom in to the area of interest and then turn the specific channel contour maps on and off at will. Much easier to visualize the availability than looking at that report. There is still some question in my mind about certain channels and the adjacent protections. For instance there is a jump in frequency between channels 13 and 14 of over 250 MHz. It would seem silly to have to protect adjacent channels between those two. There is a similar situation between channel 6 and 7. I’m working on a revised Google Earth file that is similar to the spectrum bridge web site. I’ll post it when I am done. There map server seems to be loaded pretty heavily and slow to respond lately J Thank You, Brian Webster www.wirelessmapping.com www.Broadband-Mapping.com *From:* wireless-boun...@wispa.org [mailto:wireless-boun...@wispa.org] *On Behalf Of *David Hannum *Sent:* Saturday, September 25, 2010 9:14 PM *To:* WISPA General List *Subject:* Re: [WISPA] Additional TVWS factors Is anyone consulting the database search tool on the Spectrum Bridge website? Is it of any value? Put in a zip code and it shows you all the channels and what is and is not available, and has a legend which includes the reason for any reserved ones. Any comment on how accurate and/or valuable this is? Dave Hannum New Era Broadband, LLC On Sat, Sep 25, 2010 at 9:07 PM, Fred Goldstein fgoldst...@ionary.com wrote: At 9/25/2010 08:43 PM, BlairD wrote: 3 and 4 are reserved... where did you get this from??? WWMT 3 was high power analog in Kalamazoo, MI WDIV 4 was high power analog in Detroit, MI There were many others... Yes, but because they were adjacent, only one of the two was in use in any given market. Therefore it was a safe bet that one of the two would be white, and thus usable for the analog feed to a TV set. So devices with analog TV output, ranging from VCRs to game consoles, usually have a switch to choose between channels 3 and 4. -- Fred Goldsteink1io fgoldstein at ionary.com ionary Consultinghttp://www.ionary.com/ +1 617 795 2701 WISPA Wants You! Join today! http://signup.wispa.org/ WISPA Wireless List: wireless@wispa.org Subscribe/Unsubscribe: http://lists.wispa.org/mailman/listinfo/wireless Archives: http://lists.wispa.org/pipermail/wireless/ WISPA Wants You! Join today! http://signup.wispa.org/ WISPA Wireless List: wireless@wispa.org Subscribe/Unsubscribe: http://lists.wispa.org/mailman/listinfo/wireless Archives: http://lists.wispa.org/pipermail/wireless/ WISPA Wants You! Join today! http://signup.wispa.org/ WISPA Wireless List: wireless@wispa.org Subscribe/Unsubscribe: http://lists.wispa.org/mailman/listinfo/wireless Archives: http://lists.wispa.org/pipermail/wireless/
