Heading Hold INOP with my DX7???

[PsychoPilot145]

I have so far thought this was a gyro issue, but it is looking like a DX7 issue... So the gyro gurus are saying. All I know is... I don't know. It does not work. I have been spending hours a day on this now for over a week.

I am a noob, so please don't speak too technical. :oops:

I have my radio setup like Jermo said to in his video. I even have the gain settings the same. I have the gear selected to gyro, and the gyro gain plugged into the gear channel.

I cannot get heading hold mode to activate on my gyro. If this is done by throwing the gear switch, nothing is happening. I am getting no indication that throwing this switch is making any output with the transmitter. Could the switch be disabled? If so, how do I enable the switch?

It's hard enough learning how to fly... It's real fun in normal rate. :shock:

How are you DX7 gurus toggling your HH mode on and off? What do I need to do to get mine to work. This is the last glitch in getting my bird set up. It is soooo close.

Thanks in advance. FWIW, the gyro is a CSM SL 720, on a T-600.

-Mark

[Danish Heliflyer]

Hi there..

Just got the DX7 also. And found out it is a litle different compared to other radios.
The only switch you can use in the DX7 is the Hold / Rudder D/R at the front right side. Go in to the Gyro menu and make sure you dont have selected AUTO but Rudder D/R. When you toggle the Hold / Rudder D/R switch you can see the ON/Off.
The Hold function can be assigned to another switch in the Hold Menu...

Orherwise you have done correctly by selcting Gyro under Gear menu...

Hope you understand my english spelling.... :smokin:

[PsychoPilot145]

OK, I reverted back to Rudder/DR. Still no luck on HH regardless of what switch I throw on the transmitter.

Now, this switch was my throttle hold. I moved that to my Aileron D/R switch. So... Still no luck. Toggling the rudder D/R hold switch does nothing. In fact, it just does not matter which switch I throw. Only the mode and throttle hold seem to do anything.

Thanks for the help so far. Since this did not work, I've put everything back. Trying to run off of the gear switch.

Jermo, are you out there??? :arggg: :bomb: HELP!!!! :?

I can't tell if the problem is with the radio, gyro, or both.

[Danal Estes]

Use the servo monitor screen on the 7. Do you see the gear channel moving when you throw the switch?

[PsychoPilot145]

No, the gear switch seems to do nothing.

[Danal Estes]

OK, that localizes it to tranny setup.

My exact gryo setup, note that I have a DX7 "heli" version, Mode 2 (USA), and prefer the gyro gain switch on the right side, so I use the switch physically labeled AUX2. I also prefer throttle hold be the "rightmost backmost" switch... Follow this exactly, then change as you prefer...

Gyro 3-wire connector in "RUDD" (CH4). Single yellow wire connector in "GEAR" (CH5).

In system menu (hold stuff at power up):
[INPUT SELECT]
AUX2 INH
GEAR AUX2

In regular menu:
[THRO HOLD]
SW: RUDD D/R

[TRAVEL ADJUST]
GEAR
+65
-60

The following two settings are default... just verify:
[SUB TRIM]
GEAR
0

[REVERSING SWITCH]
GEAR
NORM

Now, go to the servo monitor screen. Flip the AUX2 physical switch, you should see the gear channel (only) move. Then test with the heli... always power up with all switches up/back/away from you.

[PsychoPilot145]

Gyro 3-wire connector in "RUDD" (CH4). Single yellow wire connector in "GEAR" (CH5).

This is where I lost you. Remember, I am new. :)

I have my setup like the diagram I will post. Rudder to rudder, gain to gear. Is this what you want, or something different. I have three wire bundle plugs, I have to move one plug (all three wires) at a time.

Also, someone suggested I go back into the setup screen and change the gear setting from gyro to gear. This makes the gear switch work, and "appears" to make HH mode work also. Is this a good idea?

I could care less which switch my HH mode is. My throttle hold is the very top right front like yours.

Note; The diagram is not mine. Another Helifreak user drew it up. Thanks.

