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Old Dec 30, 2010, 05:18 AM
most exalted one
Canada, BC, Blind Bay
Joined Aug 2002
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Discussion
9.6 nimh tx pack with three wires

A friend ordered a TX pack for Hitec Eclipse from a shop. He got a 3 wire pack with red/black/white leads. All I can find is a nimh pack that is wired for a thermostat to cutoff at 70 Celsius to protect the pack. Is this common?? Why would a shop provide a 3 wire pack??
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Old Dec 30, 2010, 08:55 AM
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Staffs, UK
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That's normally just because they used standard 3-wire servo cable (the connector is the same). The white wire is generally not connected to anything at the battery end.

Steve
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Old Dec 30, 2010, 11:56 AM
"Unnecessary Necessity"
coriolan's Avatar
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Joined Sep 2006
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The Hitec Eclipse-7 doesn't use a servo type connector it the Tx (and will not accept one). This is the batterie connector for most modern Hitec Tx, it is polarized.
When I need packs for my radios I just order from :
http://www.batteriesamerica.com/newpage8.htm
Better price and they know their product!
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Old Dec 30, 2010, 04:14 PM
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Ah, forgot about that, I'm more used to the older Hitecs and Futabas.

So the normal reason why Tx batteries are supplied with 3-wire cables is because they use 3 pin servo-type connectors. But I have no idea why (or even how) they got 3 wires into a 2 pin connector .

Steve
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Old Dec 30, 2010, 04:54 PM
"Unnecessary Necessity"
coriolan's Avatar
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Quote:
Originally Posted by slipstick View Post
Ah, forgot about that, I'm more used to the older Hitecs and Futabas.

So the normal reason why Tx batteries are supplied with 3-wire cables is because they use 3 pin servo-type connectors. But I have no idea why (or even how) they got 3 wires into a 2 pin connector .

Steve
Older Futaba used a kind of similar plug, current Hitec uses the connector pictured. All modern Tx batteries have only two conductors even when they uses a servo-type plug (the signal wire is not soldered on the batterie side). The main problem with servo-type connectors is that it is possible to plug them in reverse if not carefull, even the Molex type Hitec can be pushed in the wrong way despite the key tab and fry the Tx (many treads about that in the Radio and DIY electronic forum )
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Old Dec 30, 2010, 04:58 PM
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They just used a bigger hammer I guess
I hear now and then, that some folks manage to force those plugs in bassakwards on the Hitecs. Gimme the standard servo plug for a battery connector in a transmitter any day
Pete
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Old Dec 30, 2010, 06:00 PM
most exalted one
Canada, BC, Blind Bay
Joined Aug 2002
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I didn't have all the info but it probably is a black universal plug with one wire not connected.
I'm one of the guys who after many many times of plugging in finally plugged the Hitec plug in backwards and had to send an Eclipse in. Not as hard as it looks, especially when the brain isn't working!
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Old Dec 30, 2010, 11:49 PM
"Unnecessary Necessity"
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Agreed, I put some red marker on the + side of the batterie plug and Tx socket on all my Hitec radios for when I want to fast charge them with a peak charger..
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Old Dec 31, 2010, 01:25 AM
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United States, CA, Bear Valley Springs
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Quote:
Originally Posted by coriolan View Post
The main problem with servo-type connectors is that it is possible to plug them in reverse if not carefull...
No damage would occur. The Tx just won't power up.

mw (2x 9C owner)
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Old Dec 31, 2010, 04:27 AM
most exalted one
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Originally Posted by Mark Wood View Post
No damage would occur. The Tx just won't power up.

mw (2x 9C owner)
Absolutely! That would be the advantage!
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Old Dec 31, 2010, 12:05 PM
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My 9C and 8FG both have the negative and signal pin in the transmitter connected in common.
If you have a pack with a universal plug without the tab, just plug it in any old way, it don't care
Pete
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Old Dec 31, 2010, 01:20 PM
"Unnecessary Necessity"
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That's the advantage or 3-pins connectors in that application or as servo connectors over a 2-pins set-up............Until you meet an older Airtronic plug with the center pin negative!
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Old Dec 31, 2010, 02:16 PM
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1 size fits all ?

We hope ?
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Old Dec 31, 2010, 03:03 PM
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Psst. I have a great deal for the New Year. Five like new, hardly ever flown Airtronics receivers for the old style plugs. But wait there's more, they're negative shift Airtronics receivers, that I flew with a 9C.
Yeah, that old style ATX stuff burned up a servo or two. I really should take them to recycling
Happy new Year to All
Pete

Gorgeous day here, just came in from a great last flight of 2010!
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