Thanks.  at 18 GHz, a Class B should be fine.
----- Original Message ----- 
From: "Charles Wu" <[EMAIL PROTECTED]>
To: "WISPA General List" <wireless@wispa.org>
Sent: Monday, July 14, 2008 2:44 PM
Subject: Re: [WISPA] Dragonwave antenna pattern for RM


> To summarize, it details to the amount of interference you are willing to 
> accept on your system
>
> That said, for "standard" operations in Part 101, due to the fact that the 
> rules were written back in the early 90s for analogue microwave systems, 
> the interference threshold of a licensed system can be summarized as 
> follows (keep in mind, you can easily poke holes into my response, so bear 
> with this oversimplification)
>
> Part 101 Interference Threshold is ~40 dB BELOW the minimum threshold of 
> your licensed modulation
>
> That said...say I have a radio that as a result of operating at 64 QAM, 
> has a minimum receive threshold of -68 dBm
> Chances are, when I build the link, I will plan for some amount of fade 
> margin (say 30 dB here), so my nominal receive threshold for the link 
> is -38 dBi
> That said, when I'm talking about this 40 dB buffer, I'm talking 40 dB 
> below the MINIMUM threshold, so if I were to license a system in the area 
> on the same channel, the co-channel noise that I would be able to pick up 
> from you must be 40 dB BELOW -68, or ~ -108 dBm
>
> In this particular situation, if you were running in 11 GHz, as a result 
> of using a 2' dish, you may change the allowable "interferable" noise flow 
> from -108 (40 dB below -68) ro -78 (40 dB below -38)
>
> Again, in the unlicensed world, 10-15 dB above the noise floor is 
> considered to be pretty good -- anything above that with some level of 
> protection is incredible, and in the lower bands (!1 & 6 GHz) where it may 
> be hard to fit a system in a geographical area at a specific 
> interference/noise level, taking in an extra 10-20 dB of noise (when I've 
> got 60+ dB of fade margin) isn't too much of an issue
>
> -Charles
>
> -------------------------------------------
> WiNOG Wireless Roadshows
> Coming to a City Near You
> http://www.winog.com
>
>
> -----Original Message-----
> From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On 
> Behalf Of Chuck McCown - 3
> Sent: Monday, July 14, 2008 1:18 PM
> To: WISPA General List
> Subject: Re: [WISPA] Dragonwave antenna pattern for RM
>
> Could you please elaborate about a Class B?  This is new to me.
>
> ----- Original Message -----
> From: "Charles Wu" <[EMAIL PROTECTED]>
> To: "WISPA General List" <wireless@wispa.org>
> Sent: Monday, July 14, 2008 12:14 PM
> Subject: Re: [WISPA] Dragonwave antenna pattern for RM
>
>
>> Actually...if you're willing to accept Class B status under Part 101, you
>> can even get a 2' in 11 GHz
>>
>> NOTE: Class B is still MILES ahead of anything unlicensed
>>
>> -Charles
>>
>> -------------------------------------------
>> WiNOG Wireless Roadshows
>> Coming to a City Near You
>> http://www.winog.com
>>
>>
>> -----Original Message-----
>> From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On
>> Behalf Of Mike Brownson
>> Sent: Friday, July 11, 2008 12:31 AM
>> To: WISPA General List
>> Subject: Re: [WISPA] Dragonwave antenna pattern for RM
>>
>> Correct.  Normally 4 ft is the standard.  But in most areas of the 
>> country
>> you can request an exception and go down to a 2.5 ft.  It has something 
>> to
>> do with locations near certain military installations.
>>
>> Mike B
>>
>>
>> On 7/10/08 10:42 AM, "3-dB Networks" <[EMAIL PROTECTED]> wrote:
>>
>>> 2.5' Minimum on 11GHz
>>>
>>> Daniel White
>>>
>>> -----Original Message-----
>>> From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On
>>> Behalf Of Brad Belton
>>> Sent: Thursday, July 10, 2008 10:35 AM
>>> To: [EMAIL PROTECTED]; 'WISPA General List'
>>> Subject: Re: [WISPA] Dragonwave antenna pattern for RM
>>>
>>> Doesn't 11Ghz have a 4' minimum or was that changed?
>>>
>>> Last rumor I heard was you might be able to get a 3' or possibly even a
>>> 2'
>>> approved for 11GHz, but if it becomes a problem then you'll be forced to
>>> change to an antenna that doesn't cause a problem with a tighter
>>> pattern...like 4'.
>>>
>>> Best,
>>>
>>>
>>> Brad
>>>
>>>
>>>
>>> -----Original Message-----
>>> From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On
>>> Behalf Of [EMAIL PROTECTED]
>>> Sent: Thursday, July 10, 2008 11:26 AM
>>> To: WISPA General List
>>> Subject: Re: [WISPA] Dragonwave antenna pattern for RM
>>>
>>> Regs are 6' minimum high performance dish at 6 GHz unless something
>>> changed
>>> recently.
>>>
>>> At 11 Ghz you should be able to get 99.99 and use the 5 Ghz to back it 
>>> up
>>> Sent from my Verizon Wireless BlackBerry
>>>
>>> -----Original Message-----
>>> From: "Jonathan Auer" <[EMAIL PROTECTED]>
>>>
>>> Date: Thu, 10 Jul 2008 11:17:07
>>> To: WISPA General List<wireless@wispa.org>
>>> Subject: Re: [WISPA] Dragonwave antenna pattern for RM
>>>
>>>
>>> Not really. The biggest I can use are 3'
>>>
>>> On Thu, Jul 10, 2008 at 11:14 AM,  <[EMAIL PROTECTED]> wrote:
>>>> Do you have facilities to mount 6' antennas at any real height??
>>>>
>>>> You may be able to get away with 11 GHz...
>>>>
>>>> Bob
>>>> Sent from my Verizon Wireless BlackBerry
>>>>
>>>> -----Original Message-----
>>>> From: "Jonathan Auer" <[EMAIL PROTECTED]>
>>>>
>>>> Date: Thu, 10 Jul 2008 10:57:06
>>>> To: WISPA General List<wireless@wispa.org>
>>>> Subject: [WISPA] Dragonwave antenna pattern for RM
>>>>
>>>>
>>>> Does anyone have a Radio Mobile antenna pattern for the Dragonwave
>>>> Horizon Compact?
>>>> Is there a better tool/method for figuring out if the 6+Ghz licensed
>>>> freqs are appropriate for a link?
>>>>
>>>> I could be barking up the wrong tree with this... Are the higher freq
>>>> licensed links appropriate for ~15-25 mile links?
>>>> At the moment I'm using PTP600s and AN-50es to do the job but I can't
>>>> get the speed I'd like because of noise floor.
>>>>
>>>>
>>>>
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>>
>> --
>> Mike Brownson
>> Hutton Communications
>> 5015 Paris St
>> Denver, CO 80239
>> 303-373-3170
>>
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>
>
>
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