[Danal Estes]

Gyro 3-wire connector in "RUDD" (CH4). Single yellow wire connector in "GEAR" (CH5).

This is where I lost you. Remember, I am new. :)

I have my setup like the diagram I will post. Rudder to rudder, gain to gear. Is this what you want,YES! sorry, forgot you have a CSM, not Futaba GY... so forget about the yellow or single wire. You have it right, rudder to rudder, gain to gear. Diagram looks perfect. Also, someone suggested I go back into the setup screen and change the gear setting from gyro to gear. This makes the gear switch work, and "appears" to make HH mode work also. Is this a good idea?

I could care less which switch my HH mode is. My throttle hold is the very top right front like yours.

Note; The diagram is not mine. Another Helifreak user drew it up. Thanks.

You can modify the various screens to get the switches where you want them... I prefer the gyro gain to be somewhere on the right so that my left hand (thumb) is most able to deal with any yaw when switching.

So, for now, follow the above exactly. Then experiment to move switches, if you wish.

[PsychoPilot145]

OK, we're on to something! THANKS!!!

It is acting like it is wanting to work. When I switch to HH, it goes full deflection nose right. I barely move the stick left, and it moves full left, with the stick only moving a few mm. This is with the travel adjustments you gave me.

Looks like we are sooo close. It looks like I just need to tweak the HH now. It appears to want to work. Any more suggestions? :D

[fireup]

For the CSM gyros, Mode 0 is Rate mode and Mode 1 is HH mode (by default).

Mode 0 is in the upper range 0 to 100 and Mode 1 is the lower range 0 to -100 (opposite from Futaba).

You need to do a servo reverse on the Gear channel to be in the HH range if you're using the Gyro mode for gear. Otherwise you can also reconfigure the SL720 with a computer.

[PsychoPilot145]

You need to do a servo reverse on the Gear channel to be in the HH range if you're using the Gyro mode for gear. Otherwise you can also reconfigure the SL720 with a computer.

Not sure I am following you. The servo is moving in the correct direction now. It is just wanting to stay at full deflection in HH. If I reverse the servo, will that not make the rudder move the wrong direction?

Mode 0 and 1 are as you say. It's just when I put it into mode 1 (HH) the rudder goes full deflection right. It is perfectly normal in normal rate mode (0).

[DavidH]

Sounds like there is a rudder mix activated. That would cause the servo to go full deflection when in HH mode.

David

[peterob]

I think the gyro is trying to move the tail back to the position it was in when the gyro initialised. Moving the rudder stick left and right quickly a few times normally centers it again.

The tail pitch slider will act differently in heading hold. If you move the rudder stick, it won't center until the tail actually moves to match.

The most important thing is to check that the gyro is working in the right direction, i.e. countering the movement of the tail. If you move the tail (with no stick input), the slider should move in the opposite direction (if it's anything like the 450). Have a look at the Finless video if you're not sure.

[Danish Heliflyer]

You guys are getting something wrong... In HH it is normal the rudder goes full deflection eventhough you only give rudder a few mm. When it does this is becouse HH is searching to compensate, but there is no motion and it will give full deflection... Follow my description and it will work - Promise

The only thing is you haft to tjek that the gyro is giving correct deflection to the right side. If it doesnt, then you haft to reverse in the gyro...

The other way you can tjek is when in HH and it gives full deflection, flik the switch to normal (Out ) of HH hold, and the rudder will neutralize to center. If not in center, move the servo so you have the rudder at 90 deg. or center. Also make sure before you do that, is Gyro must be at zero before adjusting servo along the boom.

[PsychoPilot145]

You guys are getting something wrong... In HH it is normal the rudder goes full deflection eventhough you only give rudder a few mm. When it does this is becouse HH is searching to compensate, but there is no motion and it will give full deflection... Follow my description and it will work - Promise

Right and wrong... At least with mine. :D Well, you are right.. But my gyro was acting badly.

OK, it is working now. I was finally able to run quick setup properly, which has never been able to have been accomplished before. It looks like this cured the problem.

