Odd sort of interference
10-19-2006 | 09:41 PM
#1
Thread Starter
Odd sort of interference
I'm not sure this belongs on the scale forum but...
I've finished the installation of a pair of mechanical retracts in a Kyosho Me-109 ARF. Everything seems to work fine. But. I noticed an odd bit of interference where I get some momentary activation of the retract servo when I push the elevator stick to either end of its throw and then pull back a bit. I can do this consistently. It only seems to activate the retract servo for a split second and there doesn't seem to be any stick position that causes the gear to come down. Note, I only get this stuttered activation with the gear in the up position.
My best guess is that this is coupled with my complete lack of understanding of how the radio setup for retract servos is supposed to work. They do not respond like other servos I'm familiar with. Currently, I have the radio set up so that the EPA value in the up position in 0 and in the down position it's 100. From what I can tell 100 isn't a critical value. If the down positon is set to 0 the servo doesn't do anything. Then as I move away from 0 I get stuttered action until I hit a critical point at about +17 when the stuttering stops and the gear comes down. I just moved it up to 100 to see if that might eliminate the elevator interference. It doesn't.
Does anyone have a clue as to what's going on here? I sure don't. (Dang, WWII stuff!)
Radio: Airtronics VG6000, retract servo is Hitec (as are other servos on this model).
I've finished the installation of a pair of mechanical retracts in a Kyosho Me-109 ARF. Everything seems to work fine. But. I noticed an odd bit of interference where I get some momentary activation of the retract servo when I push the elevator stick to either end of its throw and then pull back a bit. I can do this consistently. It only seems to activate the retract servo for a split second and there doesn't seem to be any stick position that causes the gear to come down. Note, I only get this stuttered activation with the gear in the up position.
My best guess is that this is coupled with my complete lack of understanding of how the radio setup for retract servos is supposed to work. They do not respond like other servos I'm familiar with. Currently, I have the radio set up so that the EPA value in the up position in 0 and in the down position it's 100. From what I can tell 100 isn't a critical value. If the down positon is set to 0 the servo doesn't do anything. Then as I move away from 0 I get stuttered action until I hit a critical point at about +17 when the stuttering stops and the gear comes down. I just moved it up to 100 to see if that might eliminate the elevator interference. It doesn't.
Does anyone have a clue as to what's going on here? I sure don't. (Dang, WWII stuff!)
Radio: Airtronics VG6000, retract servo is Hitec (as are other servos on this model).
10-20-2006 | 10:49 AM
#2
My Feedback: (2)
RE: Odd sort of interference
Abu
youre right it seems weird, check if you have any mixers linked to the switch you are using for the retracts.
Im afraid Im not familiar with Airtronics transmitters but I had a similar problem with a Graupner Mx22 only to find that i had assigned mixing to my flap switch.
Hope it helps
Loukis
10-20-2006 | 11:06 AM
#3
Thread Starter
RE: Odd sort of interference
Loukis, thanks. I just checked that and that wasn't it. But I started fiddling with the gear settngs on the radio and when I shilfted the "up" setting to -100 (with the down at +100) the stuttering disappeared. Hooray!
As I said I really don't understand what the End Point Adjustment settings do on a servo that alwys moves 180 degrees no matter what. Obviously, it is somehow related to "sensitivity" but why would one want "variable activation sensitivity?"
As I said I really don't understand what the End Point Adjustment settings do on a servo that alwys moves 180 degrees no matter what. Obviously, it is somehow related to "sensitivity" but why would one want "variable activation sensitivity?"
