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I also have no clue what they stand for, but I know if it drops below 40, you will loose connection. I have now good results with the 915MHz home made antenna's. At 8.5 Km still have good connection with RSSI and REMRSSI slightly above 50. So I think I can go up to 10Km.
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Last edited by farmertom; Oct 24, 2013 at 06:48 PM.
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Yes, it is the RSSI from the 3DR radio and not the receiver. You are probably using the stock antenna's. They suck. Those are 2.4 MHz antenna's and bundled with the radio. They are OK if you are flying in close proximity. If you want more range, you need to modify them or build (or buy) other antenna's. A few pages back I made a post regarding this, page 7 and page 12.
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Thanks farmertom |
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rxrssi is your RCRx |
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At home (if you haven't OSD setup yet) you can plug USB cable to APM and computer. Check in Mission Planner if you can get info from APM. Switch on your transmitter select Manual mode, throttle idle. Then connect flight battery in plane. In Mission Planner you should see current flight mode - Manual. Then just switch off the transmitter. Motor will not run as APM knows that you didn't fly. In Mission Planner check the mode. It should be RTH now. Switch on transmitter again. In second or less you should see Manual mode again. In flight before check of RTH you should check two modes: stabilize and FBW-A. If they are Ok then you can proceed with RTH. Be sure that in Mission Planner you set safe altitude as 50-100 meters AGL not MSL. |
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So on the plane I have a modified 2.4 GHz, on the groundstation a Yagi. You can see from the graph, RSSI and REMRSSI do not drop below 50, at almost 8 Km distance. Yes, I am an antenna guy ![]() |
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Last edited by Pattaya01; Oct 25, 2013 at 02:38 AM.
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![]() thanks farmertom |
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![]() I looked at my flight log again looking for the rssi of my tx radio. My current set-up is a FrSKY DJT tx and rx. The value for the rxrssi parameter was about 20, but remained constant though out the flight. Again anyone know what the units are for that parameter? Is that good or bad? any comments? Thanks again farmertom |
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Have you discussed this with the 3DRobotics people. Seems like a mistake they would want to fix. |
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Me again,
I am posting the graph of the first flight, showing the rssi and noise of both the tx and the rx radio, distance from home and the rc radio rssi (I think the parameter has been renamed). Looks like I almost lost the connection between 12:37 and 12:38. I found how to convert the raw data from the graphs to signal dBm. signal_dBm = (RSSI / 1.9) - 127 Comments? thanks farmertom |
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Last edited by farmertom; Oct 26, 2013 at 08:35 AM.
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You can remove the cover but you have to use a bit of force. They are pretty tight fitted. The wire diameter you use is not important, the length is important. I am using the core wire from a coax cable, which is about 1mm diameter. It's quite stiff because it is not 100% pure copper wire, but bronze. By the way, I found a way to make the graph more clear. If you first left click on RSSI and REMRSSI, you can then right click on DIST_HOME. Try it and you will be surprised. |
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Last edited by Pattaya01; Oct 25, 2013 at 07:42 PM.
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