RE: Spektrum DX-7

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 - 12/1/2007 3:31:00 AM

alan0899

Posts: 2034
Joined: 4/17/2006
From: Cundletown, NSW, AUSTRALIA
Status: online

G'day Drew,
The voltage has to stay above about 3.2volts, with your battery under load, before you may have a problem, if it now takes 5 flights to drop below 5 volts, then don't fly more than 5 flights on a charge, because the batteries are flat at 5.5 volts for a 6 volt pack, ie, 5 cells at 1.1volts per cell, means it is flat at 5.5 volts, under load.
It matters not whether it is a Spektrum radio or any other, if you fly with flat batteries, you is gunna crash!!!!!
In other words, if it will fly ok with the radio you use now, it will still fly ok with the Spektrum, just don't fly after your batteries get below 5.5volts, UNDER LOAD.

_____________________________

Good Flyin Mate. Keep Thyne Airspeed up, lest the ground arise & smite thee, Allan.

(in reply to Canadian_Eh!)

Post #: 2576

RE: Spektrum DX-7 - 12/1/2007 3:43:10 AM

Flypaper 2

Posts: 4337
Joined: 3/29/2002
From: Kingston, ON, CANADA
Status: offline

I'm running the 4.8 volt batt. that came with the Spektrum in a 1/4 scale Corby Starlet with no problems. I get four flight till the batt. gets down to 5.2 volt at which time I recharge it. Probably a 100 flights with this system in this 15 yr. old girl.

_____________________________

Gord
Dreamed I was a muffler. Woke up exhausted.

(in reply to smooreace)

Post #: 2577

RE: Spektrum DX-7 - 12/1/2007 4:55:48 AM

Ed

Posts: 1792
Joined: 12/5/2001
From: Bemis, , USA
Status: offline

quote:

ORIGINAL: Canadian_Eh!

I have a 6.0 volt 1100mah nicad battery, with 1 HS-5645mg, 1 Hs 5625mg, and 2 DS821s, is this battery enough to adequately power the receiver (Ar7000) and the servos, as to insure the voltage does not drop below 4.8 volts ?

Great white frozen north, Drew

Yer know ........... The very best protection that you can provide yourself with, is to simply run a voltage check before each flight. You will soon develop a feel for how efficient your pack is. Take nothing for granted. With the new digital technologies, checking voltage before each flight is now more important then ever.

> Jim

(in reply to Canadian_Eh!)

Post #: 2578

RE: Spektrum DX-7 - 12/2/2007 3:14:18 AM

Canadian_Eh!

Posts: 27
Joined: 3/27/2005
From: Waterville, NS, CANADA
Status: offline

Okay mint, will do, im more anal retensive about it now then i was before, i flew a flight where my rudder stopped working, proceeded by laggy throttle, and by the time i got it down, i had no throttle or anything else. thanks for the advice, i was just wondering under load weather or not i would have an issue with the voltage dropping below 3.2 volts and loosing the plane, so now i think ill upgrade to the DX7. I had a chane to use one, in a pulse 40, and felt instantly connected id never experienced anything like it, and now that i have my yak, i want that feeling, because i know the lack of latency would open up faster rollers, snaps, walls, everything under the sun. thanks.

(in reply to Ed)

Post #: 2579

RE: Spektrum DX-7 - 12/2/2007 4:50:15 AM

Ed

Posts: 1792
Joined: 12/5/2001
From: Bemis, , USA
Status: offline

quote:

ORIGINAL: Canadian_Eh!

Im currently using 72 MHZ, and find it takes 5 flights before it drops below 5.0 volts, will this change if i use a AR7000 Receiver, thanks for any reply's.
Great white frozen north, Drew

If you just change to an AR-7000, and the other on board components stay the same, your flight times shouldn't change at all, but don't take that for granted. Always check between flights with a loaded voltmeter, and never ever take off at, or under 4.8 volts !

Your charge routine may change, your batteries will deteriorate with age, or a cell may short out during the previous flight.

> Jim

(in reply to Canadian_Eh!)

Post #: 2580

RE: Spektrum DX-7 - 12/12/2007 7:29:58 AM

Rfabbre

Posts: 186
Joined: 9/26/2004
From: Roseville, CA, USA
Status: offline

I just got a DX-7 for my 50cc Extra and I have a question for one of the experts---

Can you plug redundant batteries (2) into a y-harness and use a single channel for the batteries or should I put the Y-harness and the second battery on with one of the other servos?

