HI
I need to establish a wireless link with the following specifications:
Point A :
Altitude : 1779
Tower height : 50 metr
Point B :
Altitude : 1429
Tower height : 36 metr
What radio do you recommend?
What dishes do you recommend؟
Tanks For Your Help
Mmm…
~1Mbps?
What do you mean؟
At this distance…
i need minimum 20 mbps at this distance
If you are serious about 168KM that it would be almost impossible i’d imagine. At that distance you would have to take into account the curvature of the earth, let alone signals to travel that far without loss of power.
Your better bet would be to break it up and have repeaters throughout the link. Some poeple have built very nice battery powered solar charged systems to sit atop mountains with no power.
With 34dbi antennas and RB911 it shows it will be posible…
(168Km, not 161, but why is limited to 161Km the link calculator?.. 
)
For cable must be used LMR900 or better, not the LMR400.
RB911-5Hn: 23dBm @ 6Mbps,
RB911-5HnD: 26dBm @ 6Mbps SINGLE CHAIN,
RB911G-5HPnD: 30dBm @ 6Mbps SINGLE CHAIN,
@ 24Mbps (minimum for obtain 20Mbps, as required) the power are 17dBm SINGLE CHAIN,
if you use RB with both chain active, the power decrease.
You have considered Fresnel? 1468m mountain @ 75,2Km broken “lens”…
And not forget: in some country you can not transmit over 1W EIRP…
With that power, you never reach the distance…
Do you understand anything from this?
The lowest single chain power is 23dbm not 17.
If both chains are used, power increase to double.
At 24mbps or HT20-4/HT40-4 power is 27dbm single chain and 30dbm dual chain.
Nighty night…
Are you joking me?
Read the follow line:
The lowest single chain power is 23dbm not 17
Lowest 23dbm?
If both chains are used, power increase to double.
False, increase THE SUM OF BOTH CHAIN, but not double, on RouterBoard hardware.
At 24mbps or HT20-4/HT40-4 power is 27dbm single chain and 30dbm dual chain.
When receiving the signal, each H/V part of dish antenna receive the single chain, not the sum…
27dbm+27dbm=30dbm this is double the power in wireless and another radio transmisions
Are you sure?
btw everyone knows that 3dbi is double the power…
It seems that everything you know and write is wrong. You should learn these before giving (wrong) advises to others.
These two pictures are contradicting everything you know till now.
Fascinating…
Following your teachings, I can use my CPE with single vertical polarization at more distance, if I use doube polarized panel H/V and transmitting on both channel…
…it’s not my teaching, it’s an fact.
Ok, I hope some other person confirm that:
You sustain that transmitting on both Horizontal and Vertical polarization, made possible receive strong signal with one polarization only antenna.
I knew that two electro-magnetics signal at 90° do not interact, because are perpendicular to each other,
and that Vertical polarized antenna are unuseful for receiving Horizontal polarized signal (and vice-versa).
I’m waiting for other people or documentation sustaining what you consider a fact.
I think it is not smart to transmit 2 chains in 2 polarizations against 1 chain 1 polarization antenna. As there is no ideal antenna able to 100% filter the polarization, it gets one as signal and the second as noise. Bigger noise, bigger consumption and worse effective throughput are the only results.
I would recommend you have a look on Fresnel zone - http://en.wikipedia.org/wiki/Fresnel_zone
Like said before, the best choose should be split this 168KM in at least 2 links.
Forget about this kind of calculator, it doesn’t consider obstacles or Fresnel zone obstructions.
You are the guy talking single polarity. I’m pretty sure Inox is talking about a 34dBi dual polarity dish.
This link is possible, theoretically, though I’m glad it isn’t my responsibility. Sounds like it would be fun to try, but I’d hate for my job to rely on it.