I read that the modems will be running @ 57000 on version 2.1. I have already purchased the 900MHZ XSC modules which are limited to 9600. Can the baud rate in 2.1 be slowed down to 9600 with a simple change as in the past. I'd hate to have to toss these new modules that haven't even been used yet.
You need to be a member of diydrones to add comments!
I think you won't be left alone with this problem. Many probably have bought Pro XSCs in North America and Pro 868s in Europe. I'm in the latter case. The problem with both are lower bandwidth compared to the shorter range Xbee. In the case of the XSC, I wonder how they could be integrated fruitfully for other purpose than just little up or downlink. they have only 9600 bps throughput data rate. The 868 is a little faster, with 24000 bps RF data rate, but it is still not possible to burst data through them continuously. With both, if you push them too hard with the data stream, they stop transmitting and wait for cooling down. A way to have them up transmitting longer is to cool the square chip on them as low as possible. In the airframe, you may leave the module apparent on the surface, or stick a heatsink on it. As to the ground module, the way I'll do in summer is probably coupling it to a CPU ventilator.
But anyhow, those are not RF modules which could be used for flying a plane remotely from the ground. For this you need the faster Pro 900 with 156 Kbps RF data rate, or the Pro 802.15.4 with 63mw and 250 kbps RF data rate (1 mile range). By the way, do you or others know what is inside the latest Graupner MX16 and Mx22 IFS bidirectional "transmitters"??? A 2.4 GHz Xbee module!!! They probably know why!
Replies
First, we're using different Xbee 900 Mhz modules (air, ground), which support 56,000, unlike the ones you have.
The baud rate in ArduPilot 2.1 cannot be slowed down to 9600, since the code is optimized to read the GPS in binary mode at a higher speed.
But your problems will probably be solved in ArduPilot 2.2, which will return to an NMEA parser running at 9600.
But anyhow, those are not RF modules which could be used for flying a plane remotely from the ground. For this you need the faster Pro 900 with 156 Kbps RF data rate, or the Pro 802.15.4 with 63mw and 250 kbps RF data rate (1 mile range).