Re: [Paparazzi-devel] digital video link anyone?

[Eduardo lavratti]

I searching for a good digital video link for years.
I found this kit one year ago.

Anyone know ?

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From: address@hidden
To: address@hidden
Date: Sun, 12 May 2013 19:44:01 +0200
Subject: Re: [Paparazzi-devel] digital video link anyone?

 

I have no direct experience, it´s was i have heard sometime, but i have no change to verify it.

Search for COFDEM video transmitter, the cost is 70$ from China for TX and RX having 700mW. Adding 5W/10W/25W Amplifier and it should work.

I don´t know what type of Amplifier, impulse or linear, probably linear, maybe just try. Eventually adding saw filter and preamplifier on the

receiving side helps too, just my 2cents.

 

For Closed Captioning, tell me the Video format used and imput source , and i send you one OVL/CC encoder and a decoder if you want,

lead time 2weeks.

 

Gesendet: Sonntag, 12. Mai 2013 um 18:14 Uhr

Von: Chris <address@hidden>
An: address@hidden
Betreff: Re: [Paparazzi-devel] digital video link anyone?

You are correct about antennas and power but conditions have to be ideal
each time which is not the case in my situation.
Even LOS operation is not certain as the usual range might exceed 200km.
I can adjust the output power to 5w or 25w depending on what i need but
i haven't flown so far yet
as everything need to be perfect for the first long flight.
During my middle range testing i found that one day i have perfect video
with 1w from 30km away and the next day i loose video after 17km all
other parameters staying the same.

>>You could embedded data inside the analog video too, named closed
caption encoder/decoder.
Hi and thank you very much for your reply.
You are right and i probably make something up but i was hoping to find
something ready made.
Well one of my adavantages is that i don't need a licence for anything
and i can also issue a NOTAM
whenever i need to ( i can't explain it further...) and my biggest
problem is funding because the situation here is getting worse all the time.
To tell you the truth i barely have the desire to try anymore...
All i do is experimenting to gain knowledge, i don't produce anything
for any use.
Somehow i couldn't find your message in the mail i got but i found it here:
http://lists.nongnu.org/archive/html/paparazzi-devel/2013-05/msg00045.html
Chris


On 05/12/2013 05:46 PM, address@hidden wrote:
> TBS did 80km (in the mountains!) with a 24dB grid antenna on the ground and 600mW video tx.
> There's a guy from Spain who worked on a perfect video link using circular polarization antennas. He mounted a dish antenna
> with helical and got 100km with 7 degree angle. As he also used attenuators, his theoretical range was 300km using 1W amps on the tx.


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