Okay - I give up!!!!!!!!!!
I am using v.1.03 HFP-10. NEW 5955's...have studied (downloaded, even) the "DownontheDeck" programming videos. I'm either stupid, can't understand, or something is screwy.
Single-servo wings....setting "center" so arm is parallel to hinge line. Press "M", then "Input", then set both ends (roughly). Press "Input" to save, power off.
Plug into JR 955, with measured (new TX) JR 10, and the center doesn't match. No subtrim is in radio, no mixes, etc.
If I recalibrate with the programmer, I can get it close, but then when reprogramming max travels, it resets the CENTER, too.

What am I missing here?

Yes, I already did "Program Reset", and I've measured the pulse coming out of the RX, and it's right.

Bob,

The programmer should be updated to reliably interface with the revision v1.04 5955TG servos. The deviation from programmed parameters is an anomaly realized with v1.03 firmware > v1.04 amplifiers.

Why is setting the servo arm parallel to the hinge line of interest? More likely than not you’ll need to have several degrees offset at the servo arm to the rear to find the surfaces travel arc center.

The Linkage Design software you have should estimate very closely the exact offset required or the paper protractor method works real well too.

I believe the issue is that JR, Futaba and HiTec designates the pulse for center and endpoints differently. If you had a HiTec radio, it should be dead nuts on...

That's my only issue with the programmer... it would be nice to calibrate it to a specific radio... so that the programmed pulses matched that of the radio.

Maybe that would be a great feature... or better yet, a USB computer interface that would allow connection to a PC, with auto calibration of the radio.

The way around it is to calculate the pulse offset and add/subtract it to the Hitec numbers. So if you are hitting zero on the programmer, but the JR radio is putting out 50 or whatever... you might need to program the servo with -50... THen when the JR tells it to center... it's back where you want it.

Maudib,

While you have provided some valuable insight into the varying pulse outputs realized by different TX's, in this case with a JR TX that was reported to be on the number at center (1500us) the problem is specifically related to using the previous version firmware v1.03 programmer.

FWIW: JR equipment is generally right on the desired 1500us pulse-width at neutral. Sub-trim can be used to locate the arm where desired if the output signal is several numbers away from 1500us. There are many choices with the programmables...

Amen

Allright I here you guys and yes it would be nice to have a TX matching calibration thinngamjig for those TX's thta don't provide 1500us for servo center signals...

The link to Aeroperfect below provides two MS Excell spreadsheet programs that make things a might easier for you... Check Aeroperfects digital throw meter too.

http://www.aeroperfect.com/program.html

Michael, as always, your information and insight is invaluable, no kidding.
Last night, after a couple hours of t&e, I stumbled on the "magic" of the "offset" for the center number, and have purchased a programmer that will have the v. 1.04, so that problem should be solved.

Re the "parallel" servo arm to hinge line.... dealing with pattern birds for years PROVED to me that if they are NOT, you will have ASYMMETRIC travel due to the rotational nature of the arm moving off center. Let's say "left" aileron is FORWARD of hinge line, and "right" is AFT of hinge line. At the first movement off center, asymmetric control deflection will occur, because "mechanical" differential caused by the difference in the radii of movement, and in fact, the travel will remain asymmetrical.

Set one up with the arm parallel, and the other NOT, and measure the deflection in BOTH directions. I guarantee a significant measurable difference between the two will be present. It is a "mechanical" anomaly that the programmer cannot fix.

Bob,

Your correct on the asymmetrical offset, the reasons are typically due to the horn placement and height in relation to the servo output shaft and weather or not the control arm pivot is centered over the hinge line or not. That said the programmables are capable of overcoming these short-comings for the most part...

Thing is you need to find the center of the surfaces travel arc first or prior to programming anything, you'll find it’s NOT parallel with the hinge line in nearly all cases. Once you find the surface centerline equal travel volume from the servo will provide equal surface deflection in both directions provided the ATV values are equal and the servo is traveling in equal amounts either side of neutral.

The Programmer you utilized can be updated free of charge by Hitec Service..