Danish, working properly, it does exactly what you say it should. Before though, it was going hard right and just staying there. Moot point now, because it seems to be working correctly.

Wish me luck. I'm going to go charge the receiver pack, then try a light on the skids check in the back yard. Last time I tried this I had the sense reversed and almost mated the rex with my BBQ pit. :shock: I'll be careful today. It ain't easy beeing a noobie. :wink:

Thanks for all of the help guys, I could not have done this without you.

[flingwing403]

just had the same issue and in talking with jermo i have come to realise its the way the dx7 works...if you have "gear" as your gain and its gyro thats selected under it in your menu...then in you gyro sens you set it to "auto" this does in fact DISSABLE the gear switch and moving it will affect nothing, from this point on the settings you chose in the gyro sens menu are what you work with.

so if the f.mode values on the right are all at 0 you will see the left side 0 blinking...raise that value to where you need it.

and no..you cant just flip a switch from HH back to standard.

if you wanted to go back to standard you would go back to the gyro sens menu and lower that initial "0" value back down below 50%.

hope that helps

THANKS AGAIN JERMO ;)

[PsychoPilot145]

just had the same issue and in talking with jermo i have come to realise its the way the dx7 works...if you have "gear" as your gain and its gyro thats selected under it in your menu...then in you gyro sens you set it to "auto" this does in fact DISSABLE the gear switch and moving it will affect nothing, from this point on the settings you chose in the gyro sens menu are what you work with.

That is exactly what WAS killing my HH. My switches on top of the TX were disabled. I took Danal's advice and set my gear to AUX2 and I now have a HH switch on the top right, in close proximity to the throttle hold. I don't have much hair left, and I was pulling it out for two weeks trying to figure out why my HH would not work...

I am the only one at my field with the switch on the right, but I agree with Danal, I like it there. It suits me just right.

[Danal Estes]

Correct. "Gyro AUTO" = Controled by flight mode (not a separate switch). Working as desinge.d

I agree with Psycho, I want the separate switch, and I want it on the opposite side to my rudder thumb!!

[Anubis328]

I used the Gear switch, and just set it up as gear. This enabled the switch to work, and I was able to use the same settings as my futaba with positive for HH and neg to turn it off.

You have to think backwards a little. Gear and Aux2 refer to the place on the receiver. If you select Gyro, it uses that auto option, or you can select Gear or Aux2, to select a switch to be thrown.

[valsalva]

Ok. I'm going to revive this thread with another question. With the setup that Danal gave, does the travel adj. become the means of increasing/decreasing the gain? I thought that the travel adj. only affects the rate, or speed at which the tail will turn. Can someone please clarify? Thanks.

[fireup]

Ok. I'm going to revive this thread with another question. With the setup that Danal gave, does the travel adj. become the means of increasing/decreasing the gain? I thought that the travel adj. only affects the rate, or speed at which the tail will turn. Can someone please clarify? Thanks.

Travel adj. on the rudder ch. affects the rate/speed of piros. Travel adj. on the gain channel (gear/aux2) affects the gain.

[TMoore]

It's normal with CSM gyros for them to move in one direction or another when in HH mode. The gyro is trying to initiate rotation so it can measure it.

I have 3 of the CSM's and they all do this.

TM

[valsalva]

Ok. I'm going to revive this thread with another question. With the setup that Danal gave, does the travel adj. become the means of increasing/decreasing the gain? I thought that the travel adj. only affects the rate, or speed at which the tail will turn. Can someone please clarify? Thanks.

Travel adj. on the rudder ch. affects the rate/speed of piros. Travel adj. on the gain channel (gear/aux2) affects the gain. Thanks fireup! I knew there was a simple answer!

[Danal Estes]

Perfect answer fireup!

[Jermo]

I think it's interesting you guys want to control the gyro with a switch other than the flight mode switch. Just another switch to hit. I'm trying it out and see no advantage to using gear to control it. You don't gain anything, in fact you lose functionality because you have to hit two switches now if you change gain in a different flight mode.
:dontknow