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FBL and FM - 2/4/2013 6:21 PM   
flycatch


 

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Status: offline 		I was told you can't use a FM/PCM to hook-up a FBL set-up. Is this true?

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RE: FBL and FM - 2/5/2013 4:48 PM   
Solman


 

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Status: offline 		The only problem I could see is that for some fbl systems, they need a 2048 resolution.  I personally don't see why 2.4 or FM would make a difference. 

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RE: FBL and FM - 2/5/2013 5:00 PM   
flycatch


 

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Status: offline 		You answered my question. Resolution and frame rate are one in the same I assume. FM PCM has a frame rate of 1024.

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RE: FBL and FM - 2/5/2013 5:39 PM   
BarracudaHockey



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Status: offline 		Not at all the same.

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RE: FBL and FM - 2/5/2013 11:20 PM   
flycatch


 

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Status: offline 		So, it is not the same. The question still stands can I use FM/PCM on a FBL system.


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RE: FBL and FM - 2/6/2013 1:30 AM   
Solman


 

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Status: offline 		From my research, resolution is what is in the radio and frame rates deal with the servo and receiver.  If your radio has 1024 resolution, I would suspect that it should be fine for a fbl system unless it needs the 2048.  I know that the beastx will work with 1024 because it worked well with my 9303 with the DM9 module.  It had a low resolution and I had problems with it when I tried to use it with the 3GX and Ikon.  But as I said, it worked fine with the beastx.

frame rate explained:

 http://www.spartan-rc.com/resources/faq/faq.php?topic=1

quote:

 Resolution refers to the number of steps your radio has in its range of motion.   


http://www.spektrumrc.com/Technology/Resolution.aspx


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RE: FBL and FM - 2/7/2013 1:38 PM   
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Status: offline 		I doubt that any servo will have a 2048 resolution, maybe not even 1024. The manufacturers are very tight lipped about the resolution of servos.

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RE: FBL and FM - 2/7/2013 5:45 PM   
Solman


 

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Status: offline 		Actually they tell you exactly  what the frame rate is.  They show it as HZ.  200, 333, etc. 

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RE: FBL and FM - 2/18/2013 3:49 AM   
jackeylewis


 

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RE: FBL and FM - 2/18/2013 10:41 AM   
spog1


 

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quote:

Actually they tell you exactly what the frame rate is. They show it as HZ. 200, 333, etc.

Frame rate and resolution are completely different performance specifications. I have never seen a manufacturer publish resolution data, even when asked on this forum. I doubt ANY servo has a 2048 resolution. Hitec even advertised doubling the resolution of their servos, but they still would not tell you what the resolution is. My guess is that they went from 256 to 512.

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RE: FBL and FM - 2/19/2013 12:36 AM   
Solman


 

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Status: offline 		Can you explain the difference?  I have been looking all over the internet and I went off with what information I found. 

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RE: FBL and FM - 2/19/2013 1:07 AM   
spog1


 

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Status: offline 		I'll try to keep it simple.
Frame rate is the number of position commands that are sent to the servo every second. If you send out 1 command per second, the servo can only change it's position once every second.
Resolution applies to digital signals. Since modern radios and servos are computerized (digital), they deal with numbers. So when the radio sends out a signal to the servo, it effectively sends out a number. If the radio has a resolution of 10, then it will send out a number from 1 to 10 to the servo. The servo then can at best move to 10 positions evenly spaced within it's travel range. In this case if the tx stick is moved from one end to the other slowly, the servo would move in steps to 10 positions. This of course would be unacceptable for rc use. The servo is also computerized if it's a digital servo, and it will have it's own resolution. The servo will be limited to the resolution of the radio or the servo, whichever is less.
If you use an analog servo, it can move to an infinite number of positions, but will move in defined steps if the radio is digital.

I'm not the best at explaining things, maybe this will be easier to understand.
http://www.allaboutcircuits.com/vol_1/chpt_9/1.html

When it was stated above that FBL requires 2048 resolution, I doubt that can be achieved with any digital servo. It can be achieved with a 2048 resolution radio and analog servos. Many fbl setups run just fine with digital servos which I think will not have a resolution of 2048.

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