dslreports logo
site
 
    All Forums Hot Topics Gallery
spc

spacer




how-to block ads


Search Topic:
uniqs
626
share rss forum feed


WiFiguru
To infinity... and beyond
Premium
join:2005-06-21
Mt Baldy, CA
Reviews:
·DSL EXTREME

[Equipment] Advice: 900, 2400, or 5800Mhz?

Hi all!

Need an opinion on signal penetration.

I need to shoot a link for myself, its about 3000 feet ptp.

Both radios will be up high, on a roof, outside.

One side is higher than the other by about 50 feet, clear line of sight

ISSUE:
On one side, there is a partial bit of concrete roof in the way. It is about 6 inches thick. Think of it as a concrete wall (the piece of concrete sticks up a few feet from the actual roof) There is no way around it (I can't put radio high on a pole due to management rules), It must be below that concrete wall/height.

Also, this is the only path. No way to get around this concrete roof line.

From experience, what would you use if this was the only obstruction?

I am looking at Ubiquiti products here (doing this for myself, so I am on a budget)

Thanks in advanced! I am sure I will get mixed replies, I kind of want to shy away from 900Mhz -- but if I have to use it i'll place the order.

I have attached an example of what I am talking about.


Inssomniak
The Glitch
Premium
join:2005-04-06
Cayuga, ON
kudos:2

3000 feet near LOS? Thats only 1/2 mile.

Id use 2.4ghz, place the radio at the concrete wall side as far back from it as possible and as high as you are allowed.

Perhaps a nanostation at that end, and a nanobridge at the other non blocked end.
--
OptionsDSL Wireless Internet
»www.optionsdsl.ca



John Galt
Forward, March
Premium
join:2004-09-30
Happy Camp
kudos:5
reply to WiFiguru

The further you are from the parapet (the short wall you referred to) towards the center of the roof, the taller mast you can use and not have it be seen from the ground.

By gaining that height, you can shoot over the wall with room to spare.

I'd use 5.8...smaller FZ.



WiFiguru
To infinity... and beyond
Premium
join:2005-06-21
Mt Baldy, CA
Reviews:
·DSL EXTREME
reply to WiFiguru

I should've been clearer, sorry.

The wall that I need to go through is on another building across the parking lot. It is only a little bit lower elevation wise(few feet), but not enough to make it a clear path.

I can get over my roof without an issue (management rule/height wise), it is the other roof that I am worried about (to get signal through/over that one wall).



John Galt
Forward, March
Premium
join:2004-09-30
Happy Camp
kudos:5

The words "going through" and "wifi" are hardly ever used in the same sentence, especially when the word "concrete" is also used.

I'd say you need to be as far back from it as possible, if you are actually attempting to directly penetrate the concrete.

Every bit of elevation you can get on the far side is advantageous.

And move to 2.4 GHz...



WiFiguru
To infinity... and beyond
Premium
join:2005-06-21
Mt Baldy, CA
Reviews:
·DSL EXTREME

said by John Galt:

The words "going through" and "wifi" are hardly ever used in the same sentence, especially when the word "concrete" is also used.

I'd say you need to be as far back from it as possible, if you are actually attempting to directly penetrate the concrete.

Every bit of elevation you can get on the far side is advantageous.

And move to 2.4 GHz...

Well yeah, which is why I am posting here. I am hoping once I get some radios in place it will work without a hitch.

So 2.4Ghz you recommend? Just to settle my curiosity, why not 900Mhz?


Inssomniak
The Glitch
Premium
join:2005-04-06
Cayuga, ON
kudos:2

said by WiFiguru:

said by John Galt:

The words "going through" and "wifi" are hardly ever used in the same sentence, especially when the word "concrete" is also used.

I'd say you need to be as far back from it as possible, if you are actually attempting to directly penetrate the concrete.

Every bit of elevation you can get on the far side is advantageous.

And move to 2.4 GHz...

Well yeah, which is why I am posting here. I am hoping once I get some radios in place it will work without a hitch.

So 2.4Ghz you recommend? Just to settle my curiosity, why not 900Mhz?

900mhz will also likely work, but usually offers slower throughput, and more problems with noise. You never mentioned how much traffic you wanted to move?
--
OptionsDSL Wireless Internet
»www.optionsdsl.ca


WiFiguru
To infinity... and beyond
Premium
join:2005-06-21
Mt Baldy, CA

Makes sense, I was thinking noise would be an issue on 900.

Bandwidth wise, 20Mbps+ would be nice.



WiFiguru
To infinity... and beyond
Premium
join:2005-06-21
Mt Baldy, CA
Reviews:
·DSL EXTREME
reply to WiFiguru

Click for full size
Here's the ligowave map calc with 2.4, 23dbm power, 8db gain


John Galt
Forward, March
Premium
join:2004-09-30
Happy Camp
kudos:5

Using Google Earth, draw a line between the two locations. Try and see what is located at the 0.35 miles mark.



WiFiguru
To infinity... and beyond
Premium
join:2005-06-21
Mt Baldy, CA
reply to WiFiguru

There's nothing. Its laid in -- a rock quarry.



John Galt
Forward, March
Premium
join:2004-09-30
Happy Camp
kudos:5

said by WiFiguru:

There's nothing. Its laid in -- a rock quarry.

Well, on with the test, then.


WiFiguru
To infinity... and beyond
Premium
join:2005-06-21
Mt Baldy, CA
Reviews:
·DSL EXTREME

said by John Galt:

said by WiFiguru:

There's nothing. Its laid in -- a rock quarry.

Well, on with the test, then.

:p

I plan on ordering radios in a couple of days... Will let you all know how it goes when I get things set up.