Radio Modem For Attopilot ... ?

[fuzna]

hello,

I would like to buy the attopilot and have one asks to a radio modem.

here in germany is 868/869 MHZ alowed.but all modem´s in this band use a DUTY CYCLE limit.it´s possible to use this 10% duty cycle modul with the attopilot ???is this quick enough for telemetry ?

z.b. XBEE PRO 868 500mW and 10% dutycycle


cu olli

[s.parkas]

Without further ado, you might want to check this out: http://paparazzi.enac.fr/wiki/Modems

In short, a safe bet would be the Aerocomm modem (AC4486) at 868MHz with 5mW TX power which under normal circumstances should provides 1000m+ range. Optionally the AC4868 drop-in replacement with 250mW TX power and the 10% duty cycle limitation (868MHz issue covered by Paparazzi url above).

Maxstream and XBee are equally well suited, however you will need to evaluate their behaviour once you hit the 10% duty cycle (e.g., will they transmit at 100% TX power and then stop working (6minute out of 1h) or just intermittently drop a packet to stay under the 10% TX duty cycle like the Aerocomm AC4868 does).

Cheers,
Simon

[air]

I've done pretty extensive testing on the Digi (formerly Maxstream) 868Mhz units and have concluded that they are more than sufficient for what I need - sending back position and some limited telemetry at about 1hz.
I've yet to test them in the air but am pretty confident that they will prove a great solutino based on my ground range.