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HelicopterRadio - Spektrum DSM › Dx7 and lipo !
03-22-2009 03:29 PM  8 years agoPost 1
ginnz

rrApprentice

MB,Canada

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well, i bought a used Dx7 from BlBills here on RR, and received it in perfect condition. the battery in it was dead as the radio was on when it arrived.

so not wanting to wait for charging. i had a TP 2100 mAh 20C lipo kicking around, one of the silver ones. i clipped the old stock battery out and hooked the TP lipo up, and slid it in. it was the only 3S pack that would fit in the battery compartment, if SpeKtrum would have made the compartment 5mm wider, almost any of my 3S packs would have fit.

now i got power baby! what an easy mod!

ginnz.

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03-22-2009 04:33 PM  8 years agoPost 2
TOSH

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UK.Peterborough

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Get ready for the lipo haters.

Flybars. Who needs `em.

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03-22-2009 05:51 PM  8 years agoPost 3
ginnz

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MB,Canada

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ok. bring em on. I LOVE LIPO. :-)

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03-22-2009 06:35 PM  8 years agoPost 4
Micro-Maniac

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Pasco,Washington​Formerly: Captain​Chaos

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I'm using an old 15C 2100 pro-lite in mine - But the fit in the tray was so tight that it was bowing the pack so I ended up just cutting out the lower wall of the battery tray so theres plenty of room for it now - If you split the tx case you'll see there is a space between the battery tray and outer case that a hacksaw blade fits into perfectly for a nice guided cut

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03-22-2009 08:19 PM  8 years agoPost 5
cdrking

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Seattle

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Get ready for the lipo haters.
Spoken like a true LiPo fanatic.

Jeff

To hover is divine, the alternative is rather PLANE.

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03-22-2009 08:29 PM  8 years agoPost 6
dave75d

rrKey Veteran

Jacksonville, FL

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i love my lipos in the dx7. ive gone from charging every thursday night to fly friday, then recharging again saturday nite to fly sunday, now i charge january to fly through march.

ten grand in helis and all i can do is hover

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03-22-2009 11:30 PM  8 years agoPost 7
Avropilot

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Murfreesboro,​Tennessee

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Seriously, Anytime I tell someone about installing a lipo in the transmitter they all have this opinion of it's dangerous and so on. They knock something they know nothing about. I've had one in mine for over two years. How much proof do they need?

Waiting for parts

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03-22-2009 11:41 PM  8 years agoPost 8
dave75d

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Jacksonville, FL

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i'm proof right here! take it out to charge, and its never been an issue. if they were that bad, we shouldnt be flying with them either.

ten grand in helis and all i can do is hover

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03-22-2009 11:48 PM  8 years agoPost 9
cdrking

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Seattle

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You guys sure seem like you have to defend your TX LiPo's.

To hover is divine, the alternative is rather PLANE.

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03-23-2009 01:08 AM  8 years agoPost 10
9387ASH

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UK

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Unfortunately I have had to repair some sets that have had LiPo's in them. When a transistor blows due to the over-voltage, they burn a nice hole in the pcb !!

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03-23-2009 01:16 AM  8 years agoPost 11
Wingman77

rrProfessor

Pulaski Tennessee

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if you are going to put a 3s lipo on a tx you need a resister to drop the voltage about 1.5v. I realy want to put a lipo in my Dx7, when my ni-mh dies it will get a lipo.

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03-23-2009 01:25 AM  8 years agoPost 12
9387ASH

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UK

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Or a couple of diodes..

