Problem with Tx and Rx avionic RCB 7X

Dr. Abhishek Agrawal · May 18, 2013, 01:53:42 PM

Hi everyone

I am using Tx and Rx of Avionic RCB 7x from RC Bazaar since 3 months
Yesterday i had problem with my Tx and Rx i.e. during flying the rudder was turned to left side and locked and not worked at all. After safe landing i checked it. After removing all connections from Rx i again connect it. After connecting again the rudder turned to left side. I am using mode II system and when i connect the rudder to other channel it works well. and i interchange the channels, all channels are working well except CHANNEL 4
What is the problem? Please suggest

santhosh-r · May 18, 2013, 02:36:43 PM

Probably...the potentiometer for the rudder stick would have been damaged...
Do you have any menu to verify the movement of the sticks?? as in Spektrum Tx ??

dineashkumar · June 03, 2013, 09:58:27 PM

Quote from: santhosh-r on May 18, 2013, 02:36:43 PM
Probably...the potentiometer for the rudder stick would have been damaged...
Do you have any menu to verify the movement of the sticks?? as in Spektrum Tx ??

santhosh - in my rcb 7x i found that servo chatters a little when building my heli but i thought its normal and left and it worked fine.
some time everything is fine and some time its happening.
how can i fix this ?
its not due to servos because its happening with new servos too.
:-(

santhosh-r · June 03, 2013, 10:07:21 PM

I think the frame rate is the cause of all these problems ...

For a seven channel Rx if each channel uses 2.5mS then 7 x 2.5mS = 17.5mS ~ within 20mS (50Hz)
but this thing uses 12.5mS frame rate = 1.785mS per channel ...but it is not enough ...so some channels may overlap the other one's signal...causing the servos to jitter..

dineashkumar · June 03, 2013, 10:09:37 PM

is it possible to fix the issue?

santhosh-r · June 03, 2013, 10:15:39 PM

I have asked RCB about how to change the frame rate...but even they don't know about it and they told me that - they have forwarded the same query to the manufacturer...hope we will get an answer soon..

dineashkumar · June 03, 2013, 10:16:27 PM

okay thank you

KALYANPRODHAN · June 04, 2013, 08:31:14 AM

Just Replace the ESC and the servo jitter will vanish! Check it.
Then use either separate ESC or just use an BEC as separate.

Just give a try and let us know.
This is because slight fall of BEC supply voltage while loading comes. Some people replace the capacitor of ESC and got recovered in few cases.

dineashkumar · June 06, 2013, 02:08:29 AM

i will try that thank you