for a while I have been using FRSKY, it usually works great and the price is unbeaten. Unfortunately I stumbled across 2 !!!!VERY!!!! important things that I would like to share with you to make the system more reliable.
I had to learn it the hard way: My holiday FPV plane lost in the Phillippino jungle - no way to recover it - due unexpected fail safe maybe ~400m away with the FRSKY patch antenna. Impossible? Well I figured out what happened and I would strongly encourage other users to take the necessary follow up to avoid this problem. It will take 30min and save you a lot of trouble.
Besides I wrote to FRSKY support, i.e. explaining the problem. Let's test their customer support.
I will keep you posted.
Here is the email:
I recently purchased the set FRSKY set with a D8R-II RX and DFT TX module. Also, I purchased the FLD-02, Sensor Hub and battery voltage sensors, GPS – a lot of things from you guys. However I had quite a few issues which led to the loss of my most appreciated FPV aircraft: I was flying a few 100m away in an rf low noise area. All of a sudden the tx started to beep indicating a signal loss, RSSI close to 0 and went into failsafe. I had no chance to recover the plane as it crashed in the jungle. On board were video cameras, video transmitter and a few other gadgets. I couldn’t believe what happened and checked the TX module. As the picture shows, the ground got disconnected/got broken. This is clearly a very weak spot in the tx side and probably after swapping the module a couple of times, other users will run into the same issue. It took me some fiddling but I managed to properly reinforce the weak spot to ensure a lasting and proper connection. I would strongly encourage you to improve the design of this connection. I have my patch antenna mounted away from the DFT module, connected through a proper coax extension. Without the ground, the antenna length match was off – completely – resulting in the range loss. Doing a ground check may not even have solved this simply because it’s an on off problem: sometimes there will be contact sometimes no, simply because the gap is no more than 1mm.
Prior to this, I already had some issues regarding this connector as shown in the picture. It came loose and had to be manually resoldered. Gladly I noticed this before flying. Clearly this spot again shows poor manufacturing in terms of soldering spots.
I would appreciate you evaluating on the discussed issues and what you are going to do in future to avoid these kind of problems. I like the FRSKY products very much and I would like to continue to use them. Regarding the loss of my plane which cannot be recovered, maybe you could find a way to make this up to me again.
Hoping to hear from you soon.
So in one of the pics, you see that the antenna ground between coax and rp-sma is prone to break easily. I also read up and heard that other users encountered a short between the ground and the signal wire due to overheating the sig-wire when soldering: from the manufacturing side.
I mount my antenna away from the DFT, so I need a short coax extension. If the ground plane is missing like it was in my case, I wonder how it even made it that far away. It's an ON/OFF problem not so easy to detect, so please check on yours to make sure.
Other than that, the 4-pin connector that connects the HF module came loose after inserting the module maybe 2 times. Please re-solder this connector and secure the plastic cover (the black one) with either CA or hotglue.
After all, I still like this system, but try to double-check on the items dicussed.
I hope it helps,