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Old Mar 09, 2013, 04:07 PM
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United States, TX, Haltom City
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Two receivers is cheap insurance considering the $$$ you will have invested before your DC-3 is done. That's the way I look at it. When I go to a doctor and get his bill, I say "Well, cheaper than a funeral".
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Old Mar 09, 2013, 04:37 PM
Zor
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Quote:
Originally Posted by Martin5465 View Post

Two receivers is cheap insurance considering the $$$ you will have invested before your DC-3 is done. That's the way I look at it. When I go to a doctor and get his bill, I say "Well, cheaper than a funeral".
I am laughing .
After the funerals if I had , yes "HAD", any money that money is not mine anymore so I will never pay for this racket.

If a corpse is thrown in the river or lake it is disrespect for the individual but if the corpse is burned first (cremetion) and the ashes are thrown in the river or lake that is fine.
You figure _ _ _

I did not try to have two receivers simultaneously bound to the same transmitter. I was expecting confirmation of that possibility.
I can try it here and I will. I was hoping to save some time checking it out.

Zor
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Old Mar 11, 2013, 03:07 PM
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Bath, Ontario
Joined Sep 2007
211 Posts
Two Receivers

The fellow flying that huge Pitts has been doing the two JR Rx thing for years.

Where have you been Zor? You make out like you are on top of this stuff...

Hey Zor

Did you ever put your dial indicator on the 8231? If not I have a couple of spares I could send you one. Give me your address.

Richard
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Old Mar 11, 2013, 10:45 PM
Zor
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Quote:
Originally Posted by cloudniner View Post

The fellow flying that huge Pitts has been doing the two JR Rx thing for years.

Where have you been Zor? You make out like you are on top of this stuff...

Hey Zor

Did you ever put your dial indicator on the 8231? If not I have a couple of spares I could send you one. Give me your address.

Richard
Hi Richard,

I have been where I did not have any urge to use two receivers in the model.

I try to post only about things I have had personal experience.
I will experience that in the next few days.

I do not know if you meant DS821 or JR821 as you wrote 8231.
I have made measurements on a DS821 when we were discussing transmitter resolution like from 1024 to 2048. I wanted to check the resolution available from the servo which I consider the weakest link in that chain of events. It could not even match a Tx resolution of 512.

There was all kinds of unfounded arguments and the discussion just died.

Zor
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Old Mar 11, 2013, 11:31 PM
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Joined Sep 2007
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Zor

A few months back I pointed to a JR 8231 servo that has 5900 steps and very high resolution.

I thought you might have tried your DI on one.

http://www.greathobbies.com/producti...od_id=JRPS8231
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Old Mar 12, 2013, 10:40 AM
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Oh Boy!
Another ZOR discussion thread
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Old Mar 12, 2013, 10:58 AM
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Quote:
Originally Posted by scootrb4 View Post
Oh Boy!
Another ZOR discussion thread
Six people have contributed to this thread.

Did you have something to add, or are you just trolling?
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Old Mar 12, 2013, 01:41 PM
Zor
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Quote:
Originally Posted by scootrb4 View Post

Oh Boy!
Another ZOR discussion thread
Sorry "pal" but this thread was initiated by epoxyearl with a good topic for discussion.

It is not "Another ZOR discussion thread.

Please come to reality and avoid trolling.

I made some tests to back up epoxyearl and posted pictures proving I knew what I was talking about.

You could have done something similar.
Whatever you have against me is not justified; stop it.

Zor
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Old Mar 12, 2013, 02:20 PM
Zor
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Quote:
Originally Posted by cloudniner View Post

Zor

A few months back I pointed to a JR 8231 servo that has 5900 steps and very high resolution.

I thought you might have tried your DI on one.

http://www.greathobbies.com/producti...od_id=JRPS8231
cloudniner,

You are going back "a few months" and I am not and was not aware of such a posting.

I just went to the link and read the advertisement. This advertisement proves nothing. It is just that "advertisement" often written by people not familiar with what they are wrting about (generating advertisement text).

