Comment by Melih Karakelle on December 25, 2010 at 3:47pm

@Rana, yes this is my plan. But of course works only when IMU and GPS attached. 
I have very long way to finishing all features and firmwares. Everything could be change in this period.

Comment by Jhon on December 25, 2010 at 7:10pm

in the transmitter module there are two big white squares,
what they are for? looks like a missing component

maybe you could show how IMU and rx looks once connected both,

looking the size, i am not sure if the IMU can be mounted over the receiver or must be connected with a cable

Comment by Russkel on December 25, 2010 at 7:50pm

I am looking at another brand of UHF (433mhz) transmitter and theirs provides 600mW on the Tx. Now.. I know that there is that rather nice 7 watt booster, but how can we get, say, 600mW Tx from OpenLRS?

Comment by Russkel on December 25, 2010 at 7:55pm

http://www.horizonhobby.com/Products/Default.aspx?ProdID=JRPA615

or more speccy

 

http://www.horizonhobby.com/Products/Support.aspx?ProdID=SPM6817

 

Comment by Melih Karakelle on December 26, 2010 at 4:07am

@Jhon, the blank square for speaker ;) I'm using a speaker(not a buzzer) because of different frequency alerts etc. And you can see the pinouts for IMUnext that placed on right top side of Rx module (G,DA,CLK,3.3V) This pins supplying the stamp size 6DOF IMU and talking it with I2C protocol. I didnt design it for connect over Rx, because you should fix the IMU on CG point and it must be parallel to the earth. you need 4 wire for connection.

 

@Kamu, thanks for JR module links, i send the mail for 5 module producers and i'm waiting for replies. Module base versions less useful for DIY usages but i will think about that for plug and play RC users. HopeRF producing 500mW version of same modules but it is working with 12V and 3 times bigger than current ones.  

Actually the OpenLRS project didnt focused on "long range" because it is illegal for %90 of the countries, current 20db (100mW) output power is enough for most of applications and we are focusing on telemetry and firmwares.  You dont need Parallel PPM to Serial PPM converters / extra telemetry transmitters anymore. Just change the firmware and you got it.

I will share the codes and PCB design in few days.

Comment by Jhon on December 26, 2010 at 12:54pm

my friend, did you add some band pass filters to the receiver in order it dont get jammed by 1,2 Ghz Transmitters?
Noise and band filters looks a "must have" now a days, otherwise you will end up with customers complaining about the low range they are getting, and then you will end up returning money to some sad users or blame the problem to the RFI of  switching regulators in the setup, cheap quality ESC, and so on...

cheers

Comment by Renato Aranghelovici on December 26, 2010 at 1:02pm

I wonder how a higher frequence transmitter could jam a lower one...

Probably you have read about harmonics, but these are exacty the oposite ;) the 3rd harmonic of 433Mhz could influence 1280MHz video , and not the reverse.

It's like saying that 5.8Ghz video could infuence 2.4Ghz RC ;)

Comment by Russkel on December 26, 2010 at 7:57pm

The higher power Tx unit I mentioned before was used by trappy (EzUHF) and his videos of flights through the beautiful Alps really inspired me. That kind of long range would be fantastic which is why I asked. Anyway OpenLRS is definitely on my shopping list and I hope it is unofficially adopted as standard by DIYDrones ;). Thanks Melih & Flytron.

Comment by Jhon on December 26, 2010 at 9:37pm

eap, thnks @Renato 

@ Kamu Johansen any way, you can user high gain antenas, 
500mw = 27dBm
100mw = 20dBM

use a 7dBm antena with the OpenLRS and its like if you had 500mw output ^^

Comment by Melih Karakelle on December 27, 2010 at 4:24am

@Jhon, RF module already including 20+ component for filtering, i guess they are enough for most of case.

 

@Kamu, You cant compare it with other FPV LRS systems because other ones using one way transmission without telemetry and Trappy using  2W (on booster mode) transmitter. mean, you have 2W parasite source on the plane when using telemetry. I'm designing it for opensource receiver usages as onboard stabilization, telemetry, etc. For only "long range", you can choose the solution from other brands or use my booster.

 

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