Hi, I need to make a link at 129 km. of distance, the first point is located at a plain terrain, and the other point is located on a mountain at 1600 Mts, then... i have a free fresnel area!.
I gonna maka a experiment with two 31 dbi anthennas, 2 pc with Microtick Os 2.9, 2 Senao PCI cards chipset Atheros, and two amps 1W. Configurated in nstrem mode and turbo mode
i need transmit 5 Mbps.
can i make it's works?
any recomendations?
tks... sorry my english es very bad!
IGadget, we to make a 109 Km link to 3 Mbps (TCP) with the following configuration.
Point 1:
3490 m altitude.
24 dBi grid Antennas.
2.4 Ghz Celeron CPU.
20 m LMR 600 cable.
Atheros R52 card.
Don`t Nstreme.
2.9.2 Mikrotik version.
Point 2:
2700 m altitude.
24 dBi grid Antennas.
2.4 Ghz Celeron CPU.
20 m LMR 600 cable.
Atheros R52 card.
Don`t Nstreme.
2.9.2 Mikrotik version.
With 31 dBi anntenas 139 km are possible mountain to mountain. I don´t have experience with mountain to plain land.
This is my recomendation:
1. The 31 dBi antenna is very difficult the align. First align with 24 dBi and later replace. To align antennas, to take into account the altitude difference (to align vertically also)
2. Use Lighting arrestor, ethernet and 120 VAC protector in both point. Is important, for probe and align antennas don´t have the lighting arrestor install.
3. If use RB230 or 500 outdoor, use POE protection en both ends. This is very sensitive to electric storm.
4. Use short coax antenna cable en both ends.
5. Don´t use amplifiers (Normis recomentation).
6. Patience.
Point 1:
3490 m altitude.
24 dBi grid Antennas.
2.4 Ghz Celeron CPU.
20 m LMR 600 cable.
Atheros R52 card.
Don`t Nstreme.
2.9.2 Mikrotik version.
Point 2:
2700 m altitude.
24 dBi grid Antennas.
2.4 Ghz Celeron CPU.
20 m LMR 600 cable.
Atheros R52 card.
Don`t Nstreme.
2.9.2 Mikrotik version.
With 31 dBi anntenas 139 km are possible mountain to mountain. I don´t have experience with mountain to plain land.
This is my recomendation:
1. The 31 dBi antenna is very difficult the align. First align with 24 dBi and later replace. To align antennas, to take into account the altitude difference (to align vertically also)
2. Use Lighting arrestor, ethernet and 120 VAC protector in both point. Is important, for probe and align antennas don´t have the lighting arrestor install.
3. If use RB230 or 500 outdoor, use POE protection en both ends. This is very sensitive to electric storm.
4. Use short coax antenna cable en both ends.
5. Don´t use amplifiers (Normis recomentation).
6. Patience.
With amps all you end up with is extra noise.
For a variety of complex .. quantum .. reasons, the S/N ratio goes down and you are worse off.
THE best noise free amplifiers are HIGH GAIN antennas .... and of course, these also have the advantage of amplifying both RX and TX signals equally. IE a 20 dBi gain antenna has this gain for RX and TX.
With an amp you just don't know..
If I could be bothered to look up text books I might explain intermodulaton and noise and intercept points etc but basically - amps are a baaadddd idea..
For a variety of complex .. quantum .. reasons, the S/N ratio goes down and you are worse off.
THE best noise free amplifiers are HIGH GAIN antennas .... and of course, these also have the advantage of amplifying both RX and TX signals equally. IE a 20 dBi gain antenna has this gain for RX and TX.
With an amp you just don't know..
If I could be bothered to look up text books I might explain intermodulaton and noise and intercept points etc but basically - amps are a baaadddd idea..
I think that amplifiers is a lot better nowadays, atleast what I've read. Here is a quote from one vendor.With amps all you end up with is extra noise.
For a variety of complex .. quantum .. reasons, the S/N ratio goes down and you are worse off.
All SSB Electronic Wireless LAN RF amplifiers contain ultra low noise preamplifiers with the lowest noise figures in the industry - as well as integrated bandpass filters which results in an increase in the strength and readability of the incoming data transmission. Coupled with an ultra linear RF amplifier, this bilaterial improvement of both the received and transmitted signals results in unequalled wireless network performance.
SSB Electronic's WL-2400 50 wireless LAN RF amplifier with integrated Ultra Low Noise receive preamplifier has been designed to interface with the Lucent Technologies IEEE 802.11 wireless LAN cards including their new Turbo wireless cards. In addition, the WL-2400 50 supports the Lucent Technologies implementation of receive diversity. Versions of the WL-2400 50 can be produced to interface with other data transceiver cards.
The WL-2400 50 contains an Ultra Low Noise receive preamplifier with an internal NF of less than 0.5dB. This amplifier can be configured with optional 3, 4 or 5 pole bandpass filters for operation in extremely hostile RF environments.
Nevertheless... amps both increase noise and reduce dynamic range..
And usually do not amplify both TX and RX signal.
Antennas do not increase noise but give gain to both TX and RX signal.
Your quote from literature - ok, it would say they are good as it is trying to sell you an (expensive??) unit !