The reason I think I need to do this is I have all the other channels used and I use a 2 wire switch harness so I have an extension coming from the battery input on the AR-7000 set up just for binding. Other channels are 1, throttle; 2, aileron; 3, Rt elevator; 4, rudder; 5, ignition kill; 6, battery; 7, Lt elevator.

Thanx Rich

(in reply to Ed)

Post #: 2581

RE: Spektrum DX-7 - 12/12/2007 7:44:37 AM

alan0899

Posts: 2034
Joined: 4/17/2006
From: Cundletown, NSW, AUSTRALIA
Status: online

quote:

ORIGINAL: Rfabbre

I just got a DX-7 for my 50cc Extra and I have a question for one of the experts---

Can you plug redundant batteries (2) into a y-harness and use a single channel for the batteries or should I put the Y-harness and the second battery on with one of the other servos?

The reason I think I need to do this is I have all the other channels used and I use a 2 wire switch harness so I have an extension coming from the battery input on the AR-7000 set up just for binding. Other channels are 1, throttle; 2, aileron; 3, Rt elevator; 4, rudder; 5, ignition kill; 6, battery; 7, Lt elevator.

Thanx Rich

G'day Rich,
You can power the RX from channel 6, I think that is the gear slot, while binding, using the bind/battery slot & bind plug, then unplug bind plug & plug 2nd switch into battery slot, & fly.
You only need to rebind, after changing throttle setups anyway.
Binding is not something you do very often.

< Message edited by alan0899 -- 12/12/2007 7:45:55 AM >

_____________________________

Good Flyin Mate. Keep Thyne Airspeed up, lest the ground arise & smite thee, Allan.

(in reply to Rfabbre)

Post #: 2582

RE: Spektrum DX-7 - 12/12/2007 2:54:50 PM

DadsToysBG

Posts: 1596
Joined: 7/31/2003
From: Bowling Green, KY, USA
Status: offline

It is best to use to separte batteries and switches. The second battery can plug into any port even if you use a Y-harness. Always use the Spektrum switch in the battery port so you can re-bind if needed. Dennis

_____________________________

Dads Toys. I fly what I sell
CD Vette City Big Bird

(in reply to alan0899)

Post #: 2583

RE: Spektrum DX-7 - 12/12/2007 3:18:11 PM

Zeeb

Posts: 1899
Joined: 11/11/2004
From: Pleasant Grove, UT, USA
Status: offline

quote:

ORIGINAL: Rfabbre

I just got a DX-7 for my 50cc Extra and I have a question for one of the experts---

Can you plug redundant batteries (2) into a y-harness and use a single channel for the batteries or should I put the Y-harness and the second battery on with one of the other servos?

The reason I think I need to do this is I have all the other channels used and I use a 2 wire switch harness so I have an extension coming from the battery input on the AR-7000 set up just for binding. Other channels are 1, throttle; 2, aileron; 3, Rt elevator; 4, rudder; 5, ignition kill; 6, battery; 7, Lt elevator.

Thanx Rich

Hmm....

Your question/setup has me wondering if you're aware of the power requirements the Spektrum has?

A two wire lead from your switch to the battery? I've never seen an HD lead that wasn't three wire, are you using a standard type switch rather than an HD? If so, you need to get rid of that and go for the heavier gauge wiring found in the HD switches and plug it into the Batt/Bind port of the rx. That will also allow you to bind from the charge port on the switch rather than having to monkey around with Y-harnesses or pulling/changing leads to bind.

You really are better off with two separate switches and leads to the rx as Dennis has noted. You can put a Y-harness in one of the servo ports if they're all full, or go head put the second battery lead into the port you're using now. The idea is that you increase the current (amperage) handling capability of the system as the max sustained throughput on the little connectors is about 3.5 to 4 amps. You also get redundant power supply that way.

You need to make sure that you've got low impedence (low internal resistance) batteries if you're going to use either NiCD or especially NiMH batteries as well. This assures adequate voltage to the rx when you put a significant load on the system with something like a snap roll.

The Spektrum systems are really great performers and I would not go back to my 72MHz stuff, but you do have to pay more attention to setting them up. Do some more reading/research on the threads that talk about power issues with the Spektrum, you'll find all sorts of advice/specifics about setting up a good clean power system. Virtually ALL of the problems I've seen people have with the Spektrum can be attributed to inadequate power supplies....

