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 Subject :Lynx V2.1 - R10, R11 & C9.. 17-01-2010 12:29:45 
IanJ
Joined: 31-10-2009 16:59:00
Posts: 4
Location: Stonehaven, Scotland, UK.
 
Forum : DakarOSD/Lynx RC Plane OSD
Topic : Lynx V2.1 - R10, R11 & C9

Hi,

I had a personal message with the following query. Here it is, and the answer.

Quote:
I have a question: looking to your lince pcb scheme, I have noticed a mod near lm393, on pin 3 (R10,R11,C9), also the potentiometer value is different from original scheme. Why do you add this modification?
Thanks
Francesco


Regarding R10, R11 & C9......this is a good question, as follows:

When I first hooked up Cristobals Lince circuit with my video Rx etc I could not get anything to work. I could not get the LED to turn on thus no data. When I looked into it I found that my video signal had some DC offset that the LM393 could not reach even though the pot was turned from one end to another.
So, I changed the design by ac-coupling the video input via C9 and using R10 & R11 to bias the video signal to about 2.5vdc, therefore the potentiometer is adjusted to about 2.5vdc also. This now works great with all different makes of video Rx.
I have come across 2 other people who had to make the same modification.

Regarding the potentiometer, it's not important 5k or 10k etc. Probably just what I had in my spares box....:)

Ian.
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 Subject :5Hz or 10Hz GPS module?.. 28-12-2009 10:17:15 
IanJ
Joined: 31-10-2009 16:59:00
Posts: 4
Location: Stonehaven, Scotland, UK.
 
Forum : DakarOSD/Lynx RC Plane OSD
Topic : 5Hz or 10Hz GPS module?

Hi,

I had a personal message with the following query. Here it is, and the answer.

Quote:
Locosys provide LS20030(without battery for Sat. memory),20031(with battery for Sat. memory) with 5 firmware options:

1Hz, 9600bps, NMEA output: GGA, GLL, GSV, GSA, RMC, VTG.
5Hz, 38400bps, NMEA output: GGA, RMC, VTG.
5Hz, 57600bps, NMEA output: GGA, GLL, GSV, GSA, RMC, VTG
10Hz, 38400bps, NMEA output: GGA, RMC, VTG, GSA
10Hz, 115200bps, NMEA output: GGA, GLL, GSV, GSA, RMC, VTG.

I think your project use 5Hz, 38400bps.
I've seen others use 10Hz, 38400bps in their project.

I don't know if I can use 10Hz, 38400bps option on your Dakar PCB with DAKAR_OSD_27b.HEX. Or should I use 5Hz, 38400bps and DAKAR_OSD_20C_LS20033.HEX?

Is there a significant difference between 5Hz & 10Hz option?

Could you please advise?

Thanks and best rgds.


Hi,

I don't think Cristobal's software supports 10Hz yet. Certainly when I constructed my Lynx the 5Hz GPS module was the fastest available. I found a post on the Spanish board from Cristobal as follows:
Quote:
This gps can operate from 1 hz to 10hz configured by software. Currently is configured by the actual firmware of DakarOSD 2.7b to work with a refresh rate of 5hz , This is more than sufficient refresh rate to fly FPV and to obtain gps information in real time in our flights. Although the actual Hardware is very overcharged with all the process, i'm not discarding the possibility of study in the future another refresh rates if it is found that are interesting.


So basically, you just plug in the GPS and the software will automatically configure it to 5Hz.
Ian.
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 Subject :Welcome to the Forums!.. 27-12-2009 16:45:26 
IanJ
Joined: 31-10-2009 16:59:00
Posts: 4
Location: Stonehaven, Scotland, UK.
 
Forum : Project News
Topic : Welcome to the Forums!

Hi all,

I have created these forums so that discussion can take place regarding my various projects. Please feel free to discuss especially if you have tried to build any of them yourself.

I look forward to sharing & caring.

Ian.
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