ORIGINAL: Gungadin Anyone besides me think it a little strange that the new A9 is 1024 resolution, when 2048 has been with us for more than a year with Futaba. Not sure it means a lot with the flying experience, but I would think that when you bring out a new radio which you know will be compared to what else is out there, that you would want it to match up with the competition. And I believe the A9 does match up very well except for the 1024 VS 2048 resolution spec. Wonder if anyone else thinks this may be an issue ?
Resolutioncovered *********** thread(Hitec Aurora 9 announced)
post #234
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Quote: Originally Posted by knighttwister
i thought resolution was the amount of information the servo receives and how the servo is able to understand it. the potentiometer is the endpoint of the information transmitted by and received by the two ends of the radio signal system.
the bands on the pot just aren't narow enough to carry all that resolution to the gear train.
it's like the lines of resolution on a tv. the more lines the tv can receive, the clearer the picture.
or am i wrong again?</span>
Not directed at knighttwister, he just asked a good question.
Resolution in the transmitter and at the servo are not exactly the same thing, the Tx works in digital and servos (even digital servos) receive their commands in analog mode. A servo determines its position based on the length (in time) of a pulse that is sent to it from the Rx.
I think there may be a misconception that with digital servos the information is digital end-to-end, this is not the case. It actually goes from digital to analog, back to digital in the servo (sort of, not really) and is then referenced to an analog positioning sensor.
The transmitter (in 2.4 systems and in PCM) sends the commanded servo position out to the Rx in digital format, a number between 0 and 1023 (1024) or 0 and 2047 (2048). The receiver then converts that number to a time period for the length of the pulse to the servo. This pulse itself is not all that precise, the exact moment of on/off status is left up to the servo to interpret as the edges of the signal are not perfectly square.
Given the conversion to analog time pulse, and the relative imprecision of the analog signal, I find the discussion to be pretty meaningless. I have serious doubts that anyone can tell the difference flying the plane.
You guys are getting all upset about marketing stuff. If this was a CNC machine tool with stepper motors working in a medium where thousandths of an inch can be measured then I'd say you have a point. But you are working with wood and fiberglass moving in a medium of air that is moving around. It seems like you are talking about how many angels can dance on the head of a pin. TF., Wildhare RC".
As a previous author said same thread
"1024 or 2048. does it matter? are there many servos out there that can actually take advantage of 2048?
Regards
Alan T.
Alan's Hobby, Model & RC FAQ Web Links</p>