_____________________________

Zeeb

(in reply to Rfabbre)

Post #: 2584

RE: Spektrum DX-7 - 12/12/2007 5:40:20 PM

Rfabbre

Posts: 186
Joined: 9/26/2004
From: Roseville, CA, USA
Status: offline

Thanx for all the replies!

I am (for now at least) planning to use 2 MPi Maricle Switches (the ones with 6v regulators) and 2 cell lipos. This was the recommended setup from TroyBuilt Models. Upon closer inspection, I see that the switches do indeed have 3 wires. So, I think I will go with the elevators on a Y and just put the second battery in Aux 2.

Thank you all for the speedy, informative responses.

Rich

(in reply to Zeeb)

Post #: 2585

RE: Spektrum DX-7 - 12/12/2007 7:19:14 PM

onewasp

Posts: 1368
Joined: 12/11/2002
From: USA, USA
Status: offline

quote:

ORIGINAL: Rfabbre

Thanx for all the replies!

I am (for now at least) planning to use 2 MPi Maricle Switches (the ones with 6v regulators) and 2 cell lipos. This was the recommended setup from TroyBuilt Models. Upon closer inspection, I see that the switches do indeed have 3 wires. So, I think I will go with the elevators on a Y and just put the second battery in Aux 2.

Thank you all for the speedy, informative responses.

Rich

Leave the elevators alone and use the 'Y' to connect the Battery to the Rx.
There is a benefit to leaving the elevators alone----there is no loss or change by 'Y'ing the battery to the Rx----it is simply a bus bar set up.

< Message edited by onewasp -- 12/12/2007 7:22:11 PM >

_____________________________

The ground reached up and smote my airplane

(in reply to Rfabbre)

Post #: 2586

RE: Spektrum DX-7 - 12/12/2007 8:48:49 PM

Cambo

Posts: 1516
Joined: 6/20/2005
From: Phoenix, AZ, USA
Status: offline

Hi guys
I think Santa is bringing a DX7 package with an extra AR 6200 reciever . Anyway, I want to adress this low voltage cutoff problem that some people are having. I am especially seeing alot of these reports here at RCU. First, the AR 6200 is going in a 27% cap 233 that has 7 servos, 6 wich are high torque, metal gear, but not digital. Matchboxes make is possible for me to use 7 servos on a 6 channel setup. It has 2, 6v, 1400mah NIMH, 2/3A batteries with I think will do the job fine for the ar 6200. I have done as many as 10 flights an only dropped to 6.2v under a .5 amp load. That is no were near the 3.5V reboot so i am safe there.
However, my stinger 50 heli is what i am concerned about. I am expecting to take up every port with the ar7000. It is running all digi's with gov and 401. I only have one battery imput. The battery is connected to a heavy duty on/off switch via deans and the the switch goes into the reciever via 1 futaba J. Again, heavy duty wiring all around. I never do more than 3 flights before i recharge. Usually i recharge after every flight. My battery however is 4/5A 4.8V 2000mah NiMH. I usually put about 650 mah back in after 2 flights. Now, if i am reading this chart correctly, these cells maintain a voltage of around 1.15 percell at a 20amp discharge in my operating range of 800 mah. (http://www.cheapbatterypacks.com/ce...invid=ELITE2000)
To me this seems like a suficient power source but i am hearing about so many low voltage rebute problems with 4.8v packs. Just want to make sure that my logic is good here. 3.5V is SO low IMO but i could see a spike like that if you were doing hard 3d, wich i am not doing. Again, realistically i will peak off the battery after every flight. I would rather not switch to 6v on the heli because i will need a regulator for the gyro. Just hate complicating things.
Any thaughts?

< Message edited by Cambo -- 12/12/2007 8:49:19 PM >

(in reply to onewasp)

Post #: 2587

RE: Spektrum DX-7 - 12/12/2007 9:18:25 PM

DadsToysBG

Posts: 1596
Joined: 7/31/2003
From: Bowling Green, KY, USA
Status: offline

A 4.8 v battery will have 5.5 to 5.7 volts at full charge. When you see 4.9 to 5 volts with a 1 amp. load it's time to recharge. Dennis

_____________________________

Dads Toys. I fly what I sell
CD Vette City Big Bird

(in reply to Cambo)