Hi everyone,
I’m having trouble binding my YRRC 433 MHz SiK telemetry radios (as shown in the pictures). No matter what I try, the air and ground modules don’t match successfully.
Here’s what I’ve done so far:
Configured both the air and ground modules (air module connected via FTDI USB cable) using Mission Planner and CoolTerm, making sure all parameters such as Net ID, frequency, and air speed matched on both sides — following the steps from this guide:
Upgraded both telemetry modules from SiK 1.9 on HM-TRP to RFD SiK 2.0 on HM_TRP, then adjusted parameters again as before. When that didn’t work, I reverted back to SiK 1.9 on HM-TRP firmware.
Here are the results of the default ATI commands for 2.0 (for both modules) before reverting back to 1.9:
Current behavior:
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The air module blinks red and green, while the ground module only blinks green.
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I tried both Pixhawk 2.4.8-PC and PC-PC, still no solid green light.
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They never recognize each other (no solid green light).
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According to the
ATI7command, the ground module shows high noise levels.
According to the ArduPilot documentation:
“Perhaps the most common source of noise with the 3DR-433 is noise from the USB bus on your ground station. That shows up as high values for the RADIO.noise value. If you get this, then you could try using a different USB cable, or a different laptop. You can also try using a USB hub between your laptop and your radio.”
(Reference: https://ardupilot.org/copter/docs/common-3dr-radio-advanced-configuration-and-technical-information.html#upgrading-radio-firmware)
I tried connecting the ground module to my PC through a 1-meter USB extension cable, but the noise readings in CoolTerm remained the same.
The air module keeps transmitting data — the red LED keeps blinking, and the ATI7 command confirms this. So I assumed the ground module wasn’t receiving any data. I even tried using a different 433 MHz telemetry antenna, but the result was the same, so I’m considering other options.
I also have a larger 915 MHz antenna that fits the ground module the one mentioned here:
https://robu.in/product/3dr-singlr-ttl-radio-telemetry-433mhz-250mw-for-pixhawk-and-apm/
but I’ve read that using it could be dangerous, and I don’t think it would solve the problem either. What do you think?
At this point, what else can I try to get these two radios to connect successfully? Any suggestions would be greatly appreciated.
Here is my pieces:
Here is the ATI Commands Results (CoolTerm) and Mission Planner Views for Both Modules
Ground Module
Mission Planers (I think MP always shows the wrong frequency range.)
Air Module
