Hi All, After seeing the comment about 100mhz of unlicensed in the TVBD R&O I decided to ask some questions. I thought you guys might enjoy this exchange.
It's a bummer that John's going to retire. He wrote much of the part 15 rules that we operate under and has been a source of many answers over the years. I still remember the first time I talked to him. Had to be 2000 or so. I called to ask if I really couldn't swap an Andrew 16dB panel for a BreezeCOM one. It was, after all, the EXACT same thing except for the sticker! The sticker made all the difference, can't use an Andrew antenna with a BreezeCOM system. Thank God they changed that rule! I hope that John's replacement is even half as helpful as he has been. laters, marlon ----- Original Message ----- From: "John Reed" <[EMAIL PROTECTED]> To: "Marlon K. Schafer (509) 982-2181" <[EMAIL PROTECTED]> Sent: Thursday, November 20, 2008 4:38 AM Subject: RE: [isp-wireless] unlicensed under 2ghz These other bands operate with too narrow a bandwidth and/or at too low a power level to be useful for WLAN applications. For example, Section 12.223 permits operation in the 1.705-10 MHz band, excluding the restricted bands, but at an emission level that ranges from 15 to 100 uV/m at 30 m, equivalent to an EIRP along the lines of 7-300 nW; Section 15.229 permits operation in the 40.66-40.70 MHz band at an emission level of 1000 uV/m at 3 m, equivalent to an EIRP of 300 nW; Section 15.209 permits operation quite a few bands but at too low a power level, e.g., operation is permitted in the band 806-902 MHz at an emission level of 200 uV/m at 3 m, equivalent to an EIRP of 12 nW; Section 15.231 is limited to radio control and intermittent operations; etc. Most of the available bands below 2 GHz are not used by Part 15 devices for any purpose. Others are used for cordless telephones (remember the older 43/49 MHz systems), radio control, toys, wireless security alarms, auditory assistance, and other narrow band applications. It's only Sections 15.247 and 15.407 that give you the 4 W EIRP levels. The only other relatively "high" power provision below 2 GHz is under the UPCS rules in Subpart D of Part 15 for the 1920-1930 MHz band. -----Original Message----- From: Marlon K. Schafer (509) 982-2181 [mailto:[EMAIL PROTECTED] Sent: Wednesday, November 19, 2008 4:23 PM To: John Reed Subject: Re: [isp-wireless] unlicensed under 2ghz ----- Original Message ----- From: "John Reed" <[EMAIL PROTECTED]> To: "Marlon K. Schafer" <[EMAIL PROTECTED]> Sent: Wednesday, November 19, 2008 7:49 AM Subject: RE: [isp-wireless] unlicensed under 2ghz You're forgetting about Sections 15.209 and 15.217-15.243. There's actually quite a bit more than 100 MHz of unlicensed spectrum available below 2 GHz - basically everything except for the 15.205 restricted bands and the 54-70 MHz TV band. However, it's not necessarily compatible for WLAN applications. Remember, this was MSTV/NAB making this statement, not us. mks: So what are those unlicensed bands typically used for? Why wouldn't they work well for us? (Just making sure we're maximizing the resourses available to us....) (I haven't read the TV white spaces item. I'll be out of here, heading towards retirement, in about 3 weeks so I haven't been working on any of the newer projects.) mks: No way!!!!! What are you planning now? Consulting work or travel? grin mks: Thanks much for your help over the years John. You have been a Godsend. Take care and stay safe. Sincerely, Marlon K. Schafer ________________________________ From: Marlon K. Schafer [mailto:[EMAIL PROTECTED] Sent: Wed 11/19/2008 10:37 AM To: John Reed Subject: Fw: [isp-wireless] unlicensed under 2ghz Hi John, I'm calling uncle. I read in the Whitespaces NPRM that there is 100mhz of unlicensed under 2GHz. We can't find it though. Can you point to the bands and where I can find the rules that outline them? Thanks! marlon ----- Original Message ----- From: "Jaime Solorza" <[EMAIL PROTECTED]> To: <[EMAIL PROTECTED]> Sent: Wednesday, November 19, 2008 7:10 AM Subject: Re: [isp-wireless] unlicensed under 2ghz Lets see 26MHz in 902-928MHz ISM Band, 20Mhz in the 1910-1930MHz ISM Band, Thats 46MHz....the HAM guys have some 1.3GHz stuff that they might lose if they don't use it.. I believe 20Mhz in the 700Mhz will be set aside for unlicensed once the dust clears... Marlon K. Schafer wrote: > Hi All, > > In reading the FCC's TV whitespaces report and order I came across > this statement: > "Supporters of a licensed approach also hold that there is no need for > additional spectrum > > for unlicensed devices. In this regard, Qualcomm submits that there is > no evidence that consumers have > > had to return unlicensed devices because the unlicensed spectrum is > too crowded.48 The Association for > > Maximum Service Television and the National Association of > Broadcasters, in joint comments > > (MSTV/NAB), add there is over 100 megahertz of unlicensed spectrum > below 2 GHz and that 255 MHz > > of spectrum in the 5 GHz band was made available for unlicensed use in > 2003 and so there is plenty of > > spectrum available for unlicensed use.49 The White Space Coalition > counters these arguments, stating > > that the propagation characteristics of the TV band are superior to > the other unlicensed bands for many > > applications and that none of the other unlicensed spectrum is below > 900 MHz" > > > > Um, where is there 100mhz of unlicensed spectrum between 900mhz and 2 > gig? What's available that I haven't been using yet? > > marlon > > -------------------------------------------------------------------------------- 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/
