by BobAZ » Tue Aug 17, 2010 11:44 pm
I recently sent a PM to Chase Wu at FrSky because I purchased another 8 channel receiver and got a couple of hits. This time I had set failsafe, which I had forgot to when my Trojan flew away. Below is the response I received from them.
Originally Posted by Chase Wu
Hello BobAZ,
Thank you for your PM, and I replied you via posted of #1165 (http://www.rcgroups.com/forums/showthread.php?t=1176328&highlight=frsky+2+4ghz+radio+system&page=78).
Please kindly find attached drawing on that post for your reference (sorry can not insert that in PM ). It is suggested to find the OC gate first; if failed, add one triode or 1K capactor.
PPM peak voltage would be 3.3V.
My response:
Was the lack of this circuitry the problem that I was having with the loss of signal?
Hello BobAZ,
1) S5850 or 2N5551 both can be used here as triode.
This is the reason that have caused your loss of signal.
2) HiModel will have JR modules in stock this afternoon.
3) I presume new V8HT with this new circuitry installed would be ready in about half a month.
Many thanks and best regards!
Eva
My response:
Thanks for the quick response.
You still have not responded to the following questions.
You did not indicate if I am interpreting the diagram correctly. Do I add the triode to the PPM wire from my JR TX? If so, then I understand the rest of the circuitry (resistor going to DIY PPM wire and another in parallel between there and the + wire). Am I correct?
I'm guessing that that means the JR Module and the DIY RF are different. Is that correct?
Does the following statement in your response mean that FrSky was the cause of me losing my model?
"Hello BobAZ,
1) S5850 or 2N5551 both can be used here as triode.
This is the reason that have caused your loss of signal."
It sounds like it was.
And now because I have brought this issue up you are correcting the problem.
I have not heard back from them – my last PM was yesterday, prior to that post they were very quick to respond.
I am now convinced that I have a problem with the DIY RF in my JR XP7202. Should I use the circuitry as Chase recommends in post #1165, the one recommended in post #1201, or something else? I don't have an oscilloscope, but if I can borrow one, what do I connect to get the PPM reading to see what the voltage is? Do I "tap" in by connecting to the PPM wire and ground from my TX? Do I need to disconnect the wires going to the DIY RF or is it OK to just connect to them without unsoldering?
It sounds like FrSky is making some changes to their modules and DIY RF because of problems. I don't want to try again until I know that this problem has been fixed.
Should I purchase a JR module and then remove the RF and put it inside my XP7202 (it has not module). I am not interested in the telemetry systems. I just want a system that works. I thought by going to the FrSky it was an improvement over my hack using the DM9 module which gave me DSM2. I had NO problem with it using an AR7000 receiver.