>The Futaba S3003 servos I bought didn't have any pulse width >specifications with them. The generic servo docs I've been able to >track down suggest that the pulse should be 1-2ms wide. Sure enough, >the "long" pulse to turn the S3003 all the way to one side is about >2.3ms. But the "short" pulse to turn the servo the other way is quite >a bit shorter than 1ms, it's something like 270us. Just because it works doesn't mean it's right to do it. >The guy at the R/C store who sold them to me didn't know the pulse >width bounds, but he told me that the neutral position is "always" >1520us; I'm finding it's closer to 1290us. > >Does anyone have real specs for Futaba S3003 servos? I make a living driving these servos, believe it or not. Center on "new" Futaba servos (connector on servo is a female) is 1500uS, with other limits at 1000uS and 2000uS. Don't know where he came up with 1520. Most transmitters allow you to transmit out-of-range values (typically 900uS to 2200uS), and the servos (because they're analog ) respond just fine. If you play around with a carefully calibrated, oversized protractor and a long arm on the servo output, you will find that the range from 1000 to 2000 uS is rather linear. Outside of that, things get less linear (one side will be much more responsive per uS than the other). If you servo does not look centered at 1500 uS, you have the output arm on wrong. It is NOT symmetrical due to the splines on the shaft. They did that on purpose. Just remove the output arm, rotate about 90 degrees, and replace. If that doesn't make it centered, go 90 degrees more, etc. For a better (ie, better quality and cheaper) visit http://www.fmadirect.com Andy ================================================================== Andy Kunz - Montana Design - 409 S 6th St - Phillipsburg, NJ 08865 Hardware & Software for Industry & R/C Hobbies "Go fast, turn right, and keep the wet side down!" ==================================================================