[TowerTalk] Odd T2X behavior RESOLVED
cw_de_n5op at sbcglobal.net
Wed Apr 2 21:26:45 EDT 2014
I wanted to let anyone curious know that my odd T2X behavior has been
resolved. After speaking with Jeff, W2FU, I learned that Green Heron
controller can be susceptible to AC induced on the direction signal
line. This can occur under various conditions and I apparently enjoy at
least one of them. The fix is to install a 100 uF capacitor between
terminals 4(+) and 3 (GND). I did so and now everything is smooth as silk.
On 4/2/2014 9:49 AM, Kimberly Elmore wrote:
> I have two T2X rotors and just replaced one that jammed with one I have recently rebuilt, complete with a new direction potentiometer. All was well until a couple of days ago, when I noticed that approaching the CW end of rotation, I couldn't get a direction indication beyond about 160 deg yet, when the brake disengaged, the direction indication went to 180 deg. Playing with it some, the problem has worsened such that I don't get a good direction indication much south of about 120 deg or so, though it clears up when the brake is disengaged. I initially thought it was contaminates on the wiper arm, but the change in direction indication is so consistent with brake actuation that I am no longer confident that contamination on the wiper arm is the problem.
> The rotor has the AMP connector installed and tested good on the ground. I'm using a Green Heron RT-21 controller.
> I'm beginning to suspect either a bad connection in the ground pin of the rotor. After insuring that the basic resistance checks yield nominal values, I plan to go up and visually inspect the connector and plug. An "out there" scenarios is if, for some reason, the internal common ground developed a problem under brake activation (due to excessive, but not outrageous, resistance) brake current could be divided between a poor ground and the the grounded wiper of the direction potentiometer, yielding both a burned up direction potentiometer (at least on one end) and strange direction indications. Has anyone ever seen problems with the *internal* grounding of the T2X or a direction indication vary considerably related to brake actuation?
> Kim N5OP
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