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Other › GY401 & XP8103 Setup Question
01-22-2007 09:48 PM  10 years agoPost 1
chopperscott

rrApprentice

oak ridge, tn

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Hi, I recently got a GY401 for the T-rex and I wanted to ask if anyone can give me some tips for setup with my radio. I'm using a hitec electron6 rx, a PHX45 esc with UBEC. I have the 3-wired connector from the gyro to channel 4, and the signal wire(the one with one wire) to channel 5. The two wires from the ubec I have run into the same connector as the single wire from the gyro. (Hope this is making sense).
I need some help as far as programming the radio for the remote gain and/or the avcs/normal mode settings. The gyro I was using before was not equipped with the remote switching option.
Also, is the LED on the UBEC supposed to remain on constantly? The instruction sheet doesn't say anything that pertains to the LED.
Thanks for looking and for any help.

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01-23-2007 12:23 AM  10 years agoPost 2
chopperscott

rrApprentice

oak ridge, tn

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Anyone? I'm wondering about the avcs mode vs normal mode settings on the radio. Do I need to program both the aux 2 to gear settings for avcs and normal; and then also program the gyro sens settings for the flight mode switch? The more I read the more confused I am!

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01-23-2007 05:05 AM  10 years agoPost 3
chopperscott

rrApprentice

oak ridge, tn

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Come on guys, I'm talking to myself! What I really want to know is do I use one method or the other (manual mode via the gear channel to switch from avcs to non-hh, or auto mode via the gyro sens function? It seems to me to be one or the other, not both. Anyone?

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01-23-2007 05:42 AM  10 years agoPost 4
AWittleWabbit

rrElite Veteran

O.C., CA

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I'll give you my settings when I get home in a couple hrs. I used the gear channel for remote gain. Y do you want to switch out of HH anyway? With a 7 ch reciever you can use the auto gain switching function. I now use the JR 790 pcm reciever. You will need ch 7 to use the automatic mode. I'll post back in a while.

edit for rotten grammar

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01-23-2007 10:36 AM  10 years agoPost 5
AWittleWabbit

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O.C., CA

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Whoops, I put the R790 in before I made the switch to a SE. I don't have what setting I use in ch 5 (gear) saved anymore.

JR 8103

So, you will need to set your gain via ch 5. Do this by using the travel adj. screen in your 8103. If you refer to the 401 instructions, I believe anything under 50% is non HH. You will have to dork with the travel adj to set your gain.

Now, the tricky part for you is setting your ch 5 travel to 75% is NOT the same as 75% gain like it would be in the gyro sens screen in the 8103!!!!!!

If you set your travel to 40% (gear ch) that is close to 70% gain. How do I know this you ask? Look in the screen labeled MONIT. I set my gain to 70 via the gyro sens screen. The aux 2 slider is pretty close to the same spot as my gear ch with the travel set to 40%. (I checked for you) That is a handy screen to use. I flew this way for quite a while. See my gallery.

Since the gear switch is 2 position, you can have 2 different gains. Unfortunately, I don't believe you can set the low end of ch 5 high enough to not come out of HH. You will have to make sure the switch does not get flipped. If you didn't know, auto mode switches gains for you when going from normal, idle1, and idle2 to whatever you set it to. BUT you will need a 7ch reciever to make use of this function. If you have trouble grasping what is going on, the MONIT screen is very handy to see what flipping the switches is doing.

Let me know I can clear things up more. Clear as mud eh?

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01-23-2007 01:27 PM  10 years agoPost 6
dkshema

rrMaster

Cedar Rapids, IA

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You use the endpoint setting menu for the GEAR channel to set the gain. With the gear switch in one position, you have the ability to set heading hold gain from 0 to 100%. With the gear switch in the opposite position, you get the opportunity to set a Normal mode gain of 0 to 100%.

Start out with the endpoints for the gear channel set to 100%. Turn on your receiver and wait for the gyro to finish its power-up sequence. After about three seconds, the red LED on the gyro will either come on solid (good, this indicates HH mode), or may blink or stay off (bad, this indicates you didn't initialize in HH mode). You MUST initialize the gyro in HH/AVCS mode.

If the red LED comes on solid after you apply power and the gyro does its thing, note the position of the GEAR switch on your TX. This is the Heading hold position.

If the red LED DIDN'T come on solid after you applied power, the switch is in the Normal mode position. Flip it to its other position, and reapply power to the gyro. The red LED should now come on solid and this is the position of the switch to get into heading hold.

If you feel that that the switch is "upside down" or backwards for your taste, use the channel reverse feature in your 8103 to reverse the gear channel.

You now know which position of the switch sets the HH gain, and which position sets the Normal mode gain.

You have two endpoints in the gear menu to adjust. One will adjust HH gain, the other Normal mode gain. The little arrow will point at the endpoint number that's associated with the current switch position.

Now, it's a simple matter of picking a number between 0 and 100 for each gain setting. An endpoint setting number between 0 and 9 is the equivalent of 0% gain. An endpoint of 10 is 10% gain, and endpoint number of 90 is 100% gain. An endpoint number of 45 is 50% gain. Numbers greater than 90 don't do anything.

Look at your 401 manual, and the example called "Transmitter with ATV function (T9Z, FF8, FF7S, FF6S etc.)".

When you're done, make sure that you always apply power to the gyro with the switch in HH (AVCS) mode and let it initialize before moving the heli (about 3 seconds). The red LED on the gyro will come on solid and stay on. If it doesn't, your gain switch is in the wrong direction. Fix that, and reapply power.

Afterward, when you initialize in HH mode the red LED is on. Flip the gear switch, the red LED will go OFF and you're in Normal mode. Flip the switch back, the red LED comes back on and stays on.

Make sure that your rudder trim in EACH flight mode is the same. If the rudder trim setting is different between modes, when you change flight modes, you'll confuse the gyro and it will forget where neutral was when you applied power. Don't EVER use the rudder trim tab on your TX when operating in HH mode. Make sure revolution and acceleration mixing in your 8103 is dialed out or disabled for flight modes using HH in the gyro.

-----
Dave

* Making the World Better -- One Helicopter at a time! *

Team Heliproz

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01-23-2007 08:12 PM  10 years agoPost 7
AWittleWabbit

rrElite Veteran

O.C., CA

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Just a reminder, 70% travel will not be 70% gain when using ch 5 (gear) on the JR 8103. See my post

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01-23-2007 11:11 PM  10 years agoPost 8
dkshema

rrMaster

Cedar Rapids, IA

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An endpoint setting number between 0 and 9 is the equivalent of 0% gain. An endpoint of 10 is 10% gain, and endpoint number of 90 is 100% gain. An endpoint number of 45 is 50% gain. Numbers greater than 90 don't do anything.
That's why I included the above in my post. You'll have to be smart enough to interpolate the endpoint setting to get the gain you're after.

Dave

-----
Dave

* Making the World Better -- One Helicopter at a time! *

Team Heliproz

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01-24-2007 02:49 AM  10 years agoPost 9
AWittleWabbit

rrElite Veteran

O.C., CA

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dkshema

Drat, how did I miss that?

Well, I hope chopperscott posts back that he has it figured out now.

Heli-itis sufferer.

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