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› Long Distance Microwave D'Link
02-12-2006 11:34 AM  11 years agoPost 1
flymotioncam

rrNovice

Port Macquarie AUS

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Hi all

I'm looking for a downlink that will do 25miles/40 kms.I have read on the net that it can be done but the transmitter is heavy and expensive and needs lots of power/amps.I've heard it being done using a 100mw TX as well but you need a 4foot dish/reciever.This is for a autonomous helicopter so it needs to be fairly lightweight and reasonable quality video transmission. Is this an impossible task....looking for ideas.

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02-12-2006 05:36 PM  11 years agoPost 2
junkpilot

rrVeteran

Alamogordo N.M.

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Microwave?

Talk to the Jet Propulsion Laboratory in Pasadena Ca.( they are a part of NASA ) They routinely talk to spacecraft half a billion miles away and you know weight is everything on a space launch!
Junkpilot

When you fly JUNK it's hard to tell when you've crashed!

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02-12-2006 06:06 PM  11 years agoPost 3
HiroboEric

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Los Angeles, CA.

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wirelessvideocameras.com

Eric Pacheco, AirWorksRC.com

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02-12-2006 10:47 PM  11 years agoPost 4
jb_turner

rrElite Veteran

USA

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100mw is not enough. You may have to contact the military to see what they use .

"wirelessvideocameras.com"

That is too funny.

JB "Do a SEARCH" Turner

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02-13-2006 12:13 AM  11 years agoPost 5
ScareCrow_Delta

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Sebastian, FL

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25miles is a long distance. VHF radios used by the miltary with 22mile range transmit at 40watts

~~~~ Defy the laws of gravity....gracefully ~~~~

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02-13-2006 04:28 AM  11 years agoPost 6
classic

rrElite Veteran

All over the place!

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Are you looking for a data or video transmitter?
Opps, never mind, just re-read your post

Which is worse, ignorance or apathy? I don't know and I don't care!

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02-15-2006 06:44 AM  11 years agoPost 7
RescueHelicopter

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Portland Oregon

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what are you using this for?

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02-18-2006 04:34 AM  11 years agoPost 8
michaelconnor

rrNovice

USA

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I know this doesn't exactly apply, but a friend of mine on team iFiber Redwire got a 125mile 11megabit 2.4GHz connection with an unamplified wireless adapter at this year's DefCon Wifi Shootout...granted, the antenna was a bit larger than usual. I'd say 25miles isn't impossible with a small air-born omni-antenna and 100mA, but you'd need the ground antenna to be larger and highly directional. Also, the required throughput is going to be a very important factor with respect to feasibility. If you're ambitious, you could have the ground antenna actuated to vector it toward the heli's reported GPS location. Unfortunately, I'm unaware of anything like this presently in the commercial sector. My best advise is to buy some different equipment configurations, and experiment until you find something that works.

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04-27-2006 05:13 AM  11 years agoPost 9
AUTOSTART

rrNovice

Indonesia

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DataLinks

Have you tried MicroHard? A canadian company.
IP920 i think the model is, has claimed 60 miles non line of sight.

GP

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08-01-2006 12:41 AM  11 years agoPost 10
Aerosight

rrNovice

Central Oregon

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Here may be what you need..

[url=http://www.gigawave.co.uk/]
GPS tracking antennas and video links used for nascar etc..

Aerosight Innovations

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08-01-2006 05:24 AM  11 years agoPost 11
RQ-1B DRIVER

rrApprentice

Whittier, CA

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Links

Not necessarily the power but also antenna gain . I know one 5 ghz link 10 watts is good for about 130 miles.

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