… Planning on setting up a (non line of sight link) spanning 13 miles using a 13dbi V-pol 120 Sector powered by the sr9 at full power
… linking to a 15dbi also powered by a sr9 (full power)
(Each site will use Mikrotik with rb532a’s)
Transmitting height about sea level: 160ft
Receiving end above sea level: ~30ft with a 3 ft tripod (ha)
… Just wanted to know if the above sounds plausible.
Also noise is’nt an issue here…
Thanks much for any replies!!
Sounds like it will work just fine.
Is this P2MP? Otherwise a 120 deg sector is huge waste of RF. Anyway you should use a regular directional on the far side. Should be no need to blow at full power if you aim your signal properly.
appreciate the responses…
well its suppose to be a ptp link but I figured the 120deg. sector would help aiming a bit, (this is essentially a demo* setup to prove the capabilities of mikrotik and furthermore 802.11, if convinced will go ahead with 5.8 for a cleaner* and more stable link).
I can imagine it would be a pain to effectively aim two directional* antennae one with a degree beam* of 16 and the other with 30*over 12 miles (in this case approx 13) … I may be wrong but even with gps aid it would still be a pain.
My question is, will the sector work in the instance that I wanna aim the receiving antenna in the general direction of the transmitting tower and get a usable signal? (I.e take out antenna, do minimal aiming and still get signal with sector since its a wide beam) ?
any insights would be great and much appreciated. 
ok, so I opted for two 15dbi’s at each end… still dubious if it would work tho… a reaffirmation of any sort would be great! 
… Ill keep you guys posted on how it actually works.
At 13 miles I would be srprised if it would work… The area around the low end will need to be clear of obstruction for some distance… It will aslo depend on what through put you expect
Erik
hmm I c… well since 900mhz is claimed to be the “master” of freqs. Im sorta putting my faith in it… well the area is relatively clear (85%) The total eirp is 22watts… im assuming thats alot for the 900 band and should give me the range I need. As for the throughput 5mbps d/u would be great (at least)…
Regards.
Any inputs? feel free to share…!
I don’t see that working. I could see that going about 2 or 3 miles max. 900MHZ cant go very far from my experience? If if it did work, you could push maybe 1M if your lucky. Not an expert by any means, but I have worked with SR9 and they dont go that far. Plus there is a lot more 900mhz interference that you think.
hmm interesting that you say so because Ive always lived under the concept that the longer the wavelength the same applies to the range. (That is not to say I dont appreciate your response!) When calculated the theoretical rssi is said to be ~-59. And as for the noise, I pretty much live in the middle of nowhere and the tdma network in the area uses >900mhz the gsm network utilizes the 1900 mhz band. Ill get spectrum any. to certify this but im alost 100% certain.
Id like to think it can actually work … If 2.4ghz can do it … it should be a breeze for 900mhz.
Regards. The link will be put to test next week so Ill see how it goes. Im willing to bet a hand it’ll work. 
mad802 -
I’ve had good luck w/900M going the distance. Interference is always the handicap with 900Mhz. If the spectrum is clear you’ll get good performance.
Aiming antenne - Let’s see you opted for two 15dbi antenne… That’s about a 30 degree spread, and you’re going 13 miles… At 13 miles you should have a couple of miles signal spread. Should be pretty easy to hit. If you have any doubts just get a map and a compass and rough aim your AP side - the client side - just use the built in MT aiming selection. This should be close enough to get you what you need to test it out. You should easily get 5M with you setup.
Thom
For got you are a P2P, i was thinking P2MP with a 4watt limit at the AP If you figure your 85% clear I would lean a lot more toward it working… As with all NLOS your never quite sure until you try it.
Erik