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DX7 minimum safe transmitter voltage

meowsqueak

Senior Heliman

New Zealand

After I charge my TX battery (overnight) it shows around 11.5V. After about an hour or two it's down to about 10.0V.

What is the lowest I should allow it to drop to while remaining safe?

EDIT: also, is the charger that comes with the transmitter a 'peak charger' or is it just a dumb constant-low-current charger or even one on a timer? I want to know how long I should leave it on charge, and whether it's possible to over-charge.

03-27-2008 Over year old.
dkshema

rrMaster

Cedar Rapids, IA

It's truly amazing what you can find if you read the DX7 manual...

Page 102:
1. Check the battery voltage on both the transmitter and the receiver battery packs. Do not fly below 9.0V on the transmitter or below 4.7V on the receiver.
The charger is a simple, dumb, "wall-wart" charger. It is not a delta-peak charger, a constant current charger, or a constant voltage charger. It's output is a nominal 110 milliamps, a little less than a 0.1C charger, as the DX7 has a 1500 mah NiMh battery pack inside.

It doesn't know when to shut off, it's safe to leave it on for an extended period of time. It will do the job of charging the TX pack if you leave it plugged in overnight.


From page 10 of the DX7 manual:
It is imperative that you fully charge both the transmitter and the receiver battery packs prior to each flying session. To do so, using the included wall charger, leave the charger and batteries connected overnight(16 hours).

The charger supplied with this system is designed to recharge your batteries at a rate of 110mA for the transmitter and 110mA for the receiver battery pack.

-----
Dave

* Making the World Better -- One Helicopter at a time! *

Team Heliproz

03-27-2008 Over year old.
meowsqueak

Senior Heliman

New Zealand

Yes, I remember reading that in the manual three months ago, but I've been using the simulator (so power is drawn from USB cable) and hardly had to charge it so I had forgotten where I'd seen that "9.0V" thing. Only just started flying very recently.

Thanks for the info

03-27-2008 Over year old.
Dave M

Senior Heliman

Mi.

The radio soes not get power from the usb cable.... it uses the battery in the radio..it just lasts longer because it is not trasmitting at full power.

It's OK....It's not your fault !!!

03-27-2008 Over year old.
Sam2b

Elite Veteran

Seattle, WA

I agree with dkshema. If you should go all the way down to 9v the TX wills start beeping at ya too, but don't make it a habbit.

_Sam B_
Rep: ProgressiveRC | VoltMagic | Ecalc

03-27-2008 Over year old.
HOMEPAGE  
Pinecone

Key Veteran

Maryalnd

Actually it isn't tranmitting at all.

Terry
Blade CP Trex 450 SE
QJ EP8v2 EX Gaui Hurricane 550
Vibe 50 Bergen Intrepid Gasser

03-29-2008 Over year old.
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Radio - JR & Spektrum DSM

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DX7 minimum safe transmitter voltage

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