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HomeAircraftHelicopterRadio - Spektrum DSM › Tx battery voltage level depends on model select???
01-23-2010 11:34 PM  8 years agoPost 1
whoamis

rrVeteran

san francisco, ca

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When I bring up my DX7 selecting any of the first 3 models (the ones I fly or sim with), I see 10.5+ Volts, stable.

When I bring it up on model 4, 5, or 6 (haven't tried others), it briefly shows 9.8, then falls to 8.something.... after a short while it generally sounds the low battery alarm.

This is true even though I copied model 1 to model 4.

Anybody seen this sort of thing?

I just got a witness, to eliminate the possibility that I'm just going insane.

Jim

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01-23-2010 11:45 PM  8 years agoPost 2
Gyronut

rrProfessor

Martinsville In.

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I dont think the model selection has anything to do with it.

It does appear that your battery has seen better days and its time for a new one ..

I assume you are using a nicad or metal hydride..??

Rick

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01-24-2010 12:20 AM  8 years agoPost 3
Justin Stuart (RIP)

rrMaster

Plano, Texas

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Get yourself a lipo and solder two diodes into the positive lead to bring the voltage down to match the NiMH pack. You'll love it.

Avant RC
Scorpion Power Systems
Thunder Power RC
Kontronik Drives

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01-24-2010 01:53 AM  8 years agoPost 4
Zaneman007

rrElite Veteran

Texas - USA

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I agree with the first two posts.

Changing models has nothing to do with the battery voltage.

Placing two diodes in series on a lipo will approximate the voltage of a nicad or nimh pack, and it will keep going and going and going. You've seen the commercial.

Old Guys Rule!

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01-24-2010 01:57 AM  8 years agoPost 5
dos boss

rrApprentice

Broken Arrow, Oklahoma - USA

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True, I put one in mine and a friends radio today. I added a LED that comes on when I turn on the power switch so I won't accidently leave the radio on.



If you have to bend over more than once to pickup your Heli it was a bad landing

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01-24-2010 06:24 AM  8 years agoPost 6
whoamis

rrVeteran

san francisco, ca

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Yeah, I get the fact it makes no sense whatsoever.

It is, however, true. I have tested it forwards and backwards, and in random order. It's the damnest thing.

I put in a support request, and will probably try getting a new battery.

It has original stock battery now. Again, on specific models, the battery holds voltage and behaves as expected, over a reasonable period of time.

I'll let you know if I hear back, or if I swap in a new pack.

With respect to "upgrading" to a LiPo, if I would have said "different models show radically different voltage, I have a LiPo upgrade," I would expect the consensus would be that there was something wrong with my LiPo. My point being, when weird **** like this happens, it's nice having as few variables as possible.

Jim

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01-26-2010 02:08 AM  8 years agoPost 7
whoamis

rrVeteran

san francisco, ca

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Say, we have a winner from Another Forum. Superb diagnosis, and validated.

Check it out, unless this link is blocked.

http://helifreak.com/showthread.php...474#post1799474

Post #7 in that thread.

Thanks for your help and interest.
Jim

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HomeAircraftHelicopterRadio - Spektrum DSM › Tx battery voltage level depends on model select???
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