JR 1222 Powersafe Reciever

[crash-n-burn]

Hi I am building a 40 % carden Exrta 300 I have a power distribution question. I want to use the JR 1222 Power safe reciever and run 8 Hitec 7950HV servos off it. To my understanding this will work. Doesn't this reciever basically eleminate the need for a power expander system ?

2 servos per aileron ( 4 total )
2 for rudder
1 per elevator half

> Then throttle / Choke servo and maybe a smoke pump but not sure abotu that one.

[Vic3D]

Use the 1222. I dunno which one you want to use, but your title says 1222 and your post says 1221. The difference is that the 1222 has the two power busses with 14aug wire coming in. I would just use straight lipos or li-ions without regulators. Using the soft switch included with the 1222.

[crash-n-burn]

	Quote: Originally Posted by Vic3D
	Use the 1222. I dunno which one you want to use, but your title says 1222 and your post says 1221. The difference is that the 1222 has the two power busses with 14aug wire coming in. I would just use straight lipos or li-ions without regulators. Using the soft switch included with the 1222.

using the 1222 sorry

[Vic3D]

	Quote: Originally Posted by crash-n-burn
	using the 1222 sorry

Yup that's what I thought. Yes it eliminates the need for PowerBox/Expander. If you are using this receiver you obviously have a 12X so you can match everything from the TX.

[3D-Seth]

	Quote: Originally Posted by Vic3D
	Yup that's what I thought. Yes it eliminates the need for PowerBox/Expander. If you are using this receiver you obviously have a 12X so you can match everything from the TX.

Yes. You can't match your aileron servos with the receiver alone. You actually need the 12X with the balance feature to do that.

Seth

[dick hanson]

	Quote: Originally Posted by Vic3D
	Use the 1222. I dunno which one you want to use, but your title says 1222 and your post says 1221. The difference is that the 1222 has the two power busses with 14aug wire coming in. I would just use straight lipos or li-ions without regulators. Using the soft switch included with the 1222.

Tho the rx wil work with these batteries - many servos will NOT
Liions ,FWIW are NOT the same as LiPos or A123 cells in amperage delivery .
even tho you may have enough voltage -at rest- the servos can easily pull power down below minimums for stable rx operation.
Some servo setups use in 40%models are almost like a short circuit- as far as the battery is concerned
This is a case whre you really should test each servo setip -in the plane -with a volt meter -in the circuit.
use a small test battery to supply power when testing and watch for large voltage drops when each servo is cycled .
I use an old 6 volt NiMh--not fully charged - this will drop voltage drastically if any large load is encountered.
The A123 batteries I actually use for power -have a rather flat curve and do not show sudden drain peaks as easily
Many so called rx problems ar simply lousy servo serups which which cause high peak drain on the batteries.
A thorough test before using is well worth it on setups with multiple high power servos.

[dbcaster]

That is the setup I have been using in my 40% Dalton for a few months now. 1222 with two A123's and no regs. Simple and effective. I have been using a 922 and two A123's in my 35% for over a year now with no issues.

[crash-n-burn]

	Quote: Originally Posted by 3D-Seth
	Yes. You can't match your aileron servos with the receiver alone. You actually need the 12X with the balance feature to do that. Seth

I got the 12x the balance feature is very nice I used it on my 50cc extra. As far as batteries I have always used Li-ion but with the high amps the A123 can put out I was thinking it may be a better option when you have 8 high voltage servos connected through the receiver.

[crash-n-burn]

	Quote: Originally Posted by dbcaster
	That is the setup I have been using in my 40% Dalton for a few months now. 1222 with two A123's and no regs. Simple and effective. I have been using a 922 and two A123's in my 35% for over a year now with no issues.

Are you using switches on your Dalton or are you plugging in the batts each flight ? Also I was thinking that you could run a wolverine switch with 2 deans in and 2 deans / 1 JR out run the deans to the receiver and the JR to the engine ignition. Generally I am not a fan of mixing ignition and receiver power systems, probably I wont do it but it was just a thought .

[jamesrxx951]

with the the 922,1222 they have a built in fail safe switch. so you dont need to purchase any switches for the recievers.

[dbcaster]

Exactly

[W.W. Corrigan]

dbcaster,

Do you disconnect your batteries from the RX to charge? Can I run the balance taps to an external port to charge without disconnecting. The JR manual is mute on this issue?

Thanks, Steve

[dbcaster]

I charge my batteries at 6 amps so I do disconnect them when I charge. I would not want to put that much current through the small charge jacks. I believe the 1222 is like any fail safe switch setup in that it will put a very small load on the batteries when it is turned off. If the batteries are left plugged in they will discharge over time. I always disconnect my batteries at the end of the day.

[2walla]

	Quote: Originally Posted by dbcaster
	I charge my batteries at 6 amps so I do disconnect them when I charge. I would not want to put that much current through the small charge jacks. I believe the 1222 is like any fail safe switch setup in that it will put a very small load on the batteries when it is turned off. If the batteries are left plugged in they will discharge over time. I always disconnect my batteries at the end of the day.

Exactly.. THey will kill the battery if you leave them plugged in. I have been using the powersafe receivers on 2 a123 for a couple of years and they work great! A couple of them I didn't even use the soft switch on as I could just reach in and plug the batteries in before flying.

[W.W. Corrigan]

Thanks guys,

I think I'm slowly getting to the answers I need. Unfortunately this is a warbird that requires the wings to be removed to get to the batteries. I would plan to unplug at the end of the day and yeah I know you are limited in current if balance tap charging but as I stand around and BS quite a bit that shouldn't be a problem for me

Steve