ThunderTiger
Hardcore RCTalk User
Hi all, just upgraded to a spektrum DX3 Tx with an SR 300 Rx controlling two futaba S3305 servo's (metal geared) and i think that i may have a problem somewhere.
My problem (at least i THINK its a problem), is that even after setting the radio adjustments correctly (as far as i know), my throttle/Brake servo and my Steering servo "Buzz" (Or Humm depending which way you look at it). If i tweak the throttle trigger, or steering, it sets back to its neutral position and stops "Buzzing" for a few seconds then starts again. Is it just me being stupid or is it the servo's or radio ?? I'm a noob at these DSM radio's so i'm not sure. What i DO know, is that it never did this with my 40MHz Futaba T2PL Tx, which is why i suspect i have a Tx setting out of whack somewhere.
Could it be because i have an extra "Return" spring on the Throttle/Brake servo ? but then, thats kinda ruled out as the steering servo does the same without any extra "force" trying to bring it back to a neutral state.
When i set the radio up this is what i did
Transmitter
1) Set ALL adjustments to Zero (Thats "0")
2) Check Rx & Tx Were Bound correctly.
Throttle/Brake:
1) Removed the servo horn to allow natural neutral center point with radio on.
2) Checked servo operation with no servo horn and thus no load for correct operation.
3) Pulled throttle trigger back to full open (Tx) and refitted Servo horn with carb at a shade under fully open (app .25mm).
4) Re Checked operation of throttle action (all O.K.)
5) Set E.P.A for brake so as not straining servo.
6) Checked throttle and brake operation. All O.K, no problems, working as it should.
7) Re-Checked steps 5 & 6
Steering Servo;
1) Removed the servo horn to allow natural neutral center point with radio on.
2) Refitted servo horn with servo at natural neutral centre point and wheels set facing straight ahead.
3) Re Checked operation of steering action with wheels on the floor(all O.K.)
5) Set E.P.A for steering so as not straining servo.
6) Checked steering operation. All O.K, no problems, working as it should with no binding evident.
7) Re-Checked steps 5 & 6
Now, correct me if i did something out of the ordinary here, but removing the servo horns to re-adjust for a new radio is something i have always done. Not for the fun of it, but to ensure that both servo's have a "Natural Neutral Center point" with the ne Rx / Tx combo.
I have checked for "Metal To Metal" contact and there is none, with the exception of the mounting bolts to the aluminium servo arms, but the mounts are solidly fixed without any play or without being loose. I have tried all the trricks i know to see what is causing it bar swapping out the servo's. I Even went over my linkages, but there is still no "Metal to Metal" contact excepting the servo horns. I even tried plastic servo horns but to the same ends, the Buzzing (or humnming) is still happening.
Is there something i have missed ????
My problem (at least i THINK its a problem), is that even after setting the radio adjustments correctly (as far as i know), my throttle/Brake servo and my Steering servo "Buzz" (Or Humm depending which way you look at it). If i tweak the throttle trigger, or steering, it sets back to its neutral position and stops "Buzzing" for a few seconds then starts again. Is it just me being stupid or is it the servo's or radio ?? I'm a noob at these DSM radio's so i'm not sure. What i DO know, is that it never did this with my 40MHz Futaba T2PL Tx, which is why i suspect i have a Tx setting out of whack somewhere.
Could it be because i have an extra "Return" spring on the Throttle/Brake servo ? but then, thats kinda ruled out as the steering servo does the same without any extra "force" trying to bring it back to a neutral state.
When i set the radio up this is what i did
Transmitter
1) Set ALL adjustments to Zero (Thats "0")
2) Check Rx & Tx Were Bound correctly.
Throttle/Brake:
1) Removed the servo horn to allow natural neutral center point with radio on.
2) Checked servo operation with no servo horn and thus no load for correct operation.
3) Pulled throttle trigger back to full open (Tx) and refitted Servo horn with carb at a shade under fully open (app .25mm).
4) Re Checked operation of throttle action (all O.K.)
5) Set E.P.A for brake so as not straining servo.
6) Checked throttle and brake operation. All O.K, no problems, working as it should.
7) Re-Checked steps 5 & 6
Steering Servo;
1) Removed the servo horn to allow natural neutral center point with radio on.
2) Refitted servo horn with servo at natural neutral centre point and wheels set facing straight ahead.
3) Re Checked operation of steering action with wheels on the floor(all O.K.)
5) Set E.P.A for steering so as not straining servo.
6) Checked steering operation. All O.K, no problems, working as it should with no binding evident.
7) Re-Checked steps 5 & 6
Now, correct me if i did something out of the ordinary here, but removing the servo horns to re-adjust for a new radio is something i have always done. Not for the fun of it, but to ensure that both servo's have a "Natural Neutral Center point" with the ne Rx / Tx combo.
I have checked for "Metal To Metal" contact and there is none, with the exception of the mounting bolts to the aluminium servo arms, but the mounts are solidly fixed without any play or without being loose. I have tried all the trricks i know to see what is causing it bar swapping out the servo's. I Even went over my linkages, but there is still no "Metal to Metal" contact excepting the servo horns. I even tried plastic servo horns but to the same ends, the Buzzing (or humnming) is still happening.
Is there something i have missed ????