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Old May 16, 2011, 09:20 AM
There's magic in those wings !
khaled_abobakr's Avatar
Joined Nov 2006
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How bad is 5.8Ghz Video link for FPV .. ???

Hi ..

Please correct me .. I've read somewhere that 5.8Ghz Video link is the worst thing I can do in choosing my FPV gear .. Is that really true ??

What about video clarity , range , interference .... ??

Thanks a lot for your help

Khaled
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Old May 16, 2011, 12:12 PM
Engineer for Christ
IBCrazy's Avatar
Amherst, VA
Joined Jun 2006
10,402 Posts
Not necessarily. 5.8GHz works well in high noise areas.

Advantages:
Small antennas
Light and small TX/RX sets
Many channels to choose from
Low noise floor in most areas
Legal amost worldwide

Disadvantages:
Poor multipath rejection
Signal is easily blocked by obstacles including flight battery.
Poor antenna selection

You need to choose what works for you. It's kind of a crap shoot.

-Alex
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Old May 16, 2011, 12:22 PM
Praying for better weather
Coyote64's Avatar
Joined Dec 2007
4,147 Posts
So far ive found thats untrue, so far the picture quality has been fine, range isnt a big problem. As long as you chose the right configuration its not bad at all
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Old May 16, 2011, 12:39 PM
Kiwi in Germany
whakahere's Avatar
Germany
Joined Jun 2010
2,258 Posts
well with your antennas alex I have gone from not liking 5.8ghz to being in love with it I personally think that if I had an antenna tracker and a cp helical I think I might be able to reach 10km. Now since my range is nothing close to that with the planes I have ... I am pretty happy with 5.8ghz. Not changing to anything else now.

Alex your antennas changed the way 5.8ghz works. they are fun again .. small antennas just makes it all the better.
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Old May 16, 2011, 01:41 PM
ysb
use the force..or a quadcopter
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quebec
Joined Dec 2010
247 Posts
use 5.8 also with ibcrazy cloverleaf aerial and there is no problem...
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Old May 16, 2011, 02:05 PM
Suspended Account
Denver, CO
Joined Dec 2004
260 Posts
Yeah I like my 5.8 system too and have 2 more planes planned for 5.8. IMO the biggest strength of 5.8 is the small size and lightweight. You can get 200mw for a few grams and run it for 30 mins off a 250mah single cell lipo and the antennas are tiny too.
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Old May 16, 2011, 05:36 PM
There's magic in those wings !
khaled_abobakr's Avatar
Joined Nov 2006
4,819 Posts
Wow ,,, This is so cool to know

1-How much is the size of the SPW and Clover leaf antennas for the 5.8Ghz ?
2-What is the reliable combo of 5.8Ghz VTX/VRX ??
3-Now much better is the video feed ... ??

This is by far the best I've ever seen it was on 900Mhz and with 500mw
FPV WDR600 (3 min 37 sec)

Can you please post a link to that combo ???

Thanks a lot

Khaled
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Old May 16, 2011, 05:41 PM
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A 5.8ghz clover measures 3cm wide x 1.5cm high. Real small

You can use a mixture of antennas ( always best to mix CP with CP )

Say clover on plane Skew-Planar on rx, or Clover to Clover, Clover to Bi-Quad or helical for greater range
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Old May 16, 2011, 05:54 PM
Orlin the fpv-a-holic
bigo66's Avatar
Joined Dec 2010
196 Posts
For football field flying in circles, LOS, 5.8 ghz on circular polarized antennas is awesome. Planning some higher gain tests with helical or yagi in the near future.
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Old May 16, 2011, 05:58 PM
Stockholm, Sweden
arch001's Avatar
Joined Oct 2010
186 Posts
Some people use 1.3 or 2.4 for video and then 5.8 as a repeater system for their fatsharks.

The aircraft sends video to the groundstation on 900, 1.3 or 2.4. A 5.8 transmitter then sends the video from the groundstation to the fatshark goggles (or foxtech). I think this is a really interesting solution if you want wireless diversity. It can also be used to create more distance beween a uhf system and a video receiver.

My point is that if you get the 5.8 fatsharks (or foxtechs) and you eventually need longer range you can always get a 900, 1.2 or 2,4 video system and then use the 5.8 as a repeater system.
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Old May 16, 2011, 06:49 PM
There's magic in those wings !
khaled_abobakr's Avatar
Joined Nov 2006
4,819 Posts
Thanks a lot ...

Can the 5.8Ghz with clover leaf/SPW VTX/VRX antennas be used to fly between trees ??
losing video signal ??

Thanks

Khaled
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Old May 16, 2011, 07:10 PM
Flying low is expensive.
pdiddyg40's Avatar
United States, CO, Boulder
Joined Jul 2008
2,398 Posts
Quote:
Originally Posted by khaled_abobakr View Post
Wow ,,, This is so cool to know

1-How much is the size of the SPW and Clover leaf antennas for the 5.8Ghz ?
2-What is the reliable combo of 5.8Ghz VTX/VRX ??
3-Now much better is the video feed ... ??

This is by far the best I've ever seen it was on 900Mhz and with 500mw
http://www.youtube.com/watch?v=HtzmgleYfrw
Can you please post a link to that combo ???

Thanks a lot

Khaled
not quite sure where you got that information about the video.... In that video 7 seconds in, he says that he was flying a 500mw 5.8ghz system.
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Old May 16, 2011, 07:51 PM
Praying for better weather
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The comments below, he says he`s using 900, not 5.8ghz

You can see by the size of the inverted vee being used too
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Old May 16, 2011, 09:08 PM
Flying low is expensive.
pdiddyg40's Avatar
United States, CO, Boulder
Joined Jul 2008
2,398 Posts
Quote:
Originally Posted by Coyote64 View Post
The comments below, he says he`s using 900, not 5.8ghz

You can see by the size of the inverted vee being used too
My mistake I thought that the Vee looked big for 5.8 but I thought "hey, what do I know?"

Sorry for the wrong information.
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Old May 17, 2011, 04:04 AM
There's magic in those wings !
khaled_abobakr's Avatar
Joined Nov 2006
4,819 Posts
Hi ...

No worry ... scrtsqrl ... the video owner told me that ..

Khaled
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