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HomeRC & PowerAircraftHelicopterRadio - Spektrum DSM › DX7 pitch not equal ???
04-01-2009 08:00 AM  9 years agoPost 1
col

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U.K. Ipswich.

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Just read the threads about the service menu on a dx7. and although i can find the info on how to get into it there isn't much info on how to cure specific problems.

my deal is that i get more -ve pitch from center stick to fully down,

than i get +ve pich from center up.

i know its not the models mech set up cos i'm ok with that.

on both models i get 0 mid stick, +10 top, -14 bottom.(at 60% swash mix) my fix for now is i have to start the pich curve at 12% which works but is a bit scruffy !

the other problem of course is when i want more than 10 at the top then i have to bring that 12% at the bottom up some more.

any help would be cool.

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04-01-2009 09:04 AM  9 years agoPost 2
TOSH

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UK.Peterborough

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Since when were you bothered about scruffy but here y` go
http://www.rcgroups.com/forums/showthread.php?t=609802

Flybars. Who needs `em.

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04-01-2009 09:53 AM  9 years agoPost 3
col

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U.K. Ipswich.

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Cheers tosh.
I had read that one but just not far enough. post 73 had the info i needed. i kinda glazed when it went from anything usefull to battery voltage.

just had a play and to be honest didn't notice any change on the model.

will try again tonight when properly hydrated not missing this weather ay.

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04-01-2009 10:09 PM  9 years agoPost 4
TOSH

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UK.Peterborough

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post 73 had the info i needed.
l knew you liked to read.

Flybars. Who needs `em.

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04-01-2009 10:15 PM  9 years agoPost 5
col

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U.K. Ipswich.

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pressed all the buttons.
all the beeps came out. but its made jack ****e difference. spose i will just have to live with it.

helis fly great, i was just bored and playing.

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04-01-2009 10:25 PM  9 years agoPost 6
TOSH

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UK.Peterborough

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helis fly great,
That`s not the attitude to take Col, l think it`s most likely that you badly need one of those mega £2000.00 transmitters. You must have a straight line pitch curve, l`ve read it some where.

Flybars. Who needs `em.

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04-01-2009 10:49 PM  9 years agoPost 7
col

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U.K. Ipswich.

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2k tx.
i'm beyond that kinda help i think maybe an Acoms is more than enough for me now.

what i really need is a 6 grand Z750. damn he should not have let me start that bad boy today.

are we off topic ??

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04-01-2009 11:08 PM  9 years agoPost 8
TOSH

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UK.Peterborough

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what i really need is a 6 grand Z750.
lf l knew what that was l bet l`d need one. lf it`ll up me carbon footprint l`m all for it, lets live for today and leave the kids to sort the mess out.

Flybars. Who needs `em.

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04-01-2009 11:28 PM  9 years agoPost 9
RappyTappy

rrProfessor

Traveling the USA

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Don't know what exact heli your running, but the angles of the mixing arms in the head make the difference. Depending on the design, usually the mixing arms in the head have to exactly at 90 degrees with 0 degrees of pitch. If its off, then the max + and - will be off. So basically the way I think about it is the small double link(on like Rex's and Raptors ect)adjust the mid stick pitch, but the mixing arm angle adjust the top and bottom pitch.

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04-02-2009 06:45 AM  9 years agoPost 10
mchammer

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California,USA

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^^^^+1 sound like rod lengths to swash are off to me.

Peace Through Superior Firepower!!!

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04-02-2009 08:20 AM  9 years agoPost 11
col

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U.K. Ipswich.

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Cheers guys.
ya know, thats exactly what i would say on reading my post.

heli's are 700n , 600n.

Thing is the heli's are correct. I changed from a 9xII last week to the dx7.

with the 9x the pitch was perfect linear.

The only odd thing i did notice in the swap of transmitters was that when i bound and powered up the DX7 the servos centered in a slightly different position.

i changed the servo arms around and so on to get everything lined up again, NO rods were changed and everything still remains at 90 and level at 0.

i thought of the recalibration mainly because it is a second hand set and i had to have some wiring fixed as the pervious owner put the case screws through a loom maybe after adjusting stick tension.

the repair was carried out by a dealer.

its not a show stopper, it just a little odd i think.

Tosh, Kawazaki Z 750. have a look at the 09 model. yummy.

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04-02-2009 08:52 AM  9 years agoPost 12
RappyTappy

rrProfessor

Traveling the USA

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With that history, then ya I would say its that radio if with another radio and the exact set up it was fine. For me, not having pitch equal on top or bottom can drive me mad when I'm trying to get it low and precise.

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04-02-2009 09:02 AM  9 years agoPost 13
col

rrVeteran

U.K. Ipswich.

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yeh, i know that.
i have it equal, i just as i said earlyier had to up the bottom end of the curve.

why i will stick with it is it has a good half inch less travel on the stick than my 9X so i can get top and botom without trapping my finger .

when the 9x sells i will get a new dx7 or se and see what difference it makes if any.

maybe if i could be bothered i should go and bind up to someone elses dx7 and see if its the same.

when i'm feeling less lazy

anyhow, no rain i'm going flying.

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04-03-2009 12:22 PM  9 years agoPost 14
TOSH

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UK.Peterborough

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Yo col

l took a look mate but l think my Lambretta mates would beat the crap out of me if l got one. lts Quadrophenia all the way down here.

Flybars. Who needs `em.

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04-03-2009 10:06 PM  9 years agoPost 15
col

rrVeteran

U.K. Ipswich.

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Jimmy.
got any blues.

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04-04-2009 05:09 AM  9 years agoPost 16
TOSH

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UK.Peterborough

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Flybars. Who needs `em.

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04-04-2009 08:36 AM  9 years agoPost 17
Paul Woodcock

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Dubai - United Arab Emirates

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Hi.

Check on the pitch curve page.

Set the values to 0,25,50,75,100.
Check on the input/output values. if you get 0/0 at low stick and 50/50 at mid stick and 100/100 at high stick, then the tx is transmitting the correct values.

I have had an issue on some Tx's that the mid stick (the little painted lines) didn't give 50/50.

The re-calibration sorted that out.....

If the Tx is transmitting correctly and the pitch is biased on the heli, it could be the servo geometry or the servo itself.

Regards
Paul

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04-04-2009 10:34 AM  9 years agoPost 18
col

rrVeteran

U.K. Ipswich.

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Hey hey
we might be onto something here.

with the painted line i am getting 59 which would explain why i'm having to chop 12% (give or take my eyeball, off the bottom)

could u run me through the re-calibration proc that u do cos i have tried the one mentioned earlyer.

chers
colin.

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04-04-2009 01:12 PM  9 years agoPost 19
Paul Woodcock

rrElite Veteran

Dubai - United Arab Emirates

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Hi col

The re-cal mentioned earlier is what i used.

When you get to the 'stick centre' page (3rd photo on the link), make sure the stick is actually in the centre before you push the 'clear' button.

The next screen is the end point calibration (4th photo). Use the 'select' key to move from stick to stick. On each stick, hold full travel and push the 'clear' key. do in each direction on each stick.

Remember to 'save' all the changes, like on photo 7.

Hope this helps.

Regards
Paul

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