900Mhz PTP bridge

[Alan87i]

I have a good friend who would like to send video from a Cattle barn back to his home.
No High speed available.
The terrain is on a gradual up hill slope but NO line of sight between the two buildings. Just tree tops . Those FRS radios work great at ground level and both buildings are high enough that antennas could be mounted 40 feet up or better. The distance would be about 1.5 miles or less .

What 900 Mhz equipment would any readers recommend to make a bridge link for this kind of setup. He would want 2 maybe 3 cameras (IP cams) in the barn and log into them from the pc at his house. Camera recommendations also welcome.

And if possible in the future we might try to set up another link from the barn ( closer to town) to another house in town for internet access. from town to the barn then to the house along with camera feeds in the late winter and spring.
Thanks
Allan
VA2CBE

[golfnut]

You may be able to establish a link but under ideal conditions, I think the best data rate at that frequency is 1.5 Mbps. Could be wrong but you might want to check that first.

A decent IP camera can stream at close to 1 Mbps depending on frame rate, video compression, etc. Some newer cameras can stream at MPEG-4 which uses almost half the bandwidth.

Axis camera's have a nice little feature that shows bandwidth consumed as you're viewing the video.

Greg

[Alan87i]

I was just looking at Tranzeo's tr-902 (http://www.tranzeo.com/products/radios/TR-902-Series) series radios. The speck pdf claims 54mbps half duplex. I can only imagine the price. So with a decent link if possible I would hope to get 10 or better actual throughput. I like the specks on the axis cameras.

The cable company and the local MRC advertised a plan to setup rural wifi in this area ,, but nothing has been done in over 2 years . I just happen to know the President of the Cable company and he didn't make any promises or sound like it would happen anytime soon. We had planned to have this service installed at both locations more for the cameras than the internet.

Allan
VA2CBE

[M/Q]

I have only used Trango equipment and it seems OK. Most 900MHz equipment is business-class so it will be more a personal choice than anything.

I would like to suggest that you do a site survey as many local .govs use 900MHz for their communications and even in rural settings could be an interference factor.

[golfnut]

That spec sheet is a bit deceiving. It says 900 MHz and 802.11 b/g so it's an assumption that this is a dual radio device.

The throughput mentioned is only when operating at 802.11g and the actual throughput is 20 Mbps (see the bottom of the second page of the spec sheet).

I'm pretty sure it's much less at 900 Mhz.

Greg

[schj98]

The Tranzeo TR-902 is a single radio device.

It will deliver between 15-20mbps half duplex throughput.

They refer to 802.11b/g only as a reference to what standard the radios modulation scheme was based on.

I have several of these links and they work well through several miles of trees.

Hope this helps.

[golfnut]

Thanks for the clarification...

Greg

[Alan87i]

Can I ask what antenna's you are using for the links with the 902's ?
Allan
VA2CBE

[schj98]

I’ve used a bunch of different types here are my favorites.

I have tried some Hyperlinktech 14dBi yagi antennas for shorter links.
http://www.hyperlinktech.com/web/hg914y.php

And Hyperlinktech 18dBi Parabolic Grid dish antennas for longer links.
http://www.hyperlinktech.com/web/hg918g.php