RE: Spektrum DX-7   
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All Forums >> Radios, Batteries, Clubhouse and more >> RC Radios, Transmitters, Receivers, Servos, gyros >> RE: Spektrum DX-7
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RE: Spektrum DX-7 - 9/28/2009 8:40 PM   
bruce88123


 

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From: Memphis, TN, USA
Status: offline 		If you had taken the time to actually read the material I referenced you would have seen that B and R are not used with the 7100. Now, go back to page 2 of http://www.spektrumrc.com/ProdInfo/Files/SPMAR7000UserGuide.pdf and read.

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RE: Spektrum DX-7 - 9/28/2009 9:17 PM   
alasdair



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Status: offline 		Humble apologies Bruce88123.

I read the right side of page 1 by mistake. I have read it all carefully this time.

I see now that A and L are the only ones I need to look at.
So A counts fades on the main Rx and L counts fades on the additional Rx

I notice that it says "An internal receiver is located on the main circuit board" so what I thought of as a pair is actually one single antenna.

I guess if you use the Flight Log on the 9000 Rx with 3 satelites it will count fades in all four registers?

Any idea why it sometimes shows 3 dashes and sometimes 3 zeros on b and r ???

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RE: Spektrum DX-7 - 9/28/2009 9:24 PM   
bruce88123


 

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Status: offline 		Can't answer that one. My apologies also for jumping on you.

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RE: Spektrum DX-7 - 9/29/2009 3:27 AM   
AWorrest


 

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-deleted- I didn't see the posts on this page.



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RE: Spektrum DX-7 - 9/29/2009 4:22 AM   
TexasSkyPilot



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From: San Antonio, TX, USA
Status: online 		I thought maybe there were allowances for extra receivers. Seems that might be the case?

Jim

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RE: Spektrum DX-7 - 10/2/2009 3:47 AM   
griesel


 

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From: Tucson, AZ, USA
Status: offline 		Most of the posts deal with receiver problems. There are some transmitter problems also.
1. I had a lock failure at about 700 ft. when I raised the transmitter to look at the timer.
I inexplicably rotated the transmitter about 45 degrees toward me such that the antenna
was mostly hidden from the plane. The plane was in a 30 degree left turn; turning from down wind
to up wind. It kept turning while the engine went to nuetral. It took a second to figure out what was
wrong and recovered when the transmitter was rotated and moved down to the normal position.
The receiver battery was 6 volt and freshly charged and normal when recharged that evening.
I know - my bad.

2. The next day a friend of mine - John's plane was 700 - 800 feet away turning on to down wind from take off
when lock was lost and it crashed. I was determined to find out the cause because about 60 percent of the fliers
at our club use DSM2 technology. I found the following potential problems.

A. His antenna was aligned straight from the transmitter and pointed at the plane, and from my radio engineer days,
this would be the worst possible orientation of the antenna. I bend the antenna straight up when I fly.
Question A: Some other people in my club say the best way is to point it straight down but I do not know how to do that.

B. The transmitter voltage was 10.2 Volts. Question B. Does anybody know if the transmitter power output tracks
with the battery voltage? Lower voltage equals lower output. I have never seen my transmitter below 11.0 volts
as I charge the stock battery the night before.

C. The problem was duplicated at 300 feet in a ground level test. Recovery was achieved when the antenna was
turned up. The planes fuselage was sitting on a pickup tailgate which might explain the difference from 700 feet to
300 feet. The lock dropped out on this transmitter at 110 feet on a normal range test with the antenna pointed up
and the voltage still at 10.2 volts. Possibly the transmitter has low output.

3. This part is about using LIPO's in your TX. Horizon does not recommend it due to the potential of damage to
the circuitry due to higher than normal voltage and higher than normal heat. This is a real concern as transistors
can "wear out", degrade and quit due to high heat and/or high voltage. The maximum voltage I saw on a stock
battery is 12.3 volts. One way to lower the voltage on a Lipo is to not fully charge it. I only charge transmitter Lipo's
using a 800 to 1000 mah setting which approximately ends up at 12.3 volts starting at about 11.0-11.2 volts.
I think LIpos will be the transmitter battery of choice as Hitec with their Aurora 9 is leading the way.

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RE: Spektrum DX-7 - 10/2/2009 4:35 AM   
TexasSkyPilot



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Status: online 		A couple of things here. First, LiPos and Tx's don't go well together, and a "few volts" more are a few too many. 11.6 or 11.7 is about as high as I've seen any standard Tx's charge to.

