What is the Resolution of the Old Analog RC Transmitter?

[lazy-b]

What is the Resolution of the Old Analog RC Transmitter?

Look like the Old Analog system is more reliable and offer a much higher resolution than the current Computer Radio.

I guess, this Analog Transmitter could exceed the Resolution of the Newest Futaba 14MZ.

a servo pulse varied from 1 to 2 millisecond, that about 1 millisecond range.

a 1024 resolution gives 1/1024 millisecond , thats about 1 microsecounds
a 2048 resolution give 1/2048 millisecond , thats about 0.5 Microseconds

The Theoretical resolution of the Analog is Servo Pulse Range / Propagation of Delay Semiconductor used in the Circuits
Analog Servo Pulse Range is 1 millisecond
The Propagation delay of most TTL is about 10 Nanasecond.

Theoretical Analog Resolution is 1 Millisecound / 10 Nanoseconds = 100,000 steps

Has any one tried measuring the resolution of this old analog Transmiter ?

Ellion

[Acetronics]

Hi, Ellion

the resolution of Tx/Rx is theoretically infinite ...as the pulse can really be whatever value you want ...

BUT, as you have some dead band in the servo amplifiers and some play in the control surfaces rods and hinges ... the full chain resolution is a bit less ( humour ! ).

note propagation delay doesn't modify the signal resolution : consider it as a "delay line" ... supposing L>H and H>L delays are the same and constants ( re-humour ).

All these points are very theoretical ... as the pilot closes himself the "close loop" regulating system ...

let's say, for piloting, 9 to 10 bits resolution AT THE Rx OUTPUT are more than enough !!!

By the way ... interesting question ...

9 and 10 bits ... are they relative to the 1-2 ms signal, or the 0-1 ms signal variation ...???
I've never seen that clearly written somewhere ...

and 1 more bit of resolution !!!, one !

Alain

[lazy-b]

Alain, Yes.....Your Right......This means the Old Analog Transmitter will give a much Higher Resolution and a Much Faster Latency Time (Stick to Servo respond time).

My Futaba 9CHP Radio has the worst latency time.......

The resolution is base on 0-1 ms Signal Variation.......that 1 ms is a Constant Pulse (fixed) and we add the 0-1 ms Signal Variation.

and 1 More Bit of resolution, mean could Double the resolution....9 bits is 512 steps, 10 bits is 1024 steps, 11 bits is 2048 steps

Just an Idea,

to have a maximum resolution and a Mininum Latency time, been thinking we could use the Old Radio system of sending the stick position to the Receiver..... the Mixing of signal such as those CCPM mixing could be done on the Receiver side.

Ellion

[Acetronics]

Hi, Ellion

the max latency time is ... 25 to 20 ms ... as a position is updated @ 40 or 50 Hz ... ;)

20 Years + ago ... a man called Francis Thobois, had the idea to transmit a numeric signature ( cheksum ?) with the classical analog pulse train ... :p

He conceived the transmitter and receiver on this principle ( 68HC11 + 68HC ??? ). note receiver could ALSO work with classical PPM transmitters ...

... :censored:

May be some old plans still on his site ... http://home.nordnet.fr/~fthobois/

Yesssssss !!! Those are the "latest brews" ...

http://home.nordnet.fr/~fthobois/anglais/introstf96.htm
http://home.nordnet.fr/~fthobois/anglais/introrx19.htm


no, no ... I won't laugh, you're a friend !!!

Alain

[lazy-b]

Alain,

Very Interesting website........

Been thinking of Upgrading my old 72 MHZ Futaba 9CHP.......to a 2.4 GHZ .....

Look like the Specktrum DX6i is worth value for money, this is the cheapest 2.4 on the Market.......I have only 2 Choice (Spectrum and Futaba Fast)

Thanks

Ellion

[Acetronics]

Hi, Ellion

Third choice HERE:

http://www.o24rcp.org/

... ahaaaaaaa !!!

Alain

[lazy-b]

Alain,

Wow....what a Great Site.....I'm sure its really more expensive than buying a Spectrum.

There are lots of 2.4 GHZ available here locally in the Philippines, we have ASSAN, IMAX, Spektrum and Futaba Fast........I rather go with something Tested and very reliable........I guess, Spektrum is the most popular 2.4 GHZ in the world.....next to Spektrum is Futaba Fast......Been thinking of getting a Futaba but the Futaba Fast Receiver is more expensive than Spektrum Receiver

I like the Transmitter/Receiver Module of that Xbee......its very ideal for my telemetry projects.

Ellion