I accept they are **better** than they were, but they are still not the best solution - except in very few cases..
However - I wish you good luck which ever solution you choose!
And usually do not amplify both TX and RX signal.
Antennas do not increase noise but give gain to both TX and RX signal.
Your quote from literature - ok, it would say they are good as it is trying to sell you an (expensive??) unit !
I accept they are **better** than they were, but they are still not the best solution - except in very few cases..
However - I wish you good luck which ever solution you choose!
Tks -ALL for answer
Hi, tks for answer!
We make an experience with 2 senao AP (200mw) (without mikrotik)
using a ministubler and trafmeter, we obtein this:
signal:
rx: -76 dbi
tc: 30 dbi
noise: -95 noise
max transference rate: 300 kbps
then i think we have a good relation of signal/noise, and the amps can cover the loss of the cable, conector, etc..
and the problem is the software (ack timout, etc...) and this may be resolve with mikrotik
Tks All!
P/D1: artist1 good luck, with the 146!
P/D2: Alguien habla español (el ingles me esta volviendo loco!) jejeje
We make an experience with 2 senao AP (200mw) (without mikrotik)
using a ministubler and trafmeter, we obtein this:
signal:
rx: -76 dbi
tc: 30 dbi
noise: -95 noise
max transference rate: 300 kbps
then i think we have a good relation of signal/noise, and the amps can cover the loss of the cable, conector, etc..
and the problem is the software (ack timout, etc...) and this may be resolve with mikrotik
Tks All!
P/D1: artist1 good luck, with the 146!
P/D2: Alguien habla español (el ingles me esta volviendo loco!) jejeje
Hello IGadget. I speak spanish, but the official language of this forum is the English.
You can write me in spanish to msolis@reicocr.com
You can write me in spanish to msolis@reicocr.com
Re: Tks -ALL for answer
Hi, tks for answer!
We make an experience with 2 senao AP (200mw) (without mikrotik)
using a ministubler and trafmeter, we obtein this:
signal:
rx: -76 dbi
tc: 30 dbi
noise: -95 noise
max transference rate: 300 kbps
then i think we have a good relation of signal/noise, and the amps can cover the loss of the cable, conector, etc..
and the problem is the software (ack timout, etc...) and this may be resolve with mikrotik
Tks All!
P/D1: artist1 good luck, with the 146!
P/D2: Alguien habla español (el ingles me esta volviendo loco!) jejeje
your speed is because of stupid senao that does not have dynamic Ack value and thats why you get low bandwidth. try MT and i'm sure you can get 6mb at least (with that quality)
Works!
Hello friends of the forum, finally we made the connection of test, and I work, with a very good transference and a good stability 
, this is the report:
Distance: 129 Km
Fresnel area: clean without obstructions
PC Router : 2 Celeron with Mikrotik - Nstreme 1 (demo licence)
Radios: Senao PCI atheros 100mw
Ack-Timeout: 850 us
A/G Mode
Freq:2.4
Signal: -76 Noise: -94
Meteorologic conditions:optimal
Amps: No
Bandwidth Test Result Average: 7.0 Mbps tx 7.0 Mbps rx
Fading: 9%
thanks to everybody for the collaboration, now we will put the connection operative.
, this is the report:Distance: 129 Km
Fresnel area: clean without obstructions
PC Router : 2 Celeron with Mikrotik - Nstreme 1 (demo licence)
Radios: Senao PCI atheros 100mw
Ack-Timeout: 850 us
A/G Mode
Freq:2.4
Signal: -76 Noise: -94
Meteorologic conditions:optimal
Amps: No
Bandwidth Test Result Average: 7.0 Mbps tx 7.0 Mbps rx
Fading: 9%
thanks to everybody for the collaboration, now we will put the connection operative.
Very nice.
What cards do you have 100mw or 200mw?
Are they miniPCI senao? Which model?
And what cable do you use and how long?
I'm too from Argentina
You're from Mendoza?
Write me at tkmbe@yahoo.com
Greetings
Beat
What cards do you have 100mw or 200mw?
Are they miniPCI senao? Which model?
And what cable do you use and how long?
I'm too from Argentina
You're from Mendoza?
Write me at tkmbe@yahoo.com
Greetings
Beat
http://www.eiffelweb.com.ar/wireless.htmwhere did you get a 31db 2.4ghz antenna?
so if amps are a bad idea. do i have a problem with my config
Routerboard 220 running MT 2.9.6
800mW amp
15db omni antenna
Atheros ARP5213 wireless card
and
Routerboard 220 running MT 2.9.6
800mW amp
12db NLOS omni antenna
Atheros ARP5213 wireless card
Please could someone estimate the range of this equipment for me and how it would work without the amp and which of the 4 options would work best in a radius of 5km.
terrain is that of a small town
i mean should i pull out the amp
Routerboard 220 running MT 2.9.6
800mW amp
15db omni antenna
Atheros ARP5213 wireless card
and
Routerboard 220 running MT 2.9.6
800mW amp
12db NLOS omni antenna
Atheros ARP5213 wireless card
Please could someone estimate the range of this equipment for me and how it would work without the amp and which of the 4 options would work best in a radius of 5km.
terrain is that of a small town
i mean should i pull out the amp
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