[TowerTalk] Interference Problem

[Cameron Crum]

As one of these WISP's myself  I can tell you that 30 miles will be a 
stretch even if you do have LOS from the top of your tower, unless they 
operating illegally or they are going to put an 8 ft dish on your tower 
which would also be illegal. Max output in the unlicensed 2.4 Ghz is 36 dBm 
point to multipoint. Even if they give you a dedicated link there is still a 
ration of antenna gain to power reduction they must follow making unlikely 
that a 30 mile link will work with any reliability if at all. I'd be more 
concerned with what they are going to put up and wheter or not it is 
operating under the part 15 rules or not.

Cameron
----- Original Message ----- 
From: "Dave NØRQ (lists)" <n0rq-lists at sbcglobal.net>
To: <dhearn at ix.netcom.com>; "Towertalk at Contesting.Com" 
<towertalk at contesting.com>
Sent: Friday, October 15, 2004 7:56 PM
Subject: Re: [TowerTalk] Interference Problem


> Until just recently, I had a wireless ISP, using 2.4GHz 802.11.
> The radio/antenna unit was mounted on the corner of my roof,
> only 10' off the ground, to get a clear view of the ISP tower.
> Overall, the system usually worked well.  However,
> when transmitting on HF, sometimes 100w would block
> my connection, but only for the duration of  the signal.
> The data transfer restarted immediate after the HF signal
> ceased, so no real harm done.  Often, though, I could
> run 100w and still have internet traffic.  I never tried to
> determine which bands, which antenna direction, or other
> factors caused the biggest problem.
>
> Running 1kw increased the likelihood of the problem.
> My tower is about 60' from the corner of the house,
> and the antennas are 50'+ above the 2.4G radio/antenna.
>
> To summarize, yes, HF sometimes affected the 2.4G signal,
> but it wasn't really a problem.
>
> -- 
> Dave NØRQ
>
>
>
> ----- Original Message ----- 
> From: "daniel hearn" <dhearn at ix.netcom.com>
> To: "Towertalk at Contesting.Com" <towertalk at contesting.com>; "Amps 
> Reflector" <amps at contesting.com>
> Sent: Friday, October 15, 2004 6:07 PM
> Subject: [TowerTalk] Interference Problem
>
>
>>I live about 30 miles from a company which supplies high speed I net 
>>service
>> by RF link. The terrain is such that some height is required for the 
>> antenna
>> used with the system. They typically use either a slot type or a 
>> parabolic
>> reflector. A test is planned next Tuesday to see if satisfactory 
>> operation
>> can be achieved at my location by mounting their antenna on one of my
>> towers. My tallest tower is a 131 ft. motor driven UST crankup. The tower
>> has a 6 el. 20m yagi on it.I am concerned about possible problems from
>> having the ISP antenna in the RF field of the 20m beam. I also have other
>> yagis for other ham bands from 40 thru 10m on towers which are some 100 
>> ft
>> away from the big tower. I am concerned about system performance as well 
>> as
>> the possibility of smoking the ISP electronics.
>>  Has anyone had success using a rf linked ISP system with the antenna
>> mounted near a KW driven yagi? How near? If not, what would members of 
>> the
>> reflector think might happen in this case? What might be a reasonable 
>> number
>> for closest spacing. I am guessing that a usable signal might be found 
>> with
>> the antenna 20-30 feet below the 20m yagi.
>>  All input appreciated, 73, Dan, N5AR
>>
>>
>> _______________________________________________
>>
>> See: http://www.mscomputer.com  for "Self Supporting Towers", "Wireless 
>> Weather Stations", and lot's more.  Call Toll Free, 1-800-333-9041 with 
>> any questions and ask for Sherman, W2FLA.
>>
>> _______________________________________________
>> TowerTalk mailing list
>> TowerTalk at contesting.com
>> http://lists.contesting.com/mailman/listinfo/towertalk
>
> _______________________________________________
>
> See: http://www.mscomputer.com  for "Self Supporting Towers", "Wireless 
> Weather Stations", and lot's more.  Call Toll Free, 1-800-333-9041 with 
> any questions and ask for Sherman, W2FLA.
>
> _______________________________________________
> TowerTalk mailing list
> TowerTalk at contesting.com
> http://lists.contesting.com/mailman/listinfo/towertalk