The resolution capability of the electronic pulses presented to the input of a servo following demodulation by the receivers is one thing but the measured motion of a rotating servo is an entirely different thing.

Explaining my understanding and visualization.

The transmitter stick are rotating a potentiometer picking up a DC voltage. That DC voltage would have to have that many possible variations in value to feed into an ADC converter. If it does that . . . fine but I cannot see that a contact on a quite small resistive layout can possibly do that.

Assume the potentiometer has a radius of 0.375 inch (axis of rotation to contact with the resistive deposit) and even less when I look at one of these potentiometer in the transmitter. Then the contact would have to be no more than _ _ _

0.375 x 2 = 0.750 diameter x pi (3.1416) = 2.3562 (the circumference)
and using 300 degrees of that circumference we get
2.3562 times 300 over 360 and the length of the contact becomes
1.9635 inch.

Devide that length by 2048 (not even 5900) we have 0.000959 (less than one thousand of an inch). Such a contact would act like a sharp blade scratching the resistive deposit of the potentiometer.

Then a similar reasoning can be applied to the feedback potentiometer in the servo. Look at the size of the potentiometer in a miniature servo.

WOW _ _ _ enough said. Anyone can come and destroy my understanding and visualization but hopefully bring up some figuration to back up what is written.

Zor
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Old Mar 12, 2013, 05:06 PM
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Bath, Ontario
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Again

Send me your address and I will lend you one of my 8231 servos.

If not I am out of here, don't remember. Right.
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Old Mar 12, 2013, 06:53 PM
Zor
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Quote:
Originally Posted by cloudniner View Post

Send me your address and I will lend you one of my 8231 servos.

If not I am out of here, don't remember. Right.
cloudniner,

I wonder what you are up to.
Are you expecting me to make measurements on this 8231 ?
You may be able to do that yourself.

I do not have something to measure 0.0003324 inch and honestly do not think a servo can move (rotate) in increments 5900 times between its travel limits.

I certainly would like to see someone posting proof of that.
If we consider a rotation limit of plus and minus 60 degrees and a servo arm having a radius of 1/2" it would mean that each increment would be _ _ _
Circumerence = 0.5 x 2 x pi x 120 divided by 360 then divided by 5900 = 0.00017749 inch.

If you have time to loose and the instrumentation you can try measuring that with your servo.

Wish you good luck.

Zor
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Old Mar 12, 2013, 07:47 PM
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Wow ! What predicaments you guys get into !

My servos move the flight surfaces the direction I want them to go,when I want them to go that direction.

I appreciate the input,and the answers. What I needed was the correct testing procedure, and I now have it.

Thanks for helping me through the biggest problem I've had this week.

5,900 steps in 120 degrees ! What a servo ! I had no idea they had advanced that far.
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Old Mar 12, 2013, 10:22 PM
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Bath, Ontario
Joined Sep 2007
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Hall Effect Servos

The next generation?

http://www.jrpropo.co.jp/english/propo/Servo/mph83.html

I am out of here!
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Old Mar 13, 2013, 09:27 PM
Zor
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Quote:
Originally Posted by cloudniner View Post

The next generation?

http://www.jrpropo.co.jp/english/propo/Servo/mph83.html

I am out of here!
Going to the link I could not find any figure referring to the resolution on these servos.

I find that significant and consequently I am not changing my understanding of servo resolution.

Zor
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Old Mar 13, 2013, 09:41 PM
Zor
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Quote:
Originally Posted by epoxyearl View Post
Wow ! What predicaments you guys get into !

My servos move the flight surfaces the direction I want them to go,when I want them to go that direction.

I appreciate the input,and the answers. What I needed was the correct testing procedure, and I now have it.

Thanks for helping me through the biggest problem I've had this week.

5,900 steps in 120 degrees ! What a servo ! I had no idea they had advanced that far.
epoxyearl,

We have no proofs that some servos can have 5900 individual positions between their 120 degrees limits of rotation.

I read that the servos using "hall effect" may be chattering (buzzing? hunting?) on the ground but do not in the air. I would find it difficult or impossible to know or hear if they are while flying.

So much for this discussion. I am out of here also.

Zor
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