2.4 battery requirement

[harley6133]

Building a 94" Ziroli P-40. Installed the radio gear today. Using two JR Sport 4.8V 1500. When both are tested they test at 5.09 and 5.11 under load but when the system is turned on the Spectrum AR9000 receiver simply just flashing the lights (brown out). Any ideas on the batteries. An old shop battery work fine.:195:

[notorious_benny]

A couple of 2 cell A123's........

[jamesrxx951]

do you have your remote recievers hooked up. you need at least one remote hooked up to get the reciever to fully turn on. it should power up just fine on 5v. but i would switch to at least a 6v pack or a123's.

[3ddd]

one smart fly super reg and two fromeco 2 cell 2300's,light and voltage is adjustable

[Bunky F. Knuckle]

I noticed that as well, James..... If I didn't have my remote antenna plugged in, I wasn't able to operate servos. But once I plugged one of the 2 in, I was ok!!

Pertaining to the battery thing........ To me, 4.8V is a little sketchy..... I would go with 6V NiMH's before you have to invest in a couple of A123 packs with chargers. I lost a 40 sized combat airplane on a 4.8V pack, with my AR9000. :(

What pack is your "old shop pack"?

[harley6133]

The old pack is a Expert 2700 ni-mh, 4.8V. The problem with other batteries is a very small space. The P-40 is scaled up, full cockpit, full scale exhaust, operational cowl flaps, hidden flap actuator, elc. All this stuff was a great idea now that i am deep into it. I am really thinking it over again.

[weezle]

whatever u do, junk the 4.8v battery.

[drewbags]

+1 on the 6V, I wouldn't trust 4.8v on 2.4G whatever make.

[dick hanson]

It is NOT the "4.8 v" pack that is a problem
some packs especially old 6 volt NIMH packs(so common) which are a real problem.
Here is why:
The receiver only needs to see about 3.5 volts in order to function
It all depends on YOUR servo loads or type and number of servos and how hard they are working and IF you have some binding etc.,
There is no way for the mfgr to know what you are going to do with the receiver and which battery (old/ new /abused/ etc.), you may use for power
You are going to have to do some thinking plus have a little volt meter of some kind ,which you can plug somewhere into th rx -even thru a Y harness if necessary. I have on on board each model.

I use a EXPERT 4.8 volt or a EXPERT6 volt meter (EXRA500 and EXRA501)- it is a tiny strip of LCD elements which light up epending on the voltage the meter sees . You can read at a glance.
These are cheap, simple and bulletproof.
Basically you plug in th meter --start up the system and look at the meter
It should go to "full"reading with a fresh battery
Now move all servos and all one at a time and see if the meter drops
OR how much the meter drops
EXAMPLE - ifthe meter suddenly drops when a particular servo is activated - you may have a problem with that servo which is causing a heavy load
Fix it
Ideally the meter will drop down about one element as you stir all the functions on the tx.
IF the meter drops down into the red -you got a problem
either bad battery or bad wiring or a hot voltage reg - (I won't use voltage regs on anything othrr than little electric models.)
as the battery gradually drains - the full reading may go down one element when the systenm is switched on
this is normal - what is NOT normal is to have the reading drop a number of elements going from green to orange and red!!!
Load meter readings before flyingare of no real value
What YOU need to know is what the load is in actual operation

Avoid
old batteries
regulators of any kind except the new switching types.
Be sure you size these correctly for your pplication
as long as you can operate your servos under load and still stay above 3.5 volts at the rx ,the rx will function.
again trying to determine by brand or type or battery size or voltage ,which is proper , is a waste of time

You need to know IF the system works properly under load
It ain't rocket science .
Just a little edjewmacation will get things working .

[harley6133]

Thanks Dick. I'll get one of the meters and give it a try.