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Motorola canopy 900-926 and stl at 955.00

M

menotti1

Guest
tower i'm looking at is using for stl is using the motorola canopy system at 200 ft and 400 ft.wondering if using just barely 2 watts of stl at 955 around 40 feet on the tower would effect their canopy system, which operates in the 900-926 band...thanks for any input
 
Well, with you being the "new guy" on the tower, it would be your responsibility to insure no interference to existing users. For starters, I'd put a single quarter wave bandpass cavity with a wide enough passband for your signal (500khz "nose" in the pass, if you will) I've special ordered them from Telewave/wacom/celwave, etc in the pass. Call and talk to an engineer at these places.

*then*, investigate what it would take (in advance) to notch your signal out of the canopy system. Possibly just notch cavities in thier feed line. The motorola system I saw at one of my sites actually feed ethernet up the tower with the tranceivers and antennas all in one package up there. That may be difficult to deal with. But, if you are only running a few watts, the motorola system should be able to handle that, no sweat. Just be prepared in case it does not.
Also, don't forget to bump your STLs output enough to cover the loss in the pass filter, in case you end up using one. It's the good neighbor policy to head interference off before it happens..

Good luck!
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menotti1 said:
tower i'm looking at is using for stl is using the motorola canopy system at 200 ft and 400 ft.wondering if using just barely 2 watts of stl at 955 around 40 feet on the tower would effect their canopy system, which operates in the 900-926 band...thanks for any input
Click to expand...
Probably not...your main signal will be pointed at the other site..NOT at their equipment...and with the FHSS, Canopy wont be bothered by a single carrier 30+ MHz away.....even if you were pointing right at their antennas ;)
I would make sure you have NO noise or spurs....but with the vertical sep and using good feedline (Heliax), there should not be any issues.
 
menotti1 said:
tower i'm looking at is using for stl is using the motorola canopy system at 200 ft and 400 ft.wondering if using just barely 2 watts of stl at 955 around 40 feet on the tower would effect their canopy system, which operates in the 900-926 band...thanks for any input
Click to expand...

No problem, it works fine. The 928 MHz paging transmitters would bother it long before you world...
 
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