That's a very good idea on the transmit side. Remember that our AP
receivers will also need a VERY sharp filter ($$$) to keep the adjacent
channel TV signal from overloading it and reducing the reception range
to ****.
jack
Chuck McCown - 3 wrote:
> For adjacent channel use, we don't have to use a 6 MHz channel. We could
> use 5 or 4 or whatever it takes to make it work.
> ----- Original Message -----
> From: "Jack Unger" <[EMAIL PROTECTED]>
> To: "WISPA General List" <[email protected]>
> Sent: Wednesday, November 19, 2008 1:32 PM
> Subject: Re: [WISPA] TV Whitespaces
>
>
>
>> Directional antennas and other interference-avoidance techniques will
>> help but for mass-market use (which is how the vendors visualize the
>> TVWS) I suspect that it's going to be a long time before 1st adjacent
>> channel use will be practical. Still, gaining access to most of the
>> non-1st adjacent channels white space is still a big "win" for the WISP
>> industry.
>>
>> Chuck McCown wrote:
>>
>>> Hopefully forward error correction and directional antennas will make it
>>> possible.
>>>
>>> ----- Original Message -----
>>> From: "Jack Unger" <[EMAIL PROTECTED]>
>>> To: "WISPA General List" <[email protected]>
>>> Sent: Wednesday, November 19, 2008 1:19 PM
>>> Subject: Re: [WISPA] TV Whitespaces
>>>
>>>
>>>
>>>
>>>> Anything's possible but look at the shape of a DTV waveform and compare
>>>> it to the shape of an OFDM broadband wireless signal. Now look at the
>>>> space between those two waveforms if they are on adjacent channels. It's
>>>> kind of like putting two bricks side by side with no space in between.
>>>> Who is going to interfere with who the most? Looks like the DTV signals
>>>> will interfere with our AP receivers AND our CPE transmitters will
>>>> interfere with nearby television receivers. Of course, I could be
>>>> wrong.... What's your take on it?
>>>>
>>>> Chuck McCown wrote:
>>>>
>>>>
>>>>> Perhaps once TVWS gets used and it proves a success, then they will
>>>>> open
>>>>> up
>>>>> adjacent channels.
>>>>> Once they do that there will be holes everywhere.
>>>>>
>>>>> ----- Original Message -----
>>>>> From: "Jack Unger" <[EMAIL PROTECTED]>
>>>>> To: "WISPA General List" <[email protected]>
>>>>> Sent: Wednesday, November 19, 2008 12:58 PM
>>>>> Subject: Re: [WISPA] TV Whitespaces
>>>>>
>>>>>
>>>>>
>>>>>
>>>>>
>>>>>> Joe,
>>>>>>
>>>>>> The White Spaces are the unused television channels. In most major
>>>>>> metro
>>>>>> areas, many of the channels are in use by television broadcasters and
>>>>>> other licensed users. Outside of major metro areas, there will be
>>>>>> unused
>>>>>> channels available that you can use. In general, the more rural you
>>>>>> are,
>>>>>> the more channels will be available.
>>>>>>
>>>>>> jack
>>>>>>
>>>>>>
>>>>>> Joe Laura wrote:
>>>>>>
>>>>>>
>>>>>>
>>>>>>> Am I hearing correctly that this new space can only be utilized in
>>>>>>> rural
>>>>>>> areas? Not for Citys like New Orleans? TIA
>>>>>>> Joe Laura
>>>>>>> Superior Alarm/Wireless
>>>>>>> New Orleans,La.
>>>>>>> www.superior1.com
>>>>>>> ----- Original Message -----
>>>>>>> From: Blair Davis
>>>>>>> To: WISPA General List
>>>>>>> Sent: Monday, November 17, 2008 5:47 PM
>>>>>>> Subject: Re: [WISPA] TV Whitespaces
>>>>>>>
>>>>>>>
>>>>>>> Ubquity? Some kind of mini-pci card?
>>>>>>>
>>>>>>> Charles Wyble wrote:
>>>>>>> Mike Hammett wrote:
>>>>>>> Now that TV whitespaces have been approved for our use, let's hear
>>>>>>> from
>>>>>>> the vendors. When, how much, and what will you do with it?
>>>>>>>
>>>>>>>
>>>>>>> Indeed!
>>>>>>>
>>>>>>> Who would the likely vendors in this space be?
>>>>>>>
>>>>>>> Should we put an RFP together and send it around? I sure want
>>>>>>> answers
>>>>>>> to your questions as well.
>>>>>>>
>>>>>>>
>>>>>>> Ladies and gents: I haven't read all of the published information
>>>>>>> yet,
>>>>>>> but this is the second greatest battle we have come across (second
>>>>>>> only
>>>>>>> to having unlicensed available in the first place) and we have won!
>>>>>>> Congrats. It appears the portable devices are held to 100 mw of
>>>>>>> power,
>>>>>>> while we have 4 watts (which is pretty much what we have everywhere
>>>>>>> else). Four watts at these frequencies will carry!
>>>>>>>
>>>>>>>
>>>>>>> Yep!
>>>>>>>
>>>>>>>
>>>>>>>
>>>>>>>
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>>>>>>>
>>>>>> --
>>>>>> Jack Unger - President, Ask-Wi.Com, Inc.
>>>>>> Serving the Broadband Wireless Industry Since 1993
>>>>>> Cisco Press Author - "Deploying License-Free Wireless WANs"
>>>>>> WISPs - Do you know where your customers are?
>>>>>> For wireless coverage mapping see http://www.ask-wi.com/mapping
>>>>>> FCC Lic. #PG-12-25133 LinkedIn Profile
>>>>>> <http://www.linkedin.com/in/jackunger>
>>>>>> Phone 818-227-4220 Email <[EMAIL PROTECTED]>
>>>>>>
>>>>>>
>>>>>>
>>>>>>
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>>>> --
>>>> Jack Unger - President, Ask-Wi.Com, Inc.
>>>> Serving the Broadband Wireless Industry Since 1993
>>>> Cisco Press Author - "Deploying License-Free Wireless WANs"
>>>> WISPs - Do you know where your customers are?
>>>> For wireless coverage mapping see http://www.ask-wi.com/mapping
>>>> FCC Lic. #PG-12-25133 LinkedIn Profile
>>>> <http://www.linkedin.com/in/jackunger>
>>>> Phone 818-227-4220 Email <[EMAIL PROTECTED]>
>>>>
>>>>
>>>>
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>> --
>> Jack Unger - President, Ask-Wi.Com, Inc.
>> Serving the Broadband Wireless Industry Since 1993
>> Cisco Press Author - "Deploying License-Free Wireless WANs"
>> WISPs - Do you know where your customers are?
>> For wireless coverage mapping see http://www.ask-wi.com/mapping
>> FCC Lic. #PG-12-25133 LinkedIn Profile
>> <http://www.linkedin.com/in/jackunger>
>> Phone 818-227-4220 Email <[EMAIL PROTECTED]>
>>
>>
>>
>>
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>
>
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--
Jack Unger - President, Ask-Wi.Com, Inc.
Serving the Broadband Wireless Industry Since 1993
Cisco Press Author - "Deploying License-Free Wireless WANs"
WISPs - Do you know where your customers are?
For wireless coverage mapping see http://www.ask-wi.com/mapping
FCC Lic. #PG-12-25133 LinkedIn Profile <http://www.linkedin.com/in/jackunger>
Phone 818-227-4220 Email <[EMAIL PROTECTED]>
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