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[Paparazzi-devel] digi 868 modem


From: Refik Sever
Subject: [Paparazzi-devel] digi 868 modem
Date: Thu, 25 Jul 2013 22:41:39 +0000

Dear all,

We get digi 868 oem modems. Today, we tried them for the first time. Our RC 
transmitter is at 433MHz. After take-off, we couln't use RC transmitter. The 
power of 868 modem was 100mW. 

It also corrupted our ublox GPS module. When we pushed the launch and take-off 
buttons, take-off is written in the GCS. At that moment, GPS gave a pos. acc. 
of 3.6m. However, the autopilot did not give any throttle in auto2. We removed 
the modem, and connected serial cable, then it gave throttle. In some tests, it 
also immediately jumped from takeoff to standby, although we did not take off. 

1. I think that 100mW power was too large. What power level do you recommend 
for communicating within 5km range?
2. Do you recommend to use a filter for RC_receiver and modem? Do I need to 
change RC frequency to 2.4GHz?
3. Do you think that the take off problem was due to GPS error or EMI-EMC 
problem at the autopilot?
4. Is there a tool which calculates the duty cycle of modem depending on the 
telemetry xml file?

Best regards,
Refik


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