No telling what that has done to your circuitry. Your friend's may have been at 10.2 that day, but he could have had it much higher at another time and damaged the circuitry. As yours could have as well. I hate LiPos anyway and don't trust them in or on anything. You can have battery packs with NiMh as high as 2700 mAh's for your Txs, and you can fly through quite a few Plane batteries with one that big.

LiPos alone could be ALL the problems.

On the 2.4's, keeping the antenna bent and not straight is very important. The cone of silence is a real thing.

Why did you say "My bad" about having a freshly charged 6Volt battery on your Rx? That's perfect. Even a recharge. Unless it was a liPo.

What kind of RX were you running?

Jimbo

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RE: Spektrum DX-7 - 10/14/2009 8:40 PM   
fast_eddie70



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Status: offline 		I agree with Jim-Texas Sky Pilot - Lipos are not for Transmitters, Antenna orientation is very important and I never fly with my DX-7 lower than 10 volts and receivers never lower than 4 volts on (4 cell receiver) or 6 volts on (5 cell receiver)

I believe Spektrum recommends not flying with your Radio lower than 9 volts & 4 cell receiver no lower than 3.5 volts. I prefer using good quality batteries too. I have had my radio for several years now, 2+ years and I am still using the original battery. I will probably change it out next spring. Don’t trust a $10 battery to fly a $300+ plane or Heli. I run 6 volt batteries on all my Receivers / Planes

Link to the DX7 Manual..

http://spektrumrc.com/ProdInfo/Files/DX7_Manual.pdf


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RE: Spektrum DX-7 - 10/14/2009 10:55 PM   
TexasSkyPilot



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From: San Antonio, TX, USA
Status: online 		Fast_Eddie70,

Your Avatar is awesome. Talk about nose art. You know it's good when you want to take it out to dinner!

I get my TX batteries from Radical RC.com, Good prices, great stuff, I've never had a bad product from him and I buy a BUNCH. Dave will take care of you. Low shipping costs too, he doesn't make it up on the other end.

I went past two years and noticed the battery was dropping a little faster than before. For 40 or 50 bucks it wasn't worth the chance. I got one that is huge, like 2600 or 2700 or something like that, NiMh and I'm having great luck with it. The DX7's really do use up the juice! It hardly drops after flying a number of flights. It's a good feeling.


Jimbo

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~ J ~<br>It is ALWAYS harder to do the right thing. And it is ALWAYS worth it, no matter what. <br>Jim, AMA 543443 WACO Brotherhood #86, Clip-Wing Coupe Brotherhood #1

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RE: Spektrum DX-7 - 1/11/2010 11:57 PM   
dave de


 

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Status: offline 		Hi mike, I,m reading this over & over about aileron & elevator. I can get both my elevators to work, but their moving in opposite directions...(when I pull stick down, the elevator goes down) so I go to servo reverser & this makes only one work. I,m totally confused. I had it working once with dual rates, then one day at the field it would only work when i put the dual rate switch to #1 On # 0 again, only one side of elevator worked. Should I reset the radio & try again. I,m disapointed its sooo hard to figure out.

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RE: Spektrum DX-7 - 1/12/2010 12:33 AM   
BuschBarber


 

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From: Rochester, NY, USA
Status: online 		It appears you are mixing Dual Elevators by connecting Right Elevator to Ch3 and Left Elevator to Aux2 (Ch7). You need to go to the Reverse function and set the Servo Direction for both Ch3 and Ch7 so they are both going in the same direction. In Pmix, you set the percentage you want each channel to move. This can be a Positive or a Negative number, which will also affect the Servo Direction. In this case, you want both Elevator Halves to move in the same direction the same amount.

Dual Rates are a percentage of the Total Travel Volume. It is only a Positive number and affects both Up and Down, Right and Left, equally. Expo also affects both Up, Down, Right, and Left, equally. The Dual Rate Switch changes both Dual Rates and Expo at the same time.

When you set ATV or End Points, you have to set both the Up, Down, Right, and Left parameters. You must move the Stick, one direction at a time, hold it, and then change the value for ATV or End Points.

I have used Dual Ailerons , Dual Flaps, and Dual Elevators for years on all types of Computer Radios.

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Page:   <<   < prev  115 116 117 118 119 120 121 122 123 [124]
All Forums >> Radios, Batteries, Clubhouse and more >> RC Radios, Transmitters, Receivers, Servos, gyros >> RE: Spektrum DX-7
Page: <<   < prev  115 116 117 118 119 120 121 122 123 [124]





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