Re: [Paparazzi-devel] nav.h missing? SOLVED

[David Conger]

Hey Chris,
Maybe my ignorance shining through but what about multi-frequency
antennas? Here's one someone once suggested to me:
http://www.digikey.com/product-detail/en/FXP14.07.0100A/931-1056-ND/2332683
I wish someone Paparazzi would try one of these out and report their
experience. Soon I will have some time to try the ones out I have.
DigiKey has one with u.fl connector that connects right to the XBee
(with u.fl).
-David

On Fri, May 30, 2014 at 2:06 PM, Chris <address@hidden> wrote:
> Well it is too expensive as you said so i am looking also for a cheap
> solution.
> I expect to fly at least 100km away with a 10dbd yagi on the airplane
> something i have done
> but with a fuel cooled 10w analogue video transmitter (believe it or not)
> something i don't now think as a good idea :-D
> A 5w video tx coupled with 2 steerable yagis on the wing tips is more than
> enough because of power consumption and interference on other systems.
> I have used nearly all bands but the best band for airborne video seems to
> be the 2.3-2.4 ghz band
> Experimenting is necessary to find new things.
> Chris
>
>
> On 05/30/2014 11:28 PM, Eduardo lavratti wrote:
>
> wow ... 4w is much power.
> Please, when you have idea on how much long you can fly using this solution
> ... tell me.
>
> Today i can fly more than 4km using 600mw 5.8ghz fatshark clone transmitter
> with good video signal.
>
> i like this digital video system but its too expansive.
> http://www.nghobbies.com/cart/index.php?main_page=index&cPath=1_147
>
> ________________________________
> Date: Fri, 30 May 2014 22:29:08 +0300
> From: address@hidden
> To: address@hidden
> Subject: Re: [Paparazzi-devel] nav.h missing? SOLVED
>
> So far it looks that the receiver has the same or better sensitivity with
> it's analog counterpart.
> The real testing will be done in a few weeks over the sea.
> In ground testing with and without obstacles  i lost video at about the same
> or slightly more distance than the analog tx of comparable power which is
> very promising.
> Fhss also works well as seen on a spectrum analyser, the moving scene video
> quality is very nice and latency is small enough at ~150-200 ms.
> I wouldn't fly fpv with it but ~200 ms are not bad for watching around.
> I have also noticed some dropped frames but i need to do some more testing.
> The strong point of this system is that you can use a common power
> bidirectional wifi amplifier
> to increase range (i now use 4w of rf power measured) and interference on
> the airplane is far less
> than the analog video tx.
> I successfully used an 2.4 ghz rc receiver along with this 2.4 ghz video
> transmitter (at +18dbm) with no ill effects on rc range.
> Chris
>
>
> On 05/30/2014 10:10 PM, Eduardo lavratti wrote:
>
> Hi Chris, how many meter  you can get with this video solution ?
>
>
> ________________________________
> Date: Fri, 30 May 2014 21:09:25 +0300
> From: address@hidden
> To: address@hidden
> Subject: Re: [Paparazzi-devel] nav.h missing? SOLVED
>
> Hi.
> I found a cheap 2.4 ghz frequency hopping video to mpeg4 converter with very
> nice quality and sensitivity that i coupled with a bidirectional 2.4 ghz
> amplifier and the airborne tracking antenna.
> Initial test showed very good results.
> http://www.alibaba.com/product-detail/2-4G-60MW-Single-track-digital_784242131.html
> http://www.alibaba.com/product-detail/Digital-wireless-AV-sender-modules_858209681.html
> http://www.alibaba.com/countrysearch/CN/vr850sf-supplier.html
> http://www.alibaba.com/product-detail/2-4ghz-Digital-Wireless-Car-Camera_1427511862.html
> Beware that although the item is real i can't say the same for the
> transaction.
> Aliexpress is the only source for it right now i think.
> http://www.aliexpress.com/item/Free-shipping-2-4G-wireless-audio-digital-transmitter-and-receiver/1194761842.html
>
> The telemetry is done with the usual 9xtend modems and now i am about to
> test this
> http://store.rfdesign.com.au/rfd-900-radio-modem/
> Chris
>
>
>
> On 05/30/2014 01:41 AM, alonso acuña wrote:
>
> Hi Chris. Can you give me some pointers on how to implement digital video
> and secure telemetry?
>
>
> On Wed, May 28, 2014 at 10:07 AM, Chris <address@hidden> wrote:
>
> He he he  your guess is correct.
> The code i am flying is heavily altered towards a fixed wing platform.
> For example i am working on a safety algorithm that guides the airplane back
> home when gps is lost. When gps is lost (interference etc.) the airborne
> directional antenna(s) are used for guiding the airplane back home with the
> aid of the compass, the barometer and any available RSSI indication.
> Of course telemetry and video are now digital and encoded.
> Chris
>
>
>
> On 05/28/2014 06:55 PM, Felix Ruess wrote:
>
> Hi Chris,
>
> yes, I moved it to firmwares/fixedwing, as it is fixedwing specific stuff...
> But I still wonder why you got this error, I changed it accordingly in all
> sources... Did I miss something or was that in some of your own code?
>
> Cheers, Felix
>
>
> On Sat, May 24, 2014 at 8:29 PM, Chris <address@hidden> wrote:
>
> I found it, nav.h moved to "firmwares/fixedwing/nav.h" (for fixedwings of
> course)
> Chris
>
>
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