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03-23-2009 01:40 AM  8 years agoPost 13
Micro-Maniac

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Pasco,Washington​Formerly: Captain​Chaos

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Only about 1/2V - The battery fuel gauge is actually calibrated for 8 AA alkalines (8x1.5V=12V) which is why you never see it completely full when using a nihm pack which only reaches about 11.5V fully charged and usually quickly drifts down to around 10.8V

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03-23-2009 10:13 PM  8 years agoPost 14
fuhlemann

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Jackson, MI

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umm, i just ordered a lipo as well for my dx7 se. now i've read that you guys recommend resistors/diodes... any infos on that? don't want to kill my DX7 SE

florian

MSH Protos 6S
Next-D Rave 450 4S
Spektrum DX7

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03-23-2009 10:55 PM  8 years agoPost 15
TOSH

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UK.Peterborough

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Mine`s been running fine for wellover a year with no resistors/diodes

Flybars. Who needs `em.

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03-25-2009 02:40 PM  8 years agoPost 16
ginnz

rrApprentice

MB,Canada

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no resisters or diodes here either.....

and next, im thinking of putting an align glo-driver in the TX somewhere, with a white, or blue el wire around the perimeter of the screen, so i can light up the screen, ill have a switch on it to turn it on and off.and ill do the TX on LCD mod also when i do the backlight.

i really wish spektrum would have had a back lit lcd from the factory.....

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03-25-2009 04:47 PM  8 years agoPost 17
Micro-Maniac

rrElite Veteran

Pasco,Washington​Formerly: Captain​Chaos

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From my understanding the radio pulls about 180mah (DSM2 mode?)

So at Ni pack voltage this would equate to about 2.0W

A cartridge of Alkalines would be about 2.1W

And a Lipo would be about 2.2W

(Double for DSM1 mode?(4Watts?) - I do use DSM1 RXs too with no issues so people using only DSM2 RXs shouldn't even worry in the slightest IMO)

I find it a little hard to believe it can't handle just an extra .1-.2W from the extra 1/2-1V of a Lipo over Alkaline and Nickel unless I'm looking at this all wrong

I greatly respect 9387ASH's knowledge and advice but I find it difficult to believe the damage to these radios was caused just from using Lipos alone without additional user abuse of some sort or faulty component etc

I too have been running my DX7 for a year now on Lipo without a diode and really don't see enough reason to bother with one as I have yet to hear of anyone not working for Horizon report any damage caused from using a Lipo
People would definitely be on here warning "Lipo killed my TX" and we'd still have to weed out misplaced blame cases but here we are with no first-party claims at all at least that I've ever seen so I wouldn't sweat it too much

If one was really worried about it then I think a single diode would be plenty and 2 would be overkill - (BTW if you do use a diode then remember not to try to charge the pack through it - Either put the diode on the radio side of the battery plug and remove the battery to charge or charge via the balance leads)

Most people who recommend diodes compare to nominal or fully charged Nickel voltages rather than Alkaline voltage the system is calibrated to -
1-2V more vs Nickel sounds alarming if you don't actually calculate the wattage whereas who would give +1/2V vs Alkaline even a second thought?

http://www.runryder.com/helicopter/p2751049/
 

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03-25-2009 06:23 PM  8 years agoPost 18
Zaneman007

rrElite Veteran

Texas - USA

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Two diodes work nice with a lipo,

And no worries.

Old Guys Rule!

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03-25-2009 07:15 PM  8 years agoPost 19
Mike Fortin

rrElite Veteran

USA

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I have been using a lipo's in my DX7/SE for almost the past 2 years. I have never installed a diode and have never had any issues in the 2 radios.

Outrage offers a nice TX pack that's plug n' play.

Have Rotors, Will Fly!

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03-25-2009 10:29 PM  8 years agoPost 20
fuhlemann

rrApprentice

Jackson, MI

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http://cgi.ebay.com/ws/eBayISAPI.dl...em=250386034582

I received the above mentioned pack today, charged it, perfectly balanced and fits right away in the battery tray. and i must say it was really cheap

I've set my Battery-Warning to 9.8V. What about you?

florian

MSH Protos 6S
Next-D Rave 450 4S
Spektrum DX7

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HelicopterRadio - Spektrum DSM › Dx7 and lipo !
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