RE: [Paparazzi-devel] RE: distance measurement for landing. (Chris)

[gisela.noci]

Chris, sorry, just one more thing. The 1/2watt is questionable... The sensor
is transformer driven by the direct output port pins of a PIC processor -
this processor cannot deliver 1/2 watt on its port pins, ignoring the fact
that 1/2watt of AF power would need more than that at the port pins due to
transformer losses, transducer to air coupling losses, etc. A little Poetic
license in use maybe?

Joe.

-----Original Message-----
From: address@hidden
[mailto:address@hidden
] On Behalf Of Chris
Sent: Tuesday, November 10, 2009 9:09 PM
To: address@hidden
Subject: [Paparazzi-devel] RE: distance measurement for landing. (Chris)

Hi.
I can also verify what has been said.
When i was using a baro for altitude in an another good airborne 
telemetry unit i got tired from altitude drift.
0 meters during take off were becoming ~5 meters after 30 minutes of flying.
Joe what do you think about the MAXSONAR's XL series (not the LV)?
Have you tried them also?
They state that the XL units use 40v and produce about 1/2 W of AF power.
Chris



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