Generally speaking, when the FCC specifies antennas they are more interested in the pattern than the gain. Specifically, they have a beamwidth and sidelobe suppression mask that they insist upon. This is always true with satellite uplink dishes. Not totally familiar with the point to point fixed microwave requirements but I would suspect this to be the case there as well. For parabolic reflectors, gain=directivity*efficiency or directivity (beamwidth) = gain/efficiency. Most parabolics are about 50-60% efficient. So you can treat that as a constant. ----- Original Message ----- From: "Tom DeReggi" <[EMAIL PROTECTED]> To: "WISPA General List" <wireless@wispa.org> Sent: Thursday, July 10, 2008 12:29 PM Subject: Re: [WISPA] Dragonwave antenna pattern for RM
>A couple notes... > > Because this is a Dragonwave thread, I'd recommend that you contact > CharlesWu at cticonnect.com, I've been very pleased with his assistance in > the past on Licensed. > > As for 11ghz dish size... The requirements are not size, it is gain > characteristics of the dish. In most cases only a 4 ft dish demonstrated > those characteristics. > There is a 2.5ft dish on the market that DOES meet the requirements to be > equivellent of a typical 4ft dish. If you need this 2.5ft dish, it will > also effect your selection of gear, as some manufactyurers require use of > a > specific dish, based on the mounting and waveguide methods to be > compatible. > Take note that it is now legal to use smaller dishes, based on recent > lobbying and FCC decission, but it is on a secondary basis that gives > priority to the users of larger 4ft dishes. If you deploy smaller than > the > 2.5ft full spec'd dish, you should fully inform your self with exactly > what > that means, as far as rights you have under the license. > > With that said, we have been very pleased with our Trango 18Ghz Licensed > gear. They are shipping 11Ghz stuff now also, and definately worth a look, > if you have not yet made a purchasing decission. > > Tom DeReggi > RapidDSL & Wireless, Inc > IntAirNet- Fixed Wireless Broadband > > > ----- Original Message ----- > From: "Jonathan Auer" <[EMAIL PROTECTED]> > To: "WISPA General List" <wireless@wispa.org> > Sent: Thursday, July 10, 2008 11:46 AM > Subject: Re: [WISPA] Dragonwave antenna pattern for RM > > >>I did not know that. >> Can anyone suggest a good FAQ/Intro resource for someone just getting >> into licensed backhauls? Or a collection of links so I can RTFM? >> >> On Thu, Jul 10, 2008 at 11:35 AM, Brad Belton <[EMAIL PROTECTED]> wrote: >>> 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. >>>> >>>> >>>> >> >> >> -------------------------------------------------------------------------------- >> 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/
