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Chophop -> RE: 11.1v li-poly in Walkera transmitter? (7/23/2006 2:10:45 PM)
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You may want to look at getting a 10 cell AA holder for NIMH batteries, then devise a reliable way to attach it to the back of the TX. I read the TX draws 200 ma, so it should last near 10 hours of operation with the 2000ma AA NIMH's. Another alternative would be to get a 2 cell AA holder, attach it to the battery cover, make a series cable adapter to convert the 8 cell holder you have into a 10 cell. Make 2 notches in the cover, the 8 cell cable comes out, plugs into the series adapter, then back into the TX. It would be a good idea to glue or screw a little plastic box to slide the 2 cell holder into, with maybe a velcro strap to hold the 2 cell in the box. I am working on it.
I did some antenna in glitch testing and with 8 cells got occasional glitches, especially around large metal objects. Then I used a 12v regulated power supply that plugged into the charge port and got zero glitches. As a matter of fact, I set the DF 4 on my bench for hours with no glitches, but did not test very long with motors running.
The signal the receiver gets will fall off at this rate : double the distance and the received power falls by the square root. 25/2 = 12.5, the square root of 25 is 5. Better run it at 12 volts , and get all the power out of the tx you can, but don't exceed the 12v rating.
And don't use 10 AA cells other than the 1.2v NIMH or NICAD. Lithium or alkaline cells will exceed the 12 volts.
Stableblade
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