A 44 dB antenna (yes, they make them).  Some radios can be set to negative 
dB, so if a radio could be set as far as -14 and was certified with it...


-----
Mike Hammett
Intelligent Computing Solutions
http://www.ics-il.com



--------------------------------------------------
From: "Jerry Richardson" <jrichard...@aircloud.com>
Sent: Saturday, October 31, 2009 1:52 PM
To: "WISPA General List" <wireless@wispa.org>
Subject: Re: [WISPA] Backhaul Questions

> 40 miles @ 5.4?
>
> How is that possible with a 30dB EIRP max limit? Sure you could use a 36dB 
> dish but I can't see how you can turn the power down enough to stay in 
> compliance.
>
> Jerry
>
> -----Original Message-----
> From: wireless-boun...@wispa.org [mailto:wireless-boun...@wispa.org] On 
> Behalf Of Mike Hammett
> Sent: Saturday, October 31, 2009 11:45 AM
> To: WISPA General List
> Subject: Re: [WISPA] Backhaul Questions
>
> Well, depending on what the radio was certified with, you could
> theoretically go 40 miles in 5.4 GHz.  I'm not sure I'd put those antennas
> on a Rohn 25, though.  :-p
>
> MT 20 MHz can go 35 megs or so, depending on board HP and RF conditions.
>
>
> -----
> Mike Hammett
> Intelligent Computing Solutions
> http://www.ics-il.com
>
>
>
> --------------------------------------------------
> From: "Eric Rogers" <ecrog...@precisionds.com>
> Sent: Saturday, October 31, 2009 8:30 AM
> To: "WISPA General List" <wireless@wispa.org>
> Subject: [WISPA] Backhaul Questions
>
>> Ok guys...Looking for both Mikrotik experience and others.  We currently
>> have a Mikrotik backhaul between each of our towers using NStreme and we
>> have been extremely happy with the performance.  We recently upgraded a
>> tower because we were hitting 15M or so during peak times and was afraid
>> it couldn't handle much more.  We upgraded that backhaul to a Motorola
>> PTP for future capacity.
>>
>>
>>
>> The questions:
>>
>>
>>
>> MT Gurus:
>>
>> Each backhaul ranges in distance, each ranges from 3 miles (3 backhauls)
>> and the rest are about 12 miles (5 backhauls).  Since we have been using
>> Mikrotik, I have reliably seen up to 10 Meg, and I am afraid 15 Meg is
>> pushing the envelope on a 20 MHz channel.
>>
>>
>>
>> How much capacity can I reliably push on a 20 MHz channel using NStreme?
>>
>>
>>
>> Other Gurus:
>>
>> I understand the following are loaded questions, but budget is around
>> $1000-3000 range and the capacity needs to be around the 60Meg mark (30
>> each way or without a defined 1:1 guarantee, capability to flex and be
>> able to push 30M each way).
>>
>>
>>
>> If I start upgrading to larger backhauls on busy links, what type of
>> equipment should I look at?
>>
>> What can support VoIP?
>>
>> Anything that GPS times for frequency reuse?
>>
>> Anything work in the 5.4GHz range at a 12 mile distance?
>>
>>
>>
>> Eric Rogers
>>
>> Precision Data Solutions, LLC
>>
>> (317) 831-3000 x200
>>
>>
>>
>>
>>
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