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Permalink Reply by Ryan on May 31, 2010 at 3:03am

Keeping them far apart isn't going to do anything for you!

I mean, think about it, if you keep them 12" away and hope to that the signal will be weak enought to not interfere then how do you expect it to reach the ground where you're standing :)

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Permalink Reply by Brett Glossop on May 31, 2010 at 9:08pm

Thanks for all the replies, much appreciated.

I just found out that the Xbee rf tx would be a no go (unless modified) due to it overlapping with GSM mobile phone network.

From ACMA in Aus:
Please note: the Australian 900 MHz ISM band is strictly limited to 915 MHz – 928 MHz. Australian mobile telephone carriers operate their GSM mobile telephone networks between 890 MHz and 915 MHz so operating at or below 915 MHz will almost certainly interfere with these services. Severe criminal and civil penalties exist for interfering with licensed services.

From Xbee datasheet:
Frequency band: 902 - 928 MHz
and no C-tick (Aus certification)

Maybe someone here knows how to modify????

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ModeratorPermalink Reply by Brian on May 31, 2010 at 11:26pm

I'd look more into 1.2GHz. You'd get good distance and it's available (cheap).

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Permalink Reply by John Holdsworth on June 1, 2010 at 7:33am

if you want to go 5.8 (against the advice here) then try BEVRC (birds eye view) web site...


www.bevrc.com

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Permalink Reply by Steve Croft on July 12, 2010 at 1:25am

I've rigged up a 5.8GHz downlink for a UAV company, using Airwave TX/RX's. The TX was only 25mW, a night test resulted in 500 metres range with clear video, a small pcb 7db patch was used on the RX.

Checkout Iftron online,http://www.iftrontech.com/5.8GHz-Diversity-Pro-Receivers/c48/index.... they make a 5.8GHz diversity Pro receiver, this produces very good results.
Matching TX's range from 25mW to 500mW.

The 2.4GHz band is a bit too busy for my liking for a reliable downink. 900Mhz & 1.2GHz band are better, but, illegal in many countries.

Steve

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