Dec 27, 2020, 01:40 PM
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Slope Devil | |
Slope Devil Registered User | Hi everyone, A few days ago I received a G-RX8 V1 that could not be flashed ... The S-Port and channel 2 are dead ImagesView all Images in thread
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Dec 27, 2020, 02:12 PM
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JMP_blackfoot | |
JMP_blackfoot Registered User | Starting here: It looks like it might be the SN74AUP2G240 in the RSE (UQFN) package ? |
Dec 27, 2020, 09:14 PM
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GliderJim | |
GliderJim Going in circles. | Quote: Originally Posted by Gliderfly I am using the G-RX8 in a glider and have been getting nuisance telemetry lost and recovered alarms. The telemetry drops out but comes back almost instantly. I have the antennas lying parallel to each other in the fuse. Not close to any wiring. The fuse is mostly fiberglass with some carbon fiber reinforcement. My question is would the telemetry reception improve with the antennas outside? I hate to put holes in the fuse for negligible improvement. Gliderfly I had a G-RX8 where I didn't realize one of the antennas had become partially disconnected from the circuit board. The result was 2 or 3 telemetry lost/telemetry recovered warnings which I unfortunately shrugged off. During the next launch I lost control and destroyed my sailplane. I had been flying FrSky for about 4 years and this was the first time I had EVER gotten a telemetry lost/telemetry recovered message while in flight, but since I had heard the message while watching some guys race quads before I assumed it was something that just happens sometimes. I don't think you should ever get that message. An occasional RSSI signal strength warning maybe. Antennas at 90 degrees to each other is good advice, and if you've got a carbon fiber fuselage, get the ends on the outside. All of my antennas are inside on my balsa and fiberglass fuselages with no problems. |
| | Last edited by GliderJim; Dec 27, 2020 at 11:13 PM.Reason: added detail |
Dec 28, 2020, 04:14 AM
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mpjf01 | |
mpjf01 Registered User | Quote: Originally Posted by GliderJim I had been flying FrSky for about 4 years and this was the first time I had EVER gotten a telemetry lost/telemetry recovered message while in flight, but since I had heard the message while watching some guys race quads before I assumed it was something that just happens sometimes. I don't think you should ever get that message. An occasional RSSI signal strength warning maybe. I agree, these warnings often indicate a serious issue that need to be fixed straight away. There have been some causes that we have seen that are not fatal for control such as the faulty component in some G-RX8 receivers and warnings coming from attempting to operate both internal and external 2.4gHz RF modules simultaneously. As you found though it is unwise just to assume that the cause is one of those benign ones. |
Dec 28, 2020, 06:16 AM
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Gliderfly | |
Gliderfly Registered User | Ive trashed the G-RX8 that I got used with a Taranis radio. The telemetry stopped working altogether. I have one of the new Archer GR8s on the way. Gliderfly |
Dec 28, 2020, 08:14 AM
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Slope Devil | |
Slope Devil Registered User | Quote: Originally Posted by JMP_blackfoot Starting here: It looks like it might be the SN74AUP2G240 in the RSE (UQFN) package ? This is exactly it. But there is still one small problem ... |
Dec 28, 2020, 09:35 AM
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ridgerunr | |
ridgerunr Regexistentialist | Quote: Originally Posted by Gliderfly I am using the G-RX8 in a glider and have been getting nuisance telemetry lost and recovered alarms. The telemetry drops out but comes back almost instantly. ... I was getting the exact same behavior with my X9Lite controlling a motor glider equipped with a G-RX8 - both were on ACCST RF FCC version 2.1.0. I was also occasionally experiencing a loss of control and getting a RSSI signal loss messages during these brief encounters. This unwelcome and disconcerting behavior was happening several times per flight. This was happening at close range (less than 100 m) and both antennae were hanging outside the fuse. I further tested this indoors with telemetry logging leaving both the Tx and Rx turned on for a couple hours with the Tx and Rx about 10 feet apart - the same behavior was happening. The log data revealed that I was getting failsafes at the same times I was hearing the telemetry and signal lost warning messages. Note that all these event were short lived - less than a second. This is indeed a serious issue! The good News: |
Dec 28, 2020, 12:00 PM
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landru | |
landru Registered User | This topic is being discussed in another thread but it's probably worth posting the same alert in both places so nobody else gets caught out: The potentially severe problems in the 2.1.0 firmware for the G-RX8 were discovered shortly after it was released in April of this year. For example, on May 1, in a flight of about 53 minutes to a maximum distance of about 400m, I logged 29 failsafes. That FrSky continued to offer 2.1.0 for the G-RX8 for download after the problem was discovered and fixed is questionable in my view. The above also applies to 2.1.0 for the G-RX6 and the RX6R. |
Dec 28, 2020, 12:14 PM
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JMP_blackfoot | |
JMP_blackfoot Registered User | Quote: Originally Posted by Slope Devil This is exactly it. But there is still one small problem ... Since it is a Texas Instrument part, maybe you could try to request a sample? |
Dec 28, 2020, 02:25 PM
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Gliderfly | |
Gliderfly Registered User | In my case it is just a bad unit. I was already using the latest firmware. Gliderfly |
Dec 28, 2020, 05:57 PM
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mpjf01 | |
mpjf01 Registered User | IIRC you reported that it was one of the units made with a faulty component. This is a known issue and if you send the receiver back to your dealer or to FRSKY it will be replaced at no cost to you aside from the postage. |
Jan 02, 2021, 02:02 PM
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webbsolution | |
webbsolution Win=span\massXpractice+lu ck | https://webbsolution.ca/shop?olsPage=products As I organize my shop I found additional inventory - so I am marking it down - if you are a previous customer and want to order more and you supported this product in its initial release - please identify yourself in a PM with your order # - I have a special bonus for you. |
May 15, 2021, 03:46 PM
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gquiring | |
gquiring Sailplane Mafia | I need a replacement antenna for the G-RX8. What fits it and where can I get it (USA)? Will any of these work? |
May 16, 2021, 09:58 AM
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landru | |
landru Registered User | The ones from Amazon will fit but the ones from GetFPV will not. The G-RX8 uses the smaller IPEX4 connector, which is also known as MHF4. The larger connector, IPEX1, is also known as U.Fl or occasionally simply as IPEX. There's a picture that compares the two in the Amazon item. |
Aug 15, 2021, 12:19 PM
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seng30904 | |
seng30904 Registered User | I have a few of these GRX8's. Im setting up new sailplane, and need all 8 channels. I have tried numerous times to get the receiver to bind in 8 channel (PWM) mode, but keep getting the blue led on, indicating its in Sbus mode on channel 7 & 8. From what I undertstand, plugging a battery into the receiver while holding the bind button down, with no jumpers attached to the signal pins of channel 1 & 2 should get me to PWM mode on all 8 channels. Only while binding with a jumper on the signal pins of channel 1 & 2 will place the rx into Sbus mode on channel 7 &8. |
