Hi Shivam.
Sorry for not responding to your question earlier.
(Firstly, I am not an RFD900 expert and I do not work and RFDesign or Sparkfun, my solution might not be the best or it might not work)
Tell me if I understood correctly, only your master node is getting solid green LED, and the other radios are blinking the red LED but not solid green LED. Is that correct?
If so, I would like to know how frequent is the red LED blinking? Is it continuously blinking or it just turns on sometimes? Does it blinks ONLY when the green LED remains on for a short amount of time? How strong is the light?
I’m asking you this because I dealt with the same situation when the pattern of the red LED would actually mean it was receiving some data but not actually connected to anything. Weird, right?
And about the strength of the light, this is really important because it CAN tell you how is your RTK module/device operating. If the red LED is blinking a weak red, it means your RTK module is in ROVER mode. If the red LED is blinking stronger, the device is in BASE mode. I am not quite sure if this is how it works, but it was like that when using Sparfun RTK’s. If all your RTK devices are operating as BASE, this might be a hint about why your radios are not connected, because they will operate as a transmitter station, but not receiver.
Some things that need to be the same on all the radios which are very important are: Net ID, Air Speed, Frequency and Baudrate. Check these, because they set up the communication between radios. You can change these settings all on RFD Modem Tools, I recommend using that software because it is from the manufacture.
Now one thing that did not work for me but can work for you is to check for Node ID. The master node ID usually need to be set to 0. And then the other radios need to have different ID’s like 1, 2 and so on. Since I was working with RFD900+ which were built by the community, I could not change Node ID. But, for some reason, it still worked
Check also your radio models. Some models are not compatible with each other by default because of firewall limitations. You can either check if there are compatible firewalls you can install, or you will need to buy new radios. I do not have much information about this.
Finally, check your radios placements. Bare in my mind these questions:
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Is there any radio antenna close to my radios?
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Am I testing the radios close to a wall or next to a concrete construction?
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Do the radios have clear view of the sky? (When I mean clear, I mean REALLY CLEAR)
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Are there any trees that might be obstructing the connection? (Just don’t chop 'em down)
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Are the antennas big enough for the connection? Should I use one or two?
If you have further questions, feel free to ask!
In my honest opinion, the documentation is not that helpful. Because it offers a very brief and vague troubleshooting. I had to rely on forum posts and technical support to solve my problems. I do not know if you have rad them, but here are few links that a RFD technician shared:
http://files.rfdesign.com.au/Files/documents/Software%20manual.pdf
http://files.rfdesign.com.au/Files/documents/Modem%20Support%20FAQs%20V1.2.pdf
http://files.rfdesign.com.au/Files/documents/Modem%20Support%20FAQs%20V1.2.pdf
http://files.rfdesign.com.au/Files/documents/RFD900x%20Multipoint%20User%20Manual%20V1.1.pdf
You can also check on a more popular thread like this one:
https://discuss.ardupilot.org/t/rfd900x-configuration-and-tests-with-multiple-radios/55382?u=matbarbosa