The Spektrum tx puts out 45 frames per second. A fade occurs when any bit of
data in that frame is corrupted or lost or whatever. A frame loss occurs when
the receiver detects a fade in the same frame from each receiver. On a AR6100
that would be one receiver, on a AR6200 and AR7000 that would be two receivers
and on a AR9000 or JR921 that could be three or four receivers. A hold occurs
when the receiver detects 45 consecutive frame losses. Or you could say one
second of bad or corrupted data.
How do you define what is good or bad? Well in a ten minute flight with a
Spektrum system there are 27000 frames of data (45 frames per sec X 60 sec/min
X 10=27000). On my 2.4 friendly Pike I avg about 30 to 150 fades per rx with a
frame loss of less than 50 and 0 holds. Now I don't think that is to bad. On
one flight I had in the high 200 to low 300 fades on each rx but only 1 frame
loss and 0 holds. I still thought that that was good. Remember that in 10
minutes there are 27000 frames. I probably would not start worrying until the
frame losses got a lot higher and the holds increased above something like 10
or twenty. On that one flight that I had so many fades I was quite high right
over head and it is quite possible that I had the ant. pointed right at the
ship. I feel that one should never point the 2.4 ant. right at the aircraft
but should have it perpendicular to an imaginary line extending from the tx to
the plane.
Walter> Date: Mon, 3 Mar 2008 11:01:13 -0800> From: [EMAIL PROTECTED]> To:
[email protected]> Subject: [RCSE] Data Logging> > I'm curious with the new
found religion of using an in flight glitch > counter (data logger) on the 2.4
stuff if anyone has any data from 72 > band radios?? It would be interesting to
know how they compared.> > It would also be interesting to know what the
failure threshold is for > packet loss. How many packets need to fail, how many
in a row, etc. > before it results in an actual loss or degradation of
control.> > > > > > RCSE-List facilities provided by Model Airplane News. Send
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