Yesterday I got transmitter from Goodluckbuy - I have to say, it is a bad luck
Transmitter is very cheap - 14USD only. But no description in GLB and no any description in parcel.
I tried to check, what is inside - well, it is richwave RTC6701, datasheet is available, I found right pins.


Seems as transmitter is trying to work - at least I can see some noise in my goggles, but no image.

I found app notes for RTC6701 - and here something strange - R14 and R16 is very strong divider. This part of transmitter done exactly as in app notes - my feeling as mistake somewhere here.

Does somebody have experience with this chip? How video input should be done?
Schematic is here

http://www.rcgroups.com/forums/showa...8&d=1355430530

Looks like it takes an input from an I2C bus. Perhaps with a frequency counter you can figure it out?

-Alex

Originally Posted by IBCrazy

Looks like it takes an input from an I2C bus. Perhaps with a frequency counter you can figure it out?

-Alex

Here is no i2c bus - SPI only. But when pin 15 is grounded - only simple CSx pins defined frequency.
Problem is not here - the most probably frequency correct, but DCO modulation by video is not working - video signal after divider is too weak.
Datasheet is here

Now it is functional and ready to fly! My stupid mistake - transmitter have no possibility to adjust level of video signal and video should be according specification.
Power consumption is about 0.5A (5V).
P.S. I am sorry, GLB

Videolink test is here

The Cheapest FPV 2.4GHz Video Link - 1st test (11 min 30 sec)

GLB receiver - 11USD and 1W transmitter - 14USD - short test without OSD